Single or Dual Fuel System??

[Mamo]

I have a combination gas-fired condensing hot water heater and space heating fan coil.  This if for heating the home and hot water.  I also have a Tosot heat pump Unitary Split Air Conditioner.  It is used to cool the home.  It is functioning as an Air Conditioner Only.   The NEST thermostat installation will ask if I have a single or dual fuel system.  Because the heat pump is only being used for Air Conditioning I have a Single Fuel System?  Right??

[Markjosephp]

Hello Mamo,

Thanks for reaching out to the Google Nest Community Forum. I'd love to know more about this.

Depending on the type of HVAC system you have, the Heat pump type with another heating unit (furnace) has a separate wire for power, and there are times when the system's power is connected to only one power wire. With this, could you please share with us your old thermostat's wiring setup so we can verify how it should be labeled?

I'll look forward to your response.

Regards,
Mark

[Dan_A]

Hey there,

I wanted to follow up and see if you still needed help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Kind regards,

Dan

[Jenelyn_O]

Hi Mamo,

Chiming in — I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns, as I'll be locking this thread in 24 hours.

I appreciate your help, Mark and Dan.

Best,

Jenelyn

[Mamo]

Thank you to everyone that replied to my query.  I contacted Google Nest directly and one of their techs walked me through the process of how to set my system up.  They were awesome and the problem is now solved.  Thanks.

[Markjosephp]

Hey Mamo,

Awesome! I'm glad to hear it was sorted out. Thanks for your effort in contacting our support team. It looks like we have come to a solution, so I'm going to lock this thread within 24 hours. If you have any other concerns or questions, please feel free to create a new thread.

Regards,
Mark

[Mamo]

Thank you to everyone that replied to my query.  I contacted Google Nest directly and one of their techs walked me through the process of how to set my system up.  They were awesome and the problem is now solved.  Thanks.