Skip Navigation

"We’re proud of the company we keep"

In the wake of the Coronavirus, we’ve got a few more ideas and products to add to your toolbox.  Try these solutions from Nu-Calgon.

View Here


One of the premier lines of Mars products that William E. Kingswell offers is Comfort-Aire. These residential and commercial heating and cooling solutions offer great comfort at an affordable price.

The William E. Kingswell Difference

When you choose William E. Kingswell for your Comfort-Aire and Mars HVAC unit or accessories, you partner with a family owned and operated business that has satisfied the needs of hundreds of thousands of customers throughout our 90+ years in business. We offer excellent customer service and go above and beyond to meet the needs of every residential homeowner and commercial business we work with.

Why Comfort-Aire?

Comfort-Aire products are manufactured by Mars, one of the oldest and most trusted brands in the heating and cooling business. Mars is a family owned and operated, trusted brand, and they offer numerous residential and commercial heating and cooling solutions.

What Comfort-Aire Products Do We Offer?

Our stock of Comfort-Aire products includes:

  • Residential A/C condensers
  • Residential heat pumps
  • Residential packaged units
  • Replacement parts
  • Gas furnaces
  • Oil furnaces
  • Line sets
  • Thermostats
  • Air handlers
  • Evaporator coils
  • Geothermal pumps
  • Water source/commercial heat pumps
  • Commercial unit heaters
  • Commercial packaged units
  • Commercial split systems
  • Infrared heaters
  • Ductless mini-split units
  • Window air conditioning units
  • Dehumidifiers

Take a Look at Our Other Products

In addition to AirEase products, William E. Kingswell also offers an enormous variety of residential HVAC and commercial HVAC products, including those from other Allied brands. If you aren’t sure what the right fit for your home or business is, don’t hesitate to get in touch.

We Are Proud of the Company We Keep

William E. Kingswell has remained a distinguished provider of commercial and residential heating and cooling services since 1937. We have provided an unmatched level of customer service to all of our clients, and we enjoy being the preferred HVAC equipment distributor of countless customers. We offer a comprehensive range of high-quality heat pumps, boilers, unit heaters, HVAC accessories, and more. William E. Kingswell works with businesses and homeowners throughout Maryland, Washington, D.C., and Virginia, including Baltimore, Frederick, Annapolis, Fairfax, Manassas, Richmond, Fredericksburg, Virginia Beach, and Leesburg. To learn more about our extensive range of SpacePak, Concord, Allied Commercial, and Bard HVAC equipment, contact us today!