In-depth articles on every HVAC system, component, and concept. Browse by topic or search below.
HVAC electrical diagrams are the roadmaps that technicians, engineers, and informed homeowners use to understand how heating, ventilation, and air conditioning systems…
Refrigerant pressure is the single most telling diagnostic measurement in air conditioning service work. Every component in the refrigeration cycle affects pressure,…
Manual J is the industry-standard method for calculating residential heating and cooling loads, published by the Air Conditioning Contractors of America (ACCA).…
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…
Choosing between a heat pump and a furnace is one of the most consequential decisions a homeowner can make. The right system…
What HVAC Warranties Are and Why They Matter An HVAC warranty is a legally binding agreement between a manufacturer, contractor, or third-party…
HVAC preventive maintenance is the systematic inspection, cleaning, and servicing of heating, ventilation, and air conditioning equipment to keep it running efficiently…
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…
Why R-22 Retrofit Matters R-22 (ASHRAE designation for chlorodifluoromethane, CHClF2) served as the dominant refrigerant in residential and commercial air conditioning for…
What Is a Packaged Terminal Air Conditioner? A packaged terminal air conditioner (PTAC) is a self-contained heating and cooling unit installed through…
What Is a Variable Air Volume (VAV) System? A Variable Air Volume (VAV) system is a type of HVAC system that controls…