Think of solar greenhouse heaters as a way to supplement existing heating systems. They're out there, but some assembly may be required.

A new proof-of-concept device trapped solar radiation and used it to heat an object to a blistering 1,800 degrees Fahrenheit (1,000 degrees Celsius), raising hopes that steel furnaces could be powered ...

Federal incentives and state regulations weigh heavily in favor of heat pumps these days, but a heat pump may not be the best choice for everyone.