In-depth articles on every HVAC system, component, and concept.
Combustion analysis is the systematic measurement and evaluation of flue gas products from gas-fired appliances to determine operating efficiency, verify safe operation, and diagnose performance pro…
HVAC electrical diagrams are the roadmaps that technicians, engineers, and informed homeowners use to understand how heating, ventilation, and air conditioning systems are wired and controlled. With…
Refrigerant pressure is the single most telling diagnostic measurement in air conditioning service work. Every component in the refrigeration cycle affects pressure, and every pressure reading tells…
Manual J is the industry-standard method for calculating residential heating and cooling loads, published by the Air Conditioning Contractors of America (ACCA). Now in its 8th edition (Manual J8), i…
R-454B is a hydrofluoroolefin (HFO) blend refrigerant composed of 68.9% difluoromethane (R-32) and 31.1% 2,3,3,3-tetrafluoropropene (R-1234yf) by weight. Designated by ASHRAE as R-454B and classifie…
Choosing between a heat pump and a furnace is one of the most consequential decisions a homeowner can make. The right system affects monthly energy bills, long-term maintenance costs, indoor comfort…
What HVAC Warranties Are and Why They Matter
An HVAC warranty is a legally binding agreement between a manufacturer, contractor, or third-party provider and the equipment owner that guarantees cove…
HVAC preventive maintenance is the systematic inspection, cleaning, and servicing of heating, ventilation, and air conditioning equipment to keep it running efficiently and prevent unexpected failures…
A dirty air filter can increase your energy consumption by up to 15%, according to the U.S. Department of Energy….
What Is an Evaporative Cooler?
An evaporative cooler, commonly called a swamp cooler, is a cooling device that lowers air temperature by harnessing the natural process of water evaporation. When wate…
Why R-22 Retrofit Matters
R-22 (ASHRAE designation for chlorodifluoromethane, CHClF2) served as the dominant refrigerant in residential and commercial air conditioning for decades. With an ozone de…
What Is a Packaged Terminal Air Conditioner?
A packaged terminal air conditioner (PTAC) is a self-contained heating and cooling unit installed through an exterior wall to provide climate control for…