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Air Conditioning Heating

A return vent is the opening that pulls air out of a room and sends it back to the HVAC system. Supply vents push heated or cooled air into the house, and return vents collect it again so the system can filter it,... Continue Reading

An HVAC zoning system splits one ducted heating and cooling system into separate areas, each with its own thermostat. Motorized dampers inside the duct branches open and close on command from a zone control panel at... Continue Reading

A furnace blowing cold air usually comes down to a thermostat setting, a clogged filter that makes the furnace overheat and shut off its burners, burners that won't light or stay lit, or ducts losing heat before it... Continue Reading

A sour, musty smell that hits in the first few minutes after an air conditioner or heat pump starts up has a name in the trade: dirty sock syndrome. It comes from bacteria and mold building into a biofilm on the... Continue Reading

A power outage rarely damages an air conditioner on its own. The harm comes from the surge of electricity when power is restored, which can trip a breaker, blow a fuse, or stress the capacitor and control board. More... Continue Reading

The fan switch on a thermostat has two positions, on and auto, and the one selected changes how much the blower runs, how the home handles humidity, and how much the system costs to operate. On auto, the blower runs... Continue Reading

A house that cools fine downstairs but stays hot upstairs almost never has a broken air conditioner. The system is working; the problem is that the cooling is not distributed evenly between the floors. Heat rises,... Continue Reading

A central air conditioner has two halves that run together: the indoor air handler that moves air through the house, and the outdoor condenser that releases the heat. When the indoor unit hums along but the outdoor... Continue Reading

A heat pump cools a home the same way an air conditioner does, by moving heat out of the house, but it has one part no air conditioner has: a reversing valve that flips the refrigerant flow to switch between heating... Continue Reading