Why would my furnace turn on when the temperature is 90 degrees?

Question:

Answers:
Are you sure that the furnace is on? Many central air conditioners and furnaces share a blower- maybe its just the blower for your AC coming on?

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maybe your timer is off. waayyyy off.

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someone set the temp higher, or maybe only the fan is on. Is it blowing out hot air or cold?

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I suspect the furnace isn't going on, but the fan is starting. There is an upper limit switch that will kick on the fan if its not working right.

You need a repair guy to make it stop. Running the fan doesn't hurt and it circulates the air, so you may want to put up with it instead.

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