The Carrier WeatherMaker® Two-Speed with Puron® refrigerant is like two heat pumps in one - a low-speed unit for every day heating and cooling, and a high-speed model for extreme weather conditions. This remarkable heat pump operates at low speed up to 75% to 80% of the time to maintain even, consistent temperatures throughout your home. The longer operating cycles create a more continuous flow of heated or cooled air while providing an extra level of comfort by controlling humidity during cooling operation. When additional comfort is required, the system automatically switches to high-speed operation to maintain a comfortable temperature in your home.    1. Two-speed compressor designed specifically for use with Puron refrigerant operates with extra energy efficiency. 2. Copper tube/aluminum fin coil maximizes heat transfer needed for indoor cooling and resists corrosion for years of money saving comfort. 3. Silencer System top allows air to glide smoothly through the system. 4. Highly efficient fan designed to quietly move outdoor air at lower speeds. 5. Deluxe compressor sound hood absorbs compressor sound. 6. Compressor vibration isolator plate, a Carrier exclusive, prevents vibrational noise from being transferred to the base pan. 7. High and low pressure switches prevent the system from damage if a harmful condition is detected. 8. Filter drier constantly filters the refrigerant to remove moisture or other contaminants that can harm your heat pump. 9. Electric circuit board allows precise control over low- and high-speed capacity operation.