We have a Trane YCC combined heat and AC unit (gas/electric) that has had some servicing recently after a couple of problems with the heating system. Now the unit is running properly (blower working, furnace producing heat from exhaust) but we have at best, low warm air coming into the house. The air flow is good and there are no leaks in the duct work, it seems be more a problem with exchanging heat inside the unit. It worked fine a week or so ago, hot air coming from vents but now we cannot get the temp inside the house above 60 degree even after running the unit all night. Any suggestions?

:confused:

((that has had some servicing recently))

Call the company back and tell them your furnace is not working correctly. Usually they will run a call for free as a customer service since they just fixed it.

What kind of gas/ natural or propane.

It sounds like your unit is faulting out for some reason. The unit will give you a code on the control board if your trying to heat and its blowing cold air. You need to count the number of blinks from the light on the control board to see whats wrong.