The most common method to defrost appropriately in refrigeration involves both time for initiation and a combination of time and temperature for defrost termination (ending defrost). But why can't we just use temperature or time alone? (You may wonder.) Imagine a common freezer with a designed box temperature of -10°F and a coil temperature of […]

Air-to-water pool heat pumps are seeing more and more popularity in the climates that can support them over the more traditional gas and electric pool heaters we usually see. While they definitely contain some familiar operating principles to an air-to-air heat pump, there are some striking differences in how the heat is transferred and how […]

Whether you’re putting an A/C unit in a new home or doing a retrofit, installation jobs make up a pretty big chunk of residential HVAC work.  Installation can be hard work, and there’s a lot more to it than throwing a unit together and making sure it starts up. When you consider building design, ductwork, […]