Efficiency ratings of up to 17 SEER and 9.50 HSPF-can save hundreds of dollars a year, compared to a standard heat pump;Energy Star qualified-meets or exceeds EPA guidelines for energy efficiency;High efficiency outdoor coil-provides exceptional heat transfer and low air resistance for high-efficiency operation;Dual fuel capability-can be combined with a gas furnace to enhance comfort and fuel efficiency by alternating between electric and gas heat, optimizing energy use and minimizing heating costs;Sound levels as low as 74 dB-much quieter than a standard heat pump;Precision balanced direct drive fan-delivers ultra quiet operation with a patent pending fan design;Two stage scroll compressor-operates at low stage most of the time for quieter, more efficient performance;Designed to work with the Humiditrol whole home dehumidification system;Chlorine-free R-410A refrigerant-provides exceptional comfort without exacting a costly environmental toll;Permaguard Cabinet-heavy-gauge, galvanized steel construction, louver coil guard, baked-on powder finish and durable zinc-coated steel base provide long lasting protection against rust and corrosion;Smarthinge louver design-allows quick, easy access to interior components from all sides for cleaning and maintenance. Protects coils from damage and provides clean appearance;Drainage holes-prevent damaging moisture from collecting inside the basepan