I think I found what I need. I just ordered a snap disc switch that is for an attic fan. Turns on at 85 not sure of the turn off differential. Only 6.95 so if it doesn't work I'm not out much. And Rich, I probably confused you with all my technical jargon. Good thing I didn't throw some whatshumacallits and thingamabobs at you. Give me wood and nails, tile and mortar shingles and siding and I do fine, this electrical stuff confuses me