Product Description Summit heat pumps offer excellent energy efficiency and industry-leading quiet operation. Locating plumbing connections on the back of the the unit for unobstructed access, makes installation fast and easy and a standard ultra gold fin evaporator coil make it corrosion resistant – even in the harshest coastal environment. Summit delivers energy efficiency, superior value, performance and reliability. Thermostatic expansion valve delivers the right amount of refrigerant for optimal performance, regardless of the outdoor temperature Electronic temperature control ensures constant temperature and energy savings.