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air source heat pump

The outdoor section on some units may 'frost up' when outdoor temperatures are between 0°C and 5°C (between 32°F and 41°F) and there is sufficient moisture in the air[citation needed] which restricts air flow across the outdoor coil. These units employ a defrost cycle where the system switches to "A/C" mode to move heat from the home to the condenser to melt the ice. This requires the supplementary heater (re [...]