My house (built 2007) has separate heat and A/C systems. We have a gas-fired furnace with three zone baseboard heating, and two zone A/C with separate compressors and coils/blowers (one in the basement for the first floor and the other in the attic for the second floor). As a result, there are 5 thermostats scattered about the house.

Is it possible to run a zone for the furnace off the same thermostat that controls the air conditioning? I'm about ready to upgrade to wifi-enabled thermostats so I can monitor/control the temp remotely. Would be much happier buying only 2 if I can get away with it, rather than 4 or 5.

The third heat zone is the MBR suite. It heats up pretty quick, so I think I could leave that one on the existing conventional programmable unit.

What say the climate control sages?

Thanks in advance!

I don't understand why they weren't together in the first place?

Cannot answer that. Maybe two different contractors at two different times?
So are you saying that I can make the same thermostat run both systems - not at the same time, of course?

Yes

Proper wiring is crucial, or you'll blow the transformers.

Sounds like possibly you have a boiler with 3 zones and a pair of split AC systems. Do you have air ducts and dampers or do you have pipes valves and pumps coming off your “furnace”?

Pipes and valves off the furnace, feeding baseboards.

Plus vents and returns for the a/c.
My wife intensely dislikes forced hot air heat. If she had her way, we would have installed cast iron radiators.
I insisted on central a/c.


SO yes, separate systems.

quote:

Originally posted by motor59:
Pipes and valves off the furnace

Boiler

while still possible to integrate your heating and cooling controls, it is most likely well beyond what even a very capable handy person should attempt. Best to call in a pro.