Travis Jordan" wrote...
"dpb" wrote...

40A to 15A more efficient???? Now THAT is one efficient system...

I ain't buyin', sorry.

Normally I'd agree, but if a resistive heat air handler was changed out
for a variable speed heatpump only air handler, it would be completely
logical. Or maybe the original breaker was oversized.

I just checked Trane's documentation and all of their 1.5T and smaller heat
pump systems state a MCB of 15A. It is quite possible the old system (1987
vintage, probably twice the load) had an oversized breaker installed also.