Electric furnaces ... A natural gas furnace works by igniting natural gas inside of your furnace's burner. The flames heat up a metal heat exchanger, which in turns heats incoming cold air ...

These systems scavenge heat from the air outside, transfer it to a liquid refrigerant, and pump the refrigerant to a coil or heat exchanger ... furnace in a home ranges between $4,000 for an ...

With an all-electric heat pump system, an extra fan called an air handler needs to be installed (in place of the furnace's blower), and this can have more electrical requirements and add extra cost.