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thanks for the input. are there thermostats that use a remote sensor so that it will take different room temps into account? I have adjustable vents but they dont seem to be working very well. I have the current t-stat set in the middle of the first floor. All the rooms on that floor are withing 1.5 degrees of what the tstat says.
I have done some floor plan changes to the house so maybe i need to calibrate the system again. It was working GREAT when the last tenant was there, very even. Also, what is the working life of the adjustable vents? I replaced all of them about 3 years ago with the ones from Home Depot. I think I have 3 of the nice ones from a plumbing store. Thanks, John