Friedrich 's Chill Premier Inverter room air conditioners are equipped with Precision Inverter compressors which provides variable comfort, Library Quiet operation, and ultimate efficiency. Friedrich 's Precision Inverter variable speed compressor adjusts up or down based on need, providing the user precise temperature control as well as a wider range of BTU capacities. These units also operate up to 35 more efficiently than traditional window AC's and are Energy Star certified. Friedrich 's Chill Premier Inverter comes with R32 refrigerant, which is a greener, more sustainable refrigerant with a lower global warming potential. The Chill Premier Inverter line has corrosion protection on both the internal and external coils to protect and extend the life of the unit. These models have a slide out chassis for installation in a window or through the wall. This line comes with a 1-year parts warranty and a 5-year warranty on the sealed system. Smart Design: Traditional window units don't allow the homeowner to open the windows once installed, limiting the amount of fresh air, but the Friedrich Chill Premier Inverter features a flexible design that includes: SimpleSill Technology - Allows the window to be opened and closed after installationThree-step Installation Simplifies the process with a one-piece frame, included hardware and expandable side curtainLibrary Quiet Operation: Soft-Start technology eliminates hard stop-and starts and run at lower sound levels than other compressor types. QuietMaster technology combines heavy duty insulation, stiffened sheet metal, optimized air flow and counterweights to dampen vibration. Quiet mode operates at ultra-low fan speed for the quietest cooling availableDown to 32dB on fan only and 42 dB in coolingVariable Comfort Technology: The Precision Inverter compressor operates at precise capacity needed while the Turbo Cool boosts cooling operation by up to 41 . Ultimate Efficiency: Friedrich 's commitment to environment-friendly cooling is shown in the Chill Premier Inverter. The unit operates up to 35 more efficiently1 than traditional window air conditioners. The Chill Premier Inverter is ENERGY STAR certified and uses sustainable R-32 refrigerant to help protect our planet. Smart Investment Every unit maintains precise temperature control while providing homeowners peace of mind through: Money Saver Mode - Runs fan only when cooling to save on billsBuilt-in Filter - Allows homeowners to breathe easy with washable design and automatic clean filter remindersReliable Quality - Units are backed by a 5-year limited warrantySmart Features Designed with intelligent features that put the homeowner in control, the Chill Premier Inverter includes industry-leading advantages like: Built-in Wi-Fi Control - Manage comfort from anywhere with the Friedrich Go AppAuto Air Sweep - Moves louvers up and down, extending the air flow for maximum circulation and coolingIntelligent Sleep Mode - Smart temperature auto adjustment with Turbo Fast Cooling.