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4 wire thermostat to 2 wire

2 months ago

Hello, someone gave me a more modern thermostat with a colorful display. I have a gas furnace with central air which originally came with one of those old mercury thermostats. The issue is the new one is a 2 wire but my old one is a 4 wire (green, yellow, white, and red). I ran a search here but have not come to understand what I need to do or if it's compatible. The old one on the left of course...

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