Hi Everyone ...

I have an upstairs and downstairs heat pump unit ... They are basic models and I can get the model names and #'s if that will help ...

My thermostats are just the plain jane Janitrol units that you slide back and forth for the desired temp (mercury filled level) ...

My upstairs unit over the past year or two has developed an issue where once you set the thermostat to say 74 degrees, then the upper level cools to that temp and the unit shuts off ... Well, sometimes as the upstairs begins getting warmer and the temp readout on the thermostat gets warmer, the unit will not kick on ... (this doesn't happen all the time but it does most of the time)

So, I have a neighbor that had the exact thermostats installed in him home and he had swapped out the thermostats a while back. I removed the upstairs therm. and installed one of his ... and I still get the same response ... I would have thought the thermostat was just going bad ... but it seems that it must be something else ...

Another interesting piece of info is that this doesn't happen during the winter when the heat is being used ... only in the summer when the A/C is used ...

Anyone got any ideas???

Thanks,
TIM