Hot gas from the compressor in a heat pump first flows to the condenser coils, transferring heat to the interior space and condensing into a liquid, then travels through the expansion valve before returning to the evaporator coils.
When operating in the heat mode, hot gas leaves the compressor and first flows to the condenser coils that are inside the heated space. The electrically driven compressor raises the temperature and pressure of the gas, which allows for the transfer of heat to the room as the gas condenses into a liquid inside the condenser coils. Subsequently, the liquid passes through an expansion valve, cooling as it expands, before returning to the outdoor evaporator coils to continue the cycle.
In summary, the hot gas from the compressor is first directed to the condenser coils where heat is emitted to warm up the room. After condensing into a liquid, the fluid flows back to the outdoor evaporator via the expansion valve, where it is cooled during expansion, completing the heating cycle process of a heat pump.