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Have you been using this all along, or is this "new to you" as they say? Is there a small white part mounted on the A/C with two lights on it? That would indicate this has a remote control and not a regular thermostat. IF this has a regular thermostat it would be mounted on the wall and usually white in color. This may have a climate control panel by Intellitec on the wall and those are black. What do you see here? Please get back to me with this and I can direct you further on this. All follow ups are included in our fee.