Bosch said this week that its cold-climate heat pump, the IDS Ultra, unveiled at CES, is officially for sale. It's been just three years since the DOE's challenge to manufacturers, including two ...

If you live in a colder climate, it's important to understand how these heat pump systems function in extreme temperatures.

In October, the Energy Department announced that eight manufacturers participating in its challenge to produce efficient residential cold climate heat pumps had ... current best-in-class products ...