Comfort Air Quality & Efficiency by Design has been doing business ever since 1999. Located in Huntsville, Ala., it operates as a heating, ventilation and air conditioning (HVAC) contractor. The firm specializes in providing heating and air-conditioning repair services. It repairs, as well as replaces furnaces, heat pumps, package units, ductless mini splits, ductwork, and more. Comfort Air Quality & Efficiency by Design provides various other services, including gas furnace cleanouts, blower door testing, preventative maintenance, new construction installs and indoor air quality checks.