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 ...

We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › Solar-powered water pumps harness energy from the sun to efficiently move water from ...

When you think about cutting your utility bill, your mind probably jumps to energy-guzzling appliances like your fridge, TV or washing machine. But here’s something you might not realize: your water ...

Heat pump water heaters have been around for decades, but it’s only recently that they’ve emerged as a go-to for energy efficiency. More households are opting for heat pump water heaters than ever ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Thom Dunn Thom Dunn is a writer focusing on home heating and cooling. He once ...