Radiant Glass Industries windows have low-voltage electric wires running through them to turn one of a homes main sources of heat loss into a heat generator. An average sized radiant glass window uses as much energy as two light bulbs.

According to the company, RGI uses existing technology that can be found in grocery store freezer doors, which keeps the store's glass from fogging up. This same technology can help a home’s windows warm up.

While radiant windows will cost more than regular windows "