A furnace heat exchanger keeps dangerous gases out of the air circulating in the building. It's a must-have on any furnace that burns gas or oil.

Johnathan C. Brewer II is a licensed general contractor specializing in kitchen, bath remodels and general construction with two decades of professional experience. He is also the owner of Brewer ...

Kelly has over 10 years of experience writing about home design and improvement for many prominent publications. She also spent several years working at a tech startup for an interior design game ...