NO-LEAK POLICY: Here, a technician performs a leakage test. While some leakage was once commonly chalked up to heating the basement a little bit, those days are gone. “Now,” says Hank Artlip, “if you ...

Have you ever been scared to add outside air to a residential system’s return air duct for ventilation purposes? If you’re like me, I worried the outside air would affect the return temperature too ...