> Heat pumps are 3-4 times as energy efficient as a gas furnace. This depends totally on the outside temperature. Larger, more expensive heat pumps can stay e

> Heat pumps are 3-4 times as energy efficient as a gas furnace. This depends totally on the outside temperature. Larger, more expensive heat pumps can stay efficient down to lower temps. However, they all have a point where they become less efficient than resistive electric heat.