Good morning. My 'Comfortmaker' furnace doesn't pump out hot air. I've changed the filter several times but even when the thermostat is set at 68 - 70 degrees, the air coming out is at best luke-warm. Is there some trouble shooting I can do before I call a technician to check it out?

Thank you.

Rene

Make sure the stat is on heat and turn it all the way up to make sure it is making contact. If all of that is OK then you have a control/burner problem. This could be many different things so from your description it would be impossible to tell.