A heat pump functions as a typical air conditioning system in the cooling mode — absorbing heat from indoors and rejecting it outdoors. In heating mode, the coils reverse their functions. The outdoor ...

In this month’s troubleshooting situation, a customer has called for service, reporting that their heating system isn’t working. The equipment is a rooftop gas pack, and when you arrive you confirm ...

An oscillating control valve may appear to be the source of control instability and repair efforts are usually focused only there. When this fails to solve the issue, further investigation often ...