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Serving all of Nashville with over 30 years' experience

Questions about heating and
air conditioning?
 We've got easy-to-understand answers!

We believe the best customer is a well-informed customer.
It helps you sleep better at night - and that helps us sleep better!
That's why you'll find our website offers more
solid, useful information than all the other
heating-air conditioning websites in Nashville - combined.

How to tell if you've got ductwork problems
The ABC's of Heating & Air Conditioning

Heating

What are the different types of heating systems?

Big question. There are many different systems in place today to heat a home and any attempt to cover each system will result in a book on the subject.

To simplify things we will look at heating systems as a combination of two separate components, the distribution method and fuel. The different combinations of fuel and distribution systems make for the wide variety of systems on the market.

We have broken this question down into several sections, this way you can look at the area you want.

Distribution A quick review of the various distribution systems for central heating.

Fuel A quick review of the various fuel options for central heating.

Heating systems come in all sizes, types and fuels. In residential systems there are basically two different distribution systems, forced air (ductwork) and radiation (baseboards). These systems can be fueled by one or more of oil, electricity, natural gas, propane, solar or wood.

For an illustration of a common furnace layout, CLICK HERE or on the picture at the left.
To see a radiant heating layout, CLICK HERE or on the photo at the right.

For most purposes you can categorize home heating systems into two broad categories, furnaces and boilers.

Generally speaking furnaces heat air and use a system of fans and ductwork to move that air around the house.

Boilers heat water and use a circulator pump and piping to move the water through radiators, thus heating the home.

Furnaces

For an illustration of a common furnace layout, CLICK HERE or on the picture at the left.

Furnaces come in all shapes, sizes, efficiencies and fuels. The most common furnace in urban areas is a forced air, natural gas unit.

In rural areas, or areas that do not have access to natural gas pipelines, furnaces often burn oil, propane or electricity to produce heat.

Regardless of the fuel all residential furnaces work on the same principle. A fuel is burnt in a heat exchanger to produce heat. Air is then passed over the heat exchanger where it picks up heat, the air is then delivered to the house through a ductwork system.

Furnaces are often classified according to efficiencies. You'll often hear furnaces being referred to as Standard, Mid and High Efficient units. The efficiency is determined by the furnace's AFUE . 

A  Standard furnace is one whose AFUE is below 70%, a Mid Efficient furnace is one whose AFUE is between 71% and 82% and a High efficient furnace is one whose AFUE is above 90%.

If you are considering the purchase of a new furnace, do not go by the label the manufacturer has assigned, compare AFUE ratings.

When a furnace is installed in a basement it is considered an "Upflow" furnace, meaning the cooler air from the home enters the base of the furnace, and exits out the top of the furnace.

The furnace is connected to a series metal boxes and pipes, which is the ductwork. The very fist metal box on the top of the furnace is called the PLENUM. If you have air conditioning the evaporator coil is installed in this plenum.

If a furnace is installed on the main floor of a home and the heat comes from floor registers, it is a downflow furnace. In a downflow furnace the cool air from your home enters the furnace at the top and the warmed air exits at the bottom.

Is there anything special I need to do to get my heating system ready for winter?

Most heating systems are quite reliable and will provide you with quick, comfortable heat when you need it, providing you take good care of the system.

We recommend that you check out your furnace BEFORE the first cold night hits. If you have air conditioning you should shut it down and cover it for the winter.

(For more information on this see Getting Your Air Conditioner Ready For Winter under the Cooling FAQ section.)

Follow these easy steps:

  • Clean or change your furnace filter monthly - like when you get your gas or electric bill.

  • If your furnace or boiler has a pilot light, make sure it is on.

  • Some homes are equipped with a "FRESH AIR INTAKE" that brings in fresh air from the outside for combustion. If your home has one, make sure it is not blocked and clean the outside lint trap.

  • Set your furnace to the "heat" position and turn up the thermostat.

  • Allow your furnace to run through a couple of cycles to make sure it is working properly.

  • Do a quick visual inspection of the furnace area to make sure there are no items that could interfere with air flow or combustion.

  • Call Energy Masters at 352-3090 to arrange for a professional cleaning and inspection.

Is regular maintenance really necessary?

Absolutely! Your heating/air conditioning system is a finely tuned piece of machinery that is designed to squeeze the most heat and cooling from your energy dollars.

Your system operates for months on end and if one of the components of that system is not working in harmony with the rest of the system, you are losing efficiency and money.

Regular maintenance inspections often spot small problems before they become large, and very expensive repairs.

Regular maintenance can also spot dangerous operating conditions that could lead to production of carbon monoxide, which could be a potentially deadly situation.

When looking for a contractor to perform a maintenance inspection, make sure you know what you are getting.

A comprehensive maintenance and safety inspection takes time and should be performed with care. If your service technician is in and out in just minutes, you may not be getting a comprehensive inspection.

Energy Masters provides you with a checklist of the items performed.

What is an AFUE and how do furnace manufacturers compute it? Also, are furnace manufacturers allowed to rate their own furnace’s efficiency and heat output?   If not, who does this?

An AFUE (annual fuel utilization efficiency) rating is assigned to every furnace using a very complicated formula that takes into account many factors, such as fuel use, electricity use, and the fans used in the furnace.

Usually, the manufacturer assigns the AFUE rating and then the AGA (American Gas Association) inspects the furnace and applies the formula to ensure that it lives up to its assigned rating.

For more information about heating and air conditioning terms, go to our GLOSSARY.

How can I tell if the heat exchanger in my furnace has cracks?

You can’t. Most cracks in the heat exchanger occur in areas that are hidden away. Even if the cracked areas of the heat exchanger were visible, the cracks themselves are extremely difficult to detect by anyone without a trained, experienced eye.

What causes the cracks to form in a furnace’s heat exchanger?

In the normal course of furnace operation, the heat exchanger experiences repeated heating and cooling, which causes a corresponding expansion and contraction of the metal. Cracks will tend to form in areas of the heat exchanger that are weak, such as the areas that have been welded together at the factory.

More weak spots and holes will form as a result of corrosion. Corrosion of the heat exchanger often signifies problems with the exhaust venting. What happens is that water in the exhaust, which contains carbonic acid, cools too quickly and condenses out, draining back down the chimney and onto the heat exchanger where the acid eats away at the metal.

Corrosion can also be caused by the ammonia fumes from a nearby cat litter box (the litter box should be at least 15 feet away from the furnace).

What does CFM stand for?

CFM stands for cubic feet per minute, which is a measure of air flow. All air conditioning units have minimum CFM requirements which the furnace or air handler must provide for the air conditioner to function properly.

CFM values are also important in the sizing of air cleaning and ventilation equipment, as well as in calculations of the pressure inside your home.

How often should I change my filter?

If you have a standard disposable filter, once per month is a good rule of thumb.  Most people need a reminder for such a task, and we recommend that you replace your filter every time you get your utility bill.

Also, filters are made with different efficiencies and thickness, so consult a technician, when you get a chance, on how often you should clean or replace your filter.
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Does it damage my central system for me to close off sections of my house by closing the doors to the rooms?

Yes  If a Central HVAC system is designed properly, it will distribute air evenly throughout the entire house.  Shutting off rooms only "chokes" the system, by not allowing proper air distribution.
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Should I set my thermostat back during the day in order to save on my electric bill?

No  If you do not own a "programmable" thermostat, then this is a bad practice.  The time and energy that it takes for the system to "rebound" after you get home far out weighs the perceived savings. 

The difference in owning a programmable thermostat is that it tells the system when to come on in order for the system to "rebound" at it's highest efficiency and over a long period of time.
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Based on a home's square footage, is there a "rule of thumb" that can be used to determine the proper size of HVAC equipment?

Yes  On most residential applications, for every 550-600 sq. ft. of living space, one should figure approximately one ton of cooling.  Systems are available in 1/2 tons also.  Example:  A home has 2100 square feet @ 600 square feet per ton, it would need a 3 1/2 ton system.

 Warning: This is only what it states to be, A RULE OF THUMB.  In order to properly calculate a home's heating and cooling needs, a thorough evaluation of a home's energy efficiency needs to be completed.   This can be done for you at no cost by our Project Management Team.  Call 352-3090.
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Should I leave my fan in the "on" position or the "automatic" position?

It depends.  Depending on the humidity levels in your home, leaving your fan in the "on" position can be a way to constantly circulate air throughout the home and increase comfort levels.  It can, however, cause more wear on your fan motor.

In fact, some people open their windows in the spring and fall and turn their fan in the "on" position to bring outdoor fresh air throughout their home.  If however you keep your fan in the "automatic" position, it will only come on when the air or heat cycle is on.
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How important are brand names?

When looking for equipment you will be told that brand A is better than brand B. In some cases one brand will offer benefits that another brand does not.

Over the past couple of years one of the most common questions we get asked concerns a certain brand of unit that is usually sold at several hundred dollars less than other brands. Because this brand is not that well known most consumers are not aware of it, even though the company that makes it is now the second largest manufacturer in the United States.

Generally speaking most equipment is well made and differences are usually cosmetic. Where brands can really make a difference is after the installation. If you have a problem with the equipment, and for some reason it cannot be fixed at the contractor level, you need support from the manufacturer.

Most major manufacturers will have technical people, trouble shooters, that are available to the contractor and ultimately the consumer to diagnose and fix those problems that are a little out of the ordinary.
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What is the most common reason for furnace replacement

A cracked heat exchanger.
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Should I change fuel types?

This is something you might want to consider if you are installing a new furnace. Which fuel to choose? That's a question that needs to be asked in your local area. In some cases natural gas is less expensive than electricity, oil or propane, but not necessarily always.

Who do you ask? In a lot of cases the answer as to the best fuel will vary depending on who you ask. Your gas utility, electrical utility, oil supply company, and your propane supplier will all make convincing cases for their fuels.

You should look for an independent source for pricing information. What you need to do is compare the local costs for electricity, gas, oil, and propane. Some sources of information include:

  • Call Energy Master at 352-3090

  • Your city/county government

  • State department of energy

  • Energy Star

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How do I know what size of unit I need?

When you are buying a new air conditioner you may get confused about size. In some areas air conditioners were regularly oversized so contractors would not have to deal with complaints from consumers - complaints that were usually due to inadequate ductwork.

Contractors often over-size a new air conditioner for two reasons:

  • to allow for future  home or commercial expansion, which increases the square feet being heated and cooled. This can avoid a complete replacement of your heating/air conditioning unit to meet those expansion needs.

  • to prevent the unit from having to run at full capacity, which can cause it to prematurely heat up, wear out and burn out, just like always driving a car at full speed.
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How does a furnace work?

A furnace works by pulling air inside a heat exchanger, where it is warmed with a flame of natural gas, propane or fuel oil, or with heated electric coils.

A blower sends the warmed air through the house via metal ducts; it enters the room through a register or grill in the floor or wall. Indoor air is circulated continuously through the system, so a furnace filter is used to contain dust, pollen and other airborne particles.

An older home might have a boiler, fueled by natural gas, liquid propane or fuel oil.

A boiler works by heating water and circulating is through pipes to radiators, where it warms the surrounding air. Unlike a furnace, a boiler doesn't circulate air throughout the house, which is why the air in a boiler-heated home might seem "stuffier."

Electric Heat Pumps

Another home heating option is an electric heat pump. This unit works by moving existing heat from one area to another in one of three ways:

  • Air-to-air: An condenser absorbs heat from the outdoor air (even the coldest air contains some heat) and transfers it to an indoor heat exchanger inside the home. Indoor air is warmed in the heat exchanger and circulated throughout the home. During the summer, the process is reversed to cool and dehumidify the home.

  • Water-to-air: Instead of extracting heat from outside air, this type of pump absorbs heat from ground water or surface water, such as a farm pond.

  • Ground-to-air: Also known as a geothermal system, this type of heat pump uses underground loops to absorb heat from the earth. Geothermal systems are usually installed in newly-built homes, but can also be used in existing home.

One advantage of a heat pump is that it provides both heating and cooling capabilities in one unit. Electric heat pumps are usually supplemented with a backup system, such as radiant floor heaters or baseboard units (see below), in case of extended periods of extreme temperatures. Heat pumps also use filters to reduce airborne particles and keep the unit clean.

Electric Resistance Heating

Electric resistance heating, usually found in the form of baseboard heaters, was popular during the 1940s and 1950s, and is often used in multi-family dwelling like apartment houses.

A baseboard unit has an electric heating element encased in metal pipe. Air warmed by the heating unit rises to the top of the room, and cooler air is drawn into the bottom of the heater. Each unit has a separate thermostat to allow for different temperatures in each room.

Radiant Heating

Radiant heating is making a comeback in many new homes. Instead of circulating heat by moving the air in the room, a radiant system heats objects - including people.

The most common form is radiant floor heating, which uses electric cables or small tubes of hot water embedded in a concrete floor or under a tiled floor. During the height of its popularity during the '40s and 50s, radiant heating was also installed in wall or ceiling panels.

Homeowners in the Midwest usually use radiant heating as a supplement to a primary heating system. It's most often installed under the floor in uncarpeted areas such as kitchens, bathrooms, laundry rooms and garages.

For added luxury, radiant heating cables can be embedded in a driveway - no more shoveling!

How can I save more money on my heating/air conditioning expenses?

Central Air Conditioners

  • Set your thermostat at 78°F or higher. Each degree setting below 78°F will increase your energy consumption by approximately 8%.

  • Use bath and kitchen fans sparingly when the air conditioner is operating.

  • Inspect and clean both the indoor and outdoor coils. The indoor coil in your air conditioner acts as a magnet for dust because it is constantly wetted during the cooling season. Dirt build-up on the indoor coil is the single most common cause of poor efficiency. The outdoor coil must also be checked periodically for dirt build-up and cleaned if necessary.

  • Check the refrigerant charge. The circulating fluid in your air conditioner is a special refrigerant gas that is put in when the system is installed. If the system is overcharged or undercharged with refrigerant, it will not work properly. You probably need a service contractor to check the fluid and adjust it appropriately.

  • Reduce the cooling load by using cost-effective conservation measures. For example, effectively shade east and west windows. When possible, delay heat-generating activities, such as dishwashing, until the evening on hot days.

  • Over most of the cooling season, keep the house closed tight during the day. Don't let in unwanted heat and humidity. If practical, ventilate at night either naturally or with fans.

  • Try not to use a dehumidifier at the same time your air conditioner is operating. The dehumidifier will increase the cooling load and force the air conditioner to work harder.

Furnaces and boilers

A few simple tips can save you dollars...

  • Set your thermostat as low as is comfortable. Keep the temperature fairly constant, as frequent changes will utilize more energy by causing unnecessary cycling on and off. Setting back the temperature at night, however, is recommended.

  • Clean or replace furnace filters once a month or as needed. Oil-fired boilers should be professionally cleaned and tuned once a year. Gas-fired equipment needs to be checked every other year.

  • Clean warm-air registers, baseboard heaters, and radiators as needed; make sure they are not blocked by furniture, carpeting, or drapes.

  • Keep draperies and shades on south-facing windows open during the heating season to allow sunlight to enter your home; close them at night to reduce the chill you may feel from cold windows.

  • Close the door to an unoccupied room or area that is isolated from the rest of the house and turn down the thermostat or turn off the heat for that room or area.

  • Use kitchen, bath, and other ventilating fans wisely. Turn these fans off as soon as they are no longer needed. In about 1 hour, these fans can pull out a house-full of warmed or cooled air.They can also pull dangerous furnace combustion gasses into the house in some situations.

  • Check your ducts for air leaks. First look for sections that should be joined but have separated and then look for obvious holes.

  • Do not use duct tape to repair leaky ducts. Standard duct tape has been shown unreliable in sealing duct leaks. Various mastics or non-cloth-backed tapes are preferable.

Heat Pumps

For heat pumps with outdoor coils, the location of the outdoor unit may affect its efficiency.

Outdoor units should be protected from high winds, which can cause defrosting problems. You can strategically place a bush or a fence upwind of the coils to block the unit from high winds.

Proper operation of your heat pump will also save energy. Do not set back the heat pump's thermostat if it causes the backup heating to come on. Backup heating systems are usually more expensive to operate.

Continuous indoor fan operation can degrade heat pump performance unless a high-efficiency, variable-speed fan motor is used. Operate the system on the "auto" fan setting on the thermostat.

And like all heating and cooling systems, proper maintenance is key to efficient operation. Clean or change filters once a month or as needed, and maintain the system according to manufacturer's instructions.

Dirty filters, coils, and fans reduce airflow through the system. Reduced airflow decreases system performance and can damage your system's compressor. Clean and lubricate the fan motor annually to ensure the required airflow is provided for proper operation.

The fan speed should be checked at the same time. Incorrect pulley settings, loose fan belts, or incorrect motor speeds can all contribute to poor performance.
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Air Conditioning

Why you should read your utility bills

No one wants to replace their aging air conditioner unless they have to—somehow, picking out a new air conditioner is just not as exciting as shopping for a new car.

But sooner or later, for the sake of your sky-rocketing utility bills, it has to be done. If you have not yet read the information at the beginning of this guide, please do so before proceeding.

Because the modern heating/air conditioning unit is often a single, well-tuned machine, many of the questions and answers in the heating category also apply to air conditioning.
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What are common things that go wrong with air conditioners?

If your air conditioner isn't working, first check the circuit breaker or fuse that serves the unit.

Change the fuse or reset the circuit breaker if necessary. If the compressor turns off and won't come back on during a very hot day, the unit may have built up a high head pressure and the high-pressure limit switch may have tripped. This switch is usually located right inside the access panel on the compressor unit. Simply push the button to return it to operation.

If the air conditioner doesn't cool or isn't cooling effectively, check the thermostat to make sure it is set to "cool" rather than "heat." Dirty evaporator or  coils or a dirty filter in the air handler or furnace also can keep air conditioners from cooling effectively.

Also, if you operate the air conditioner when the air temperature is below 60°F, you might find frost on the evaporator coils. If you do, it's time to turn off your air conditioner.
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Is there any maintenance you can do yourself?

Most of our customers prefer to take advantage of our low-cost Fall and Spring Maintenance Tune-ups. Our prices are lower than most others and it helps you avoid getting in over your head and possibly damaging your heating/air conditioning unit.

Keeping your air conditioner clean is the key to efficient cooling. Check the filter in the air handler once a month while it is in use and replace or clean the filter as necessary. Check to be sure that the condensate drain is clear (and the condensate pump is working properly if it has one) and that the condenser and evaporator coils are clean.

Keeping the components clean helps prevent common problems.

To clean the filter, remove it from the furnace or air handler (it's usually located inside or very near the air inlet). Replace disposable filters or clean reusable filters according to the manufacturer's directions.

Clean evaporator or condenser coils by removing access panels and brushing or vacuuming the coils—or use a garden sprayer filled with a mixture of water and detergent and spray from the inside out (be careful not to spray the electrical components). Rinse with a hose (again—avoid the electrical parts).

Be careful not to bend the fins or damage the coils. While cleaning the evaporator, check that the condenser drain is clean. If you accidentally bend fins, you can buy a comb made for straightening them at an appliance parts store.

Cleaning the blower's fan blades will keep your air conditioner operating quietly. Tighten the mounting bolts and lubricate any oil cups according to the manufacturer's directions.

You should refer serious air conditioner problems to trained technicians.
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When to Call for Help
 Call a technician if you have a defective condenser or any problems with the refrigeration system—this is a closed system that you should not work on.

Repair or replace: How to decide when it is time for a new air conditioner 

Repairing the damaged or worn-out parts of an air conditioner is not necessarily more economical than replacing the whole air conditioning unit with a new one.

For example, the compressor is the heart of any central air conditioner or heat pump. If the compressor fails, it must be replaced, usually at a cost that is equal to about 50% of the cost of a brand new air conditioner.

In most cases, when the compressor goes, it is more economical to replace the whole air conditioner. (Besides, if your air conditioner is 10 years old or more, it is only a matter of time before other parts begin to wear out as well.)

Air conditioning technology is changing to produce increasingly energy efficient and environmentally friendly units, so if you're not sure whether to replace your older unit, take a look at your utility bills.
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A word about brand names

When you shop for new cooling equipment, you may be told that Brand A is better than Brand B. In some cases, one brand will offer benefits that another brand does not.

Over the past couple of years, the most question we have most commonly been asked concerns a certain air conditioning brand which is usually sold at several hundred dollars less than other brands.

Most homeowners are not aware of this brand, even though the company that manufactures it is now the second largest manufacturer of air conditioners in the United States. The point is, even if the brand of the air conditioner is not one you have ever heard of, it is probably still a good unit.

Generally speaking, today most air conditioners are well made and the differences between brands are usually cosmetic.

Where the brand can make a difference is if, after the installation, you have a problem with the equipment and for some reason it cannot be fixed by a contractor (such as a minor defect). In this sort of case, manufacturer support is helpful.

Most major manufacturers will have technical people— trouble shooters—who are available to the contractor (and ultimately, to the homeowner) to diagnose and fix those problems that are a little out of the ordinary.
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Financing

I am a Senior Citizen living on a fixed income. How can I afford to buy a new heating/air conditioning unit even if I know I need one?

We offer a special Senior Citizen Discount. In addition, we work with TVA and other energy suppliers to help you arrange the financing you need.
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Do you accept credit cards?

Yes, we accept Visa, MasterCard, American Express and Discover.
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Do you offer any other financing options?

In addition to the Senior Citizen Discounts, if applicable, we provide zero-down financing with 6 months same as cash. If you have any questions about whether you can afford repairs or a new unit, please call us at 352-3090 and we'll be happy to work with you.
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Guarantees

What if I'm not satisfied with your work?

We offer a full 100% satisfaction guarantee - in writing. And we stand behind it. Our best customers are satisfied customers. If you're not happy, we're not happy. And we have lots of happy customers!
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How do I know you're a legitimate company?

We are fully licensed (Business License #15260 and Mechanical License #29), bonded and insured with all current federal, state and local licenses. Our company is managed by two certified professionals with more than 42 years' combined experience in heating/air conditioning repair and installation.

We are fully bonded by CPW Insurance and insured up to commercial liability limits as required by TVA, Nashville Gas and the Metro Nashville Department of Codes.

As a member of the TVA Certified Heat Pumps Program since 1985, we undergo continuous scrutiny and must meet exacting federal standards.

Nobody - but nobody - does heating and air conditioning better!
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What kind of warranty is there on parts?

We offer a 10-year warranty on parts and labor for any new installation. We also offer a full 30-day warranty on all repair work. If you have a problem, call us immediately.
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Service

What happens if my furnace or air conditioner breaks down in the middle of the night?

We're just a phone call away - 24 hours a day, 7 days a week. Call 352-3090.
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Do you provide free estimates?

Yes, we do - on all new installation, change-outs and repairs over $500.
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I don't even know what brand I currently have? Can you fix it?

If you don't know what brand unit you have, call us and we'll be glad to come out and take a look and get you up and running quickly.

We can repair any brand of heating/air conditioning unit you may own. We work closely with all major manufacturers to keep up-to-date with the latest technical and repair information. In addition, we have a hotline directly to the manufacturers if we need additional help.
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Other

General Information

One of the most important investments in your home that you'll ever make is an improvement in your heating, cooling, and indoor air quality systems. These systems are vital to your family's comfort and health.

Although it is not glamorous, good home comfort equipment that is correctly installed can increase the value of your home, lower utility bills, prevent costly repair bills, and can even improve some health problems. 

Whether you are shopping for a furnace, air conditioner, or air cleaning product, you need to do a little homework first.

For example, if you need a new furnace, you should consider the type of fuel you'll use, efficiency levels, accessory equipment (such as a power humidifier), and your household's particular needs.

This section will help you to get through the process of deciding what you really need so that you can make purchase decisions with confidence. Energy Master professionals will work with you to make the most efficient, cost-effective decisions.
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How To Shop For Home Comfort Equipment

The number one rule of shopping for home comfort equipment is to shop for the contractor first and then the equipment. Even the best piece of equipment can be next to useless if not installed correctly.  

A new furnace or air conditioner is not like a new washer or microwave. You can't just take it out of the box and plug it in.

Your new equipment must work with any other home comfort equipment already in place, as well as other systems in your home, such as  the electrical system, ductwork, radiators, ventilators, and even the plumbing.

Any problems in one or more of these systems could drastically affect the installation and operation of your equipment.

For example, if you purchase a new air conditioner, your pre-existing furnace must be able to handle the air conditioner's air flow requirements or there will be trouble. A good HVAC contractor will know what factors to consider and how to harmonize new equipment with your home's particular systems.
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Where can I find more energy information?

These sources were used for the information you've just read. FOr more extensive information, you can go to the sources: 

U.S. Department of Energy
Energy Efficiency and Renewable Energy Network
Your comprehensive resource for DOE's energy efficiency and renewable energy information with access to over 80,000 documents.
http://www.eren.doe.gov/buildings/

United States Environmental Protection Agency
Single copies of the entire Indoor Air Quality booklet are available from:
EPA's IAQ Information Clearinghouse
(800) 438-4318; (703) 356-4020
P.O. Box 37133
Washington, DC, 20013-7133.
http://www.epa.gov/iaq/pubs/insidest.html

EPA
Contributed to Duct Cleaning
http://www.epa.gov

also referenced are:
ACDoctor.com
Choosing a Heating and Cooling Contractor
 http://www.epa.gov/appdstar/hvac/contractors.html

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Our Privacy Policy

Under no circumstances do we sell, give, loan or rent your name, e-mail address or any other private information you may give us. Any such information you provide to us by e-mail or by phone is used strictly to service your heating and air conditioning needs.

We use "cookies" on this site only to collect anonymous information that helps us provide a better, more user-friendly website that serves your needs.

These "cookies" gather information about whether you use a Mac or PC, the type of browser you use and such things as the date and time of day you visit our site. We have no way of gathering private information, nor do we wish to.
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