Ductless units are considered to be the most energy efficient air conditioning systems on the market. Reducing the energy required for heating and cooling is essential to achieving the goal of zero net emissions. An air-source heat pump is the most energy efficient heating and cooling system currently available. It draws heat from the air, even when temperatures drop below zero, and moves it as a hot coolant through a small pipe to one or more indoor units that supply heat to the house.
In summer, an air-source heat pump removes heat from the house, even when temperatures exceed 100°F, and brings cool air inside. The Coolerado cooler, which is also suitable for dry climates, is an evaporative cooling technology that is 100% indirect. It can provide four to six tons of cooling with an energy consumption of 1200 watts. Its energy efficiency index (EER) is 40 or more, making it two or three times more efficient than the best conventional air conditioners.
