Quote:
Originally Posted by gtojohn
hvac was a control 40va transformer powered 24/7. If you have a heatpump sometimes its a 60va. It would be difficult to remove and keep the convenience of your thermostat.
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Of course I don't know the details of your HVAC, but you might try a small 12V switching powersupply (taking less than 1 Watt) in series with a thermostat and relay. And then let the relay switch the mainpower to your HVAC.