I was too young to notice the array of hot water pipes — the telltale sign of a boiler. "If you have heat that comes out of a vent, you have a furnace," says John Gabrielli of Air Temp Solutions.

If you want an air conditioner that can make you comfortable throughout the year, a hot and cold AC is a wise purchase. It ...

The DWH A2W Heat Pump uses R32 (difluoromethane) as a refrigerant and reportedly achieves a coefficient of performance (COP) of 4.9. Noise levels range between db (A) 52 and db (A) 56.