Can Nest control 2 baseboard heaters & 1 air conditioner (rooftop unit)?

[DesertMike62]

We are about to remodel a large room that contains 2 side-by-side baseboard heating units (each with their own separate thermostat/controller), plus is cooled by a large roof-top air conditioning unit (which is controlled by a separate in-room thermostat). Can a single Nest Learning Thermostat control all three of these (assuming we first connect a controller that "links" the 2 side-by-side baseboard units to treat them as a single unit, and install a low-voltage converter for them)? If yes, any instructions/advice would be greatly appreciated!

Thanks!

[CoolingWizard]

Basically the answer is no. There’s a reason that there are separate thermostats and that’s because the thermostat is in the room where the heating waste board is that probably. This is to ensure that the temperature of that room is controlled by that thermostat. Is the only heat in your home those two baseboards and I’m assuming they are fed by a water boiler?

The AC Cooling Wizard

[DesertMike62]

Wow! Thank you for your lightening-fast response! To clarify, the 2 side-by-side baseboard heaters each have their on in-line thermostat (with separate dial temperature controllers -- units from the early 80s, we believe), and are 100% electric (i.e., not water or oil-based). They are fully electric, and their only purpose is to heat this specific room which is a 1980s add-on to a (now) 100-yr-old home (the rest of the home is heated via a gas boiler radiant heat system). The rooftop A/C unit (a commercial unit), only serves to cool the first story, including this add-on room (where the thermostat for the A/C unit is located). There is a separate rooftop A/C unit (residential) that cools only the second floor, and it has its own thermostat on that floor. We were hoping to wire/connect the 2 baseboard heaters together first, and then control them as 1 unit -- and to use a Nest Learning Thermostat to then control that combined baseboard heater unit and the 1st floor A/C unit.

[CoolingWizard]

OK you have to be very careful with those early 1980 and prior electric heater on the wall. The thermostats are controlling at full power of 120 V AC. And that’s because that’s the way they used to do those type systems and those are not going to be compatible with a nest thermostat. This is  because the nest thermostat is a conventional HVAC control system which only operates at Twenty Four Volts of AC power.  

As to your rooftop air conditioners, commercial ones are three phase power and residential ones are typically single phase power. Commercial units usually have a economizer installed and residential ones do not.

The AC Cooling Wizard

[Jenelyn_O]

Hi there,

Thanks for posting in the Google Nest Community forum. I'm sorry for the delay. I hope you get the answer you're looking for. Please let us know if you still have questions or concerns, as we'll be willing to assist you further.

I appreciate your help, @CoolingWizard.

Best,
Jenelyn

[Markjosephp]

Hi DesertMike62,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Regards,

Mark

[Dan_A]

Hey there,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.
 

Cheers,

Dan