Due to sudden temp changes, sometimes there
is a need to switch from heat to A/C.
I was wondering if this is harmful to the heating/cooling
The unit is in the attic and the heat is gas-powered.
The same unit is used for A/C.
The heater/AC is about 6 years old.
Some electronic thermostats will automatically switch between heating
and cooling without using a switch. I had an Emerson stat that did
this. Sorry, I don't remember the model.
One thing you want to avoid is short-cycling your A/C Compressor.
This means turning it off and then turning it on again right away.
The high pressure differential causes extra stress on the compressor
when starting and may burn out, trip breakers, fuses, etc.
Some thermostats have built-in short cycle prevention. There is a
time delay of 2 minutes or so while the difference in pressure between
the high side and the low side is allowed to blead off. Cheaper
thermostats do not have short cycle protection.
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