"Mix and match perfectly for your home Designer by Stealth Comfort gives you all the efficiency and quiet operation you expect, with your choice of air handler types. Mix and Match from ceiling cassettes, concealed ducts or ceiling/ floor air handlers in a range of sizes, so you can Design the perfect system for your home.. • HIGH EFFICIENCY, UP TO 23 SEER / 12.5 HSPF • IDEAL FOR HARSH CLIMATES: -31˚F - 115˚ F • CONNECT UP TO 5 INDOOR UNITS (ZONES) TO OUTDOOR SYSTEM • • Cooling range: 0˚F - 115˚ F • Heating range: -31˚F - 75˚F • Sound levels down to 5 on outdoor unit 8 dB(A) "