To provide heat, a heat pump works by extracting heat from the air outside your home and transferring it to refrigeration coolant – the coolant is then compressed, which increases the temperature significantly; the coolant is then moved to the indoor unit of the heat pump, which then passes air over the hot coolant, ...
David
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busterwasmycat
Same way a fridge works, basically. Through selective compression and volatilization of a refrigerant in a closed system. Heat is added to the refrigerant with compression, and heat is lost with expansion of that refrigerant. Heat pumps can serve as either coolers or heaters, depending upon where the expansion and compression are performed relative to the interior air circulation system.
Volatilization of the refrigerant cools the refrigerant, so it takes heat from the ambient air (cools that air), and similarly. compression adds heat ot the ambient air (heats that air). Is the ambient air at the one or other location destined for inside the building or outside the building, depends on whether the system is functioning as a cooler or a heater.
ponderer
Heat pumps have the plumbing to be able to reverse the condenser and evaporator function. A 4-way valve it is called. Thus being a heater or an AC unit. Versatile and ingenious.