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Hi Sam, thank you for your question. This thermostat works with low voltage (24 VAC) systems only. If you have a low voltage system we need to know how many total wires you have and which terminals are being used on your current thermostat to verify compatibility. If you have a line voltage system, we need to know what is the voltage, wattage and amperage to recommend you a compatible thermostat. Our tech support team is available 7 days a week at (800) 633-3991 or through Private Message at our Honeywell Home Facebook account. - Maria
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