I have been running a C$ t-stat on my gas forced furnance and AC unit for 1 1/2 yrs now...has not skipped a beat. Biggest trouble was finding a GOOD heating guy to connect it up right. The C4 t-stat works great on forced forced air system...I wouldn't even attempt it on a heat pump, or a zone system...it is two flakey...Need to remember C4 is from Utah were most house only have gas furnaces and swamp coolers...any more advanced than that they dont work great at all. KEEP IT SIMPLE in order for the C4 t-stat to work.
