Cold Climate Heat Pump Capacity

Fujitsu AIRSTAGE XLTH (wall ductless): Heating Capacity at 5F and Below

The MAX heating capacity the Fujitsu AIRSTAGE XLTH (wall ductless) holds as it gets cold, from the AHRI-certified NEEP record (AHRI 8779046), with the maintained-% and a balance-point readout.

MAX Capacity by Temperature

The “will it heat my house at 5F” answer is the MAX at 5F (23,200 BTU/hr), shown next to the rated 47F capacity so you see both. Capacity below -15F is not published for this line, so it is not extrapolated here.

Maintained Capacity at 5F

At 5F the Fujitsu AIRSTAGE XLTH (wall ductless) holds 23,200 BTU/hr. That is 96.7% of its rated 47F capacity (23,200 / 24,000), and 64.1% of its MAX 47F capacity (23,200 / 36,200). Both are true; the denominator is always stated. NEEP floors its stored percentage to a whole number (96% and 64% respectively); the computed ratio is shown above.

Balance Point & Backup Heat

The balance point is where this model's declining capacity curve crosses the load line, which runs from zero at 65F to your full design load at the design temperature. Enter your own design heat load in the calculator below for your numbers. This is a readout, not a substitute for a Manual-J load calculation.

Run It for Your Temperature and Load

Source

Capacity and COP transcribed from the AHRI-certified NEEP cold-climate air-source heat pump database, pinned to AHRI certificate 8779046 for outdoor unit AOU24RLXFWH: NEEP ccASHP record, accessed 2026-07-11. The manufacturer engineering data or a Manual-J by an HVAC pro has the final say.

A cold-climate wall-mount head that holds 23,200 at 5F and 19,720 down to -15F. It is the clearest example of why a maintained-% needs its denominator: 23,200 is 96.7% of the rated 24,000 but only 64.1% of the 36,200 MAX at 47F, and both are true.

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