I live in 1400 sq./ft ranch with a full basemnet. I have a Trane AC that is about 12-14 years old.
The air condition seems to work fine and cools the finished part of basement out of a single duct without any problem. However, it takes a very long time to cool the main floor. Even when it does get cool, it is never as cool as the basement.
Before I call someone in, I was wondering what could be causing the problem. When the furnace is on during the winter, we do not experience the problem.
When we replaced the furnace a few years ago, I mentioned this to the installer. He installed this vent blocker that is in an air pipe near the furance. Moving the latch either way does not seem to do anything.
Any suggestions? Is it a problem with the vents? Vents need to be cleaned? Any info is appreciated.