gas furnace.

Heat pump

*Extracts heat from the environment, using either the ground or air as the source, via the refrigeration cycle.
*Requires less energy than electric resistance heating and possibly more efficient than fossil fuel fired furnaces (gas/oil/coal).
*Air source types may not be suitable for cold climates unless used with backup (secondary) source of heat. Newer models may still provide heat when coping with temperatures below 0 °C (32 °F).
*A

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