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I have a carrier non programmable thermostat. Do you know what other therm might be a compatible replacement?

Thank you... I am trying to get pro out here. Been all weekend with no air. Thank you again

Not sure how to do that.

Carrier thermostat went blank, is not working. No batteries to change. Checked fuse in the air handler and it is OK. What could be the problem?

Carrier thermostat went blank, not working. No battery to replace. Checked fuse in air handler and it is OK. What could be the problem?