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Thread: Power Stealing Thermostats

  1. #7
    HVAC Thermostat Specialist

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    Sensi can use AA batteries without a C connection.... not that I would trust that.



  2. #8
    HVAC Thermostat Specialist

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    Quote Originally Posted by hvactechfw View Post
    Sensi can use AA batteries without a C connection.... not that I would trust that.
    Any word on how long the AA's last?

  3. #9
    HVAC Thermostat Specialist

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    I believe I was told 2 years, but maybe it was less... I know that I was told that with annual tune-ups the batteries could be replaced and there would still be life left in the batteries.

    Now, I certainly would not trust batteries in my home. If I'm gone for an extended period I want to know for sure that my heating system is going to work and not rely on batteries which is why I use and install AC powered thermostats.

  4. #10
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    My oil fired furnace requires 120VAC to run. If I have a power outage the furnace won't run. So what good is a battery powered thermostat for other than keeping the programmed settings? Am I missing something?

  5. #11
    HVAC Thermostat Specialist

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    In your situation where you are looking at using a power stealing thermostat (Nest without a C connection), I would rather have a battery than a power stealing thermostat. The battery operated thermostat would not need the transformer and relay that you are going to need to use on your system to get a nest to work. I would not use a battery powered thermostat over a 24VAC powered thermostat in my home, but it is an option that is out there for people in your situation that want a Wi-Fi thermostat.

  6. #12
    Junior Member

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    If I use a transformer and relay to provide a C wire to the nest would that keep the battery charged and it's only use would be to keep the nest from losing programed settings? Also would the nest get all it's power to run the furnace from the RH and W1 connections? I got the nest for free for signing up with an electricity provider and, based on info on this forum, may sell it and buy a much higher rated WiFi thermostat with a battery to keep from losing programed settings and use the transformer and relay to provide it with a C wire. Does that sound reasonable?

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