On the higher end of the spectrum are geothermal heat pumps, which are the gold standard for energy efficiency. The initial investment is significant, typically ranging from $6,000 to $20,000 ...
That's gotten a boost from a challenge by the US Department of Energy to create more cold-climate heat pumps. The energy efficiency of geothermal heat pumps makes them a powerful tool for ...
the best heat pumps are highly energy-efficient and can be more cost-effective than installing both central air and furnace heating in your home. The U.S. Energy Information Administration reports ...