I've been hunting around the forums for a bit now, but couldn't find an answer to this question, so I figured I'd post. Any advice would be much appreciated...
I have a 20+ year old Trane forced-air gas furnace - about 45000 btus. I live in a small condo, only about 700 square feet. We have 6 output registers and 1 intake for the unit.
It runs well, but the air output is very low. Some days, the only room that gets warm is the utility room where the furnace is located.
I've had yearly checkups, and all the techs tell me everything is OK but my furnace blower is "undersized" and I should replace the unit. I popped open the service panel today - the first cold day in a while - and noticed a white residue all over the plate below the pilot light. I also notice that, when the fan kicks on, it's blowing a lot of air out the top of the furnace - near the flue, but not into the vent. (A flag held over the top-front of the machine whips like a US Flag would on a windy day).
[I never noticed either of these symptoms before...]
What do you think? With so many different answers, I don't know who to trust. Should I be worried about air being blown through the top of the machine? What about the white residue?
I'm kinda worried that this might be the first sign of my heat exchanger going south.