Gradient's advanced window unit can heat and cool 500 square feet, all without needing any fancy electrical work. I saw it at ...

While you may not be playing with fire (as you would be with a furnace), heat pump installations are still pretty complex.

You can opt for either “ductless” mini-split heat pumps if your home doesn’t have ductwork, or purchase a heat pump to work with the existing ducting in your home. Because they work ...