Yes, they do! In fact, adding a heat pump to your gas furnace is ideal to achieve maximum efficiency in all extremes of the Calgary climate. Every Winter in Calgary has days of extreme cold below -15ºC that require gas heating. However, more than 75% of the days in a typical year have temperatures above freezing — when a heat pump can save you money versus gas heating or provide cooling for comfort. A dual-fuel system prepares your home for anything — wet Spring storms, hot Summer days, chilly Fall winds, and cold Winter nights.  When you pair your Lennox heat pump with a compatible high-efficiency furnace and thermostat, the system automatically switches between electric and gas heating for maximum energy efficiency.