The highly efficient devices are the darlings of the environmental movement. Here’s why. By Hilary Howard Heat pumps, which both warm and cool buildings and are powered by electricity, have been ...

What's the difference between warm air and cool air? In fact, what does “temperature” even mean? It's stranger than you think. At a basic level, if you increase the temperature of air, you increase ...

Despite a dip in sales last year, heat pumps are continuing to take Europe by storm. These devices take energy from the air, ground or water and transform it into heat or cool air. But how, when and ...