Complete Heating and Air-Conditioning Repair and Installation

Here at ADI Heating and Air Conditioning we specialize in all aspects of home heating and cooling systems. From furnace and heat pump repair and installation, to hot water heating systems run gas or propane. We service all major brands and have over 25 years of experience working right here in the Washington DC area. When the time comes to replace, we specialize specifically in high-efficiency units and work closely with each client in determining exactly which is right for their home.

We are one of the region’s leading providers of emerging and super-efficient heating and cooling solutions as well, ranging from geo-thermal to duel fuel and beyond. In addition to furnaces, heat pumps, and boilers we specialize in:

Ductless Air-Conditioning and Heat Pumps

Most commonly used in remodeling or similar environments where sufficient room for ductwork does not exist, we can expertly integrate heating and cooling into even the tightest spaces. Ductless systems are flexible, and offer anywhere from one to four zones of heating and cooling coverage. Need some heat and air conditioning for the garage? We offer several types of ductless units great there as well. For a free estimate or to discuss our Ductless solutions in greater detail just give us a ring at 301.774.4200.


Geo-Thermal Heating and Cooling Systems

Increasingly popular, Geothermal heating and cooling uses the earth’s renewable energy to save you up 60% on your energy bills along with comfortable and even temperatures all year long. If you’re building a new home or would like to get a geothermal unit retrofit to your current one we can help. Be sure to discuss the 30% tax credit available on many qualifying applications with your tax advisor as well.

Interested in learning more? Allow us to take you on a tour of the benefits:


Whether you’re concerned about the high cost of fuel oil or you’re interested in the more eco-friendly performance of gas furnaces, oil-to-gas furnace conversion may be just right for your home. We’re more than happy to discuss your options and provide a free conversion estimate if you’d like to discuss the energy-efficient performance, lower emissions, and lower heating costs of a gas furnace.

Why Consider an Oil to Gas Conversion?

At today’s fuel oil rates, it costs approximately one dollar less to produce one therm (a commercial heating unit, equal to 100,000 Btus) with natural gas than with oil. That may not sound like much, but over the course of a chilly fall and winter, it can really add up. As a result, converting from oil to gas for your heating needs can literally save hundreds of dollars per year.

Cut Emissions with Oil to Gas Conversion:

Gas burns cleaner than fuel oil, making natural gas-burning furnaces both low maintenance and eco-friendly. Natural gas is among the cleanest burning of the fossil fuels, emitting primarily carbon dioxide and water vapor when burned. It does release some carbon monoxide, sulfur dioxide, and nitrogen oxides, but in much smaller concentrations than oil and coal, and creates almost no soot or ash. When you convert your furnace or boiler to natural gas, you’ll dramatically reduce your pollution emissions (and lower your impact on the environment) as well as practically eliminate the need for regular furnace cleanings!

Depending on the furnace or boiler system you already have in place, your oil to gas conversion from  Our professionals can help you select the best gas furnace or boiler option for your home or commercial property as well as provide expert installation workmanship. We’ll put our decades of experience to work for you, ensuring you get the quality workmanship and top-notch results you deserve. If you’re ready to get superior heating performance, start saving money, and reduce your environmental impact all at the same time,


Propane heating and cooling technology offers a cost-effective, energy-efficient alternative to traditional heating, cooling, and humidity control systems. Propane is the most universal of residential fuels and has the ability to power a wide range of appliances and equipment from a single fuel source. In addition to being safe, propane is also eco-friendly, meeting all of the EPA clean air energy standards.

Propane is versatile and can power a wide range of systems:

• Central Heating

• Hot Water

• Space Heaters

• Pool Heaters

• Duel Fuel

If you’ve been considering a switch to propane, or would like a propane system installed in a new construction environment, we’d be happy to help. To get started or for more information please contact us here.

Duel Fuel

How Dual Fuel Systems Save You Money

In mild outdoor conditions, heat pumps use the available outdoor warmth and bring it inside efficiently. As the weather gets colder, gas or oil furnaces are the most comfortable and efficient way to heat your home. So, combining an electric heat pump and a gas or oil (also known as “fossil fuel”) furnace is the smart solution for both comfort and energy savings. This combination gives you the maximum savings on both heating and cooling while providing you with ideal indoor comfort. Best of all, the System is programmed to monitor outdoor temperatures and switch automatically between electric power and fossil fuel. You are always heating and cooling with the most efficient fuel source—for comfort with confidence!

Indoor Air Quality

Maintaining your heating and cooling systems and being comfortable in your home year-round is certainly important, but perhaps no area of our business has attracted more interest in the last several years than our indoor air quality expertise. Certainly allergy sufferers in the home, or the needs of an aging parent have always raised the issue, but now, more than ever, we’re finding homeowners who just want the peace-of-mind and daily health benefits of an optimized living space.

The optimal solution for your home will depend very specifically on the issues currently plaguing its living space, but in general terms our installations and services surround four primary areas:

Whole Home Humidifiers:

As the name suggest, a whole home humidifier adds much needed moisture and comfort to the air in your home, and particularly in the wintertime where it helpstoreduce dry throat and itchy skin. The balanced humidity it creates also helps to keep furniture from drying out and improves your overall energy efficiency.

How can a whole house humidifier reduce your energy bills? Simply by making a lower thermostat setting feel warmer than it is. That’s right, humidified air feels warmer than dry air, even at a lower temperature setting. For example, a temperature of 69 degrees at 35% relative humidity feels just as warm as 72 degrees with a relative humidity of 19%. Setting your thermostat back by even 3 degrees can reduce annual heating costs up to 5% and over time that adds up big.

If you have questions, or would like help in determining whether your home needs a bump in humidity, feel free to contact us.

Whole Home DeHumidifiers:

We’ve addressed the issue of too little moisture in a home, but what if your problem is the opposite and you’re fighting excess moisture at every turn. Here, a whole home dehumidifier is your answer. Installed as part of your home’s heating and cooling system, a central dehumidifier works in conjunction with your air conditioner to pull air from every room in your home through the return ducts. It then removes the moisture and sends dry air back while balancing humidity levels in your home. On cooler days, when use of the air-conditioner is not needed, the system can also run independently.

What Are Signs You May Need A Whole-House Dehumidifier?

How will you know if your home could benefit from a whole-house dehumidifier? Ask yourself the following:

• Do you have trouble sleeping at night due to clammy skin or stuffiness in the air?

• Have you ever reduced the temperature setting because you’re uncomfortable with the stuffy feeling?

• Have your floors or other surfaces ever felt sticky or “sweaty”?

• Are you concerned with mold and mildew growth in your home?

• Do you have musty odors or smells in any area of your home?

• Do you have condensation on your water pipes?

• Have you seen wet stains on walls or ceilings?

• Do you or a family member have allergies (over-moist air can encourage the growth of mold, bacteria, and dust mites—three commonly known household allergens).

If you answered yes to any of the above questions you may have a moisture problem in your home that needs attention. To discuss the specifics of your home give us a call at 301.774.4200 or contact us here.

Whole Home Air Cleaners:

From pollen, dust, and pet hair to dust mites and tobacco smoke, left untreated the air in your home traps irritants that wreak havoc on your indoor air quality. To make matters worse, today’s weather-tight homes and windows trap even more of these contaminants inside where they’re most harmful. The result is indoor air that can be up to five times more polluted than the air outdoors.

An electronic air cleaner can remove up to 99% of these airborne impurities – a full 20 times more than a standard furnace filter.

First used primarily in homes with asthma and allergy sufferers, we now find interest in whole house air cleaners from health conscious families all throughout the Washington DC area.

If you’d like to learn more we’d be happy to discuss your home in more detail. You can give us a call directly at 301.774.4200 or contact us via e-mail here. If you’d like to arrange duct cleaning to further assist with your indoor air quality we recommend Y & Y Natural Cleaning of Montgomery County.

Whole Home Ventilation Systems:

The installation of a whole house ventilation system is a way to trade stale indoor air for fresh air all year round. As noted above, energy-efficient windows and doors, as well as thicker insulation and air tight vapor barriers in newer homes, all have the unfortunate by-product of making it nearly impossible for houses to “breathe”. This breathing is what expels stale polluted indoor air and exchanges it for cleaner, fresher, outdoor air.

If too little outdoor air enters a home pollutants can accumulate to levels that may pose health and comfort problems.  Opening windows and doors is one solution, but cold or foul weather often prevents this.  A whole house ventilation system addresses this issue by ventilating a home’s stale, polluted indoor air with fresh air in an energy-efficient and safe way 365 days a year.

Want to learn more? Feel free to contact us directly.

Zone Control  Systems

The ultimate in smart home technology, Zoning Control Thermostat Systems enable its users to control not just the temperature in each room, but the humidity level as well. This enables tremendous utility savings as unused rooms can be left at higher or lower temperatures depending on the season.

Installed using a combination of heat and humidity sensors and zone heating and cooling technology, full Zoning Control Thermostat Systems are best installed in new construction environments only, however, if you have an existing home, we would be happy to discuss tiered solutions that enable many of the same benefits.

Pool Heaters

Here at ADI we specialize in the repair and installation of all types of pool heaters, be they gas or electric. Whether you’re looking to extend the use of your pool to additional months, or just enhance your comfort level on those chilly mornings, we can help. We service all makes and models and all pool types both commercial and residential.

Other Remodeling Resources

Need assistance with your kitchen, bath, or general remodeling services for other areas of the home? We recommend U.S. One Home Improvements. They’re a full-service home improvement and handyman services company in the Washington, DC metro area specializing in kitchen remodeling, bathroom remodeling, handyman services and basements.

For all of your plumbing needs, we recommend Grinnan Plumbing to all of our Montgomery County clients.

Service Areas:Montgomery County, Olney, Laytonsville, Gaithersburg, Rockville, Potomac, Bethesda, Germantown, Kensington, Chevy Chase, Derwood, Silver Spring, Damascus, Wheaton, North Potomac, Cabin John, Glen Echo, Washington DC