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Bojan,
Try STC1000 in eBay search. These are a great alternative to revamp anything with heating/cooling thermostat problems. 10amp relays for each circuit. I get the dearer option cause they're in Aus and I dont have to wait for OS delivery, and even then they're only $18 delivered. Used last one to drive cooling fans on my astroshed. 1 unit will drive both your heating and cooling circuits.
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