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Powering Thermostat with 24VDC instead of 24VAC

I would like to convert(hack/mod) a digital thermostat into a temperature controller. Most of it is fairly straight forward, extend the thermistor and hook up a relay to the appropriate hvac coded circuits to control the dependent circuit.

Most (all) digital thermostats (for homes) take 24VAC from the hvac system for power.

24VAC relays are expensive ($15); 24VDC relays are cheap($4).

Is there any reason I can't (shouldn't) simply supply the thermostat with 24VDC instead of 24VAC?

Thanks, Matt

Reply to
FryingDutchman
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Supply the thermostat normally and add a half wave rectifier and filter to the altered relay.

Reply to
Lord Garth

Contacts arc when used with CD.

Graham

Reply to
Eeyore

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