Duo-Therm Rooftop RV Air Conditioner with 13,500 btu of cooling power 38 years ago Duo-Therm introduced the very first RV rooftop air conditioner, and has always led the field with new ideas to serve the changing needs of RV owners. A camper's dream come true Duo-Therm Heat Pumps operate entirely on 120-volt AC electricity, so there's nothing to light, no gas supply to worry about. Model #600315.321C (new installation require distribution box sold separately part # 3107206)
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