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4SHP18LS Pro Series Two Stage Heat Pump

Advanced features and technology mixed with long-term dependability. When you choose the Armstrong Air 4SHP18LS heat pump' you can take comfort knowing this powerful combination is at work to give you the highest levels of efficiency' reliability and cooling performance. It keeps your home consistently cool - day after day and season after season' building on more than 80 years of expertise.

Pair this model with a Pro Series™ variable speed furnace and a Comfort Sync thermostat' for optimum performance. With the Pro Series' you’re in control of every aspect of your home’s climate' as well as your energy costs.

  • Two-Stage Scroll Compressor The two-stage scroll compressor will run longer' gentler cooling cycles at low capacity during mild weather and switch to full capacity on hotter days' keeping you comfortable all season long.
  • Up To 18 SEER Efficiency Rating The higher the SEER rating' the more efficiently your unit operates' saving you money on utility bills.
  • Up TO 9.2 HSPF Efficiency Rating HSPF (Heating Seasonal Performance Factor) rates the energy efficiency of your heat pump. The higher the HSPF rating' the more efficiently your unit operates' saving you money on utility bills.
  • Quiet Shift Technology Allows heat pumps to enter defrost mode without excessive noise. Since refrigerant pressure is allowed to equalize before the switch' the heat pump can dissipate performance robbing frost and ice quietly.
  • MHT Technology Armstrong Air proprietary heat transfer system. A specially designed fan shroud pulls air evenly throughout the air conditioner’s coil surface. The coil features rifled tubing to enhance refrigerant flow' while lanced coil fins increase surface contact between metal and air. All combine for maximum heat transfer and efficiency.
MODELCooling Cap. MBtuHSEERHeating Cap.MBtuHHSPFRefrigerant Charge Oz.Line SizeDimensions HxWxDWeight Lbs.
4SHP18LS124P24.0 17.0 18.5 9.0 300 3/8 - 7/8 44x35.7x37.7 341
4SHP18LS136P35.0 17.0 34.0 9.0 283 3/8 - 7/8 44x35.7x37.7 338
4SHP18LS148P47.0 16.0 44.0 9.0 262 3/8 - 7/8 44x35.7x37.7 338
4SHP18LS160P56.0 15.5 55.0 9.0 274 3/8 - 7/8 44x35.7x37.7 361

Warranty Information

  • Compressor for 120 months -
  • All Parts for 120 months -

Available Documents