Yes, you can replace just the rooftop unit in order to minimize costs and retain use of your current thermostat. You'll first want to remove the air distribution box cover and look for the controller. There will be a wire harness that hangs down and plugs into the controller and will have either a 6-pin or 9-pin connector. If you have a 9-pin connector then you'll need an adapter to plug into the controller. You'll also want to check the old rooftop unit to see what the BTU rating is and... view full answer...
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