You can best test and diagnose a residential hydronic heating system using pressure ports and balancing valves. However, few residential systems have either of these accessories. A commonly ...

In this troubleshooting situation, the equipment is a package unit heat pump, and the customer has called for service because although they have the thermostat set at 74° F, the temperature in the ...

Your phone rings at 7:00 a.m. in January. The homeowner says their heat pump quit, and the house is freezing. When you pull up, there's ice everywhere on the outdoor unit — a solid block covering the ...