Múltiple heating and cooling devices. How will nest thermostat work?

[djscott1909]

Hello,

sorry for the daft question but I live in a home which has 3 different systems. I have central heating, air conditioning upstairs and air conditioning downstairs. All of which are controlled by their own control panel (with central heating and upstairs aircon control panels next to each other). Can nest learning thermostat only control my central heating, only upstairs or possible for all 3 but I would need 3 separate nest thermostats? Any help would be much appreciated. 

[bullsbarry]

I'm also looking for information on this. My configuration would be similar but slightly different: 2 floors with a full HVAC for the upstairs and a separate one for the finished basement. I've seen information about multiple zones on a single unit, but not how to make the two separate units work together.

[Patrick_Caezza]

Multiple zones are used when you have only one HVAC for all floors and you want to be able to control each floor separately. A zone controller with a damper on each floor is controlled by a separate thermostat on each floor.

You really don't want multiple HVAC systems on different floors being controlled but just one thermostat.

[Jake]

Hey djscott1909,

I wanted to check in and see if you managed to see CoolingWizard's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.
 

Thank you so much CoolingWizard, and Patrick_Caezza for the helpful replies.

Best regards,
Jake

[djscott1909]

Yes thank you.

To be honest I am going through a very hot summer in Spain and I think my priority now is for a single Nest for downstairs to control temperature through the night. My current aircon does not have the ability to switch on if a certain temperature is reached. I assume this is possible with nest and would help keep the house to a certain temperature through the night without leaving the aircon on all night. 

Assuming that is true I think that will be the purpose of my purchase. Thanks to all for the responses. 

[Ryan_G]

Hey folks,

Thanks for being here in the Google Nest Community.

I'd like to jump in here and check if you have further questions, djscott1909. Let us know by replying to this thread.

Regards,

Ryan

[Ryan_G]

Hey folks,

I just wanted to follow up and see if you're still in need of help. Please let us know as we would be happy to answer any questions you may have. 

Best regards,
Ryan
 

[Ryan_G]

Hey there,

Thanks for being here in the Google Nest Community. 

I'd like to bump in here and make sure that you’ve seen our response.
Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,
Ryan
 

[CoolingWizard]

For the most part, if you had had a separate thermostat for each of those systems, you would need a nest thermostat for each old thermostat you have currently.  A single thermostat can control a Cooling System and a Heating system. 

[Patrick_Caezza]

Post a few pictures of your current thermostat layout so we have a better idea of what you mean.

It sounds like your heating is separate from the cooling system and has its own thermostat.

Your cooling system has a thermostat on each floor, one upstairs and another downstairs. Do these go to separate cooling systems or a single system with a zone controller?

[djscott1909]

I am struggling to get a picture uploaded at this point. To cover your question the cooling system is 2 separate systems for each floor. So I do expect the upstairs and downstairs would need separate thermostats as a consequence but keen to understand if I can combine the upstairs solutions. 

If I can upload a picture I will share shortly. 

[Patrick_Caezza]

To post a picture, you can drag and drop it into the reply window or use the camera icon.

If all you want to do is combine a stand-alone a/c and a stand-alone heating system, so they can be controlled by one thermostat is possible. How complex it is to do it depends on the two separate systems.

[djscott1909]

The above is a picture of the upstairs setup. The top one controls the heating for the whole house, while the bottom is the controller for the upstairs air conditioning. These are the 2 I am hoping to combine into one thermostat. 

I have included a picture of the downstairs controller of the air con as well. I think this will need to be completely separate.

[CoolingWizard]

The only Environmental control system capable of handling two separate HVAC systems is a commercial system.  Your only choice is to have two separate thermostats.