When a gas furnace is not in operation, most send a steady, wasteful draft of warm household air traveling up the venting system and out the roof. The Sure Comfort  products feature an induced-draft blower that works in conjunction with a hot surface ignition system to pull hot gases through the heat exchanger at a constant and controlled rate of flow. As the burner cycles off, the draft blower stops, keeping the heating air in the system.

Pilot lights also can be wasteful. The electric ignition in many Sure Comfort’s furnaces eliminates the need for a constantly burning pilot. This feature alone gives up to 6% higher efficiency.