In this month’s troubleshooting situation we find ourselves dealing with a gas furnace, and the customer has called to say that “there is no heat at all.” This is a residential unit that is equipped ...

“This sounds obvious, but it’s true: A lot of people don’t have their thermostat set right,” says Bobby DiFulgentiz, director of product management for Lennox International. Double-check that the ...

In this troubleshooting situation, a technician has responded to a complaint of “not cooling” on a six-year-old R-410A split system that employs an up-flow gas furnace indoor air handler and a ...