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From: PHOENIX, AZ Yes, it's true. You are a good woman. Then again, you may be the Antichrist.
Common problem. The solder joints on some of the chip resistors in your hvac controller tend to fail and need to be resoldered. Do a search for "dim hvac" and you should find lots of reading material. You can attempt the fix yourself, or remove your controls and send the unit out to be fixed.
Its an easy fix if you can turn a wrench and run a solder gun. Was the first thing I posted about when I got my new 2000, there are several links on how to resolder the components, Ill post them if I can find them.