Symptoms of a bad thermostat include an air conditioner that doesn’t turn off, and this can result in an air conditioning unit that is burnt out. Determine which thermostat system is best for controlling certain units withhelp from a professional carpenter, woodworker and handyman in this free video on home maintenance and thermostat repair. Expert: Stephen G. Anthony Bio: Stephen G. Anthony is a professional carpenter, woodworker and handyman based in New York City and south Florida. Filmmaker: Paul Muller