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WeatherKing heat pumps

20 certified models, ranked by seasonal cooling efficiency (SEER2), then heating efficiency (HSPF2), highest first.

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  1. 1 WP15AZ60AJ2NFujitsu, Rheem + 2 more
    57,000 Btu/hheating at 47°F 57,000 Btu/hcooling at 95°F

    54,000 Btu (4.5-ton) · Central · 5°F 30,600 Btu/h · Cold output 52–54% · HSPF2 8.1 · 8 pairings

  2. 2 WP15AZ48AJ2NFujitsu, Rheem + 2 more
    45,000 Btu/hheating at 47°F 45,500 Btu/hcooling at 95°F

    48,000 Btu (4-ton) · Central · 5°F 24,200 Btu/h · Cold output 54% · HSPF2 8.1 · 10 pairings

  3. 3 WP15AZ42AJ2NFujitsu, Rheem + 2 more
    39,500 Btu/hheating at 47°F 40,000 Btu/hcooling at 95°F

    42,000 Btu (3.5-ton) · Central · 5°F 20,400 Btu/h · Cold output 52% · HSPF2 8.1 · 10 pairings

  4. 4 WP15AY42AJ2NFujitsu, Rheem + 2 more
    40,000 Btu/hheating at 47°F 40,000 Btu/hcooling at 95°F

    42,000 Btu (3.5-ton) · Central · 5°F 18,900 Btu/h · Cold output 46–53% · HSPF2 8.1 · 328 pairings

  5. 5 WP15AZ30AJ2NFujitsu, Rheem + 2 more
    28,400 Btu/hheating at 47°F 28,400 Btu/hcooling at 95°F

    30,000 Btu (2.5-ton) · Central · 5°F 16,000 Btu/h · Cold output 50–57% · HSPF2 8.1 · 82 pairings

  6. 6 WP15AZ24AJ2NFujitsu, Rheem + 2 more
    22,800 Btu/hheating at 47°F 22,800 Btu/hcooling at 95°F

    24,000 Btu (2-ton) · Central · 5°F 12,500 Btu/h · Cold output 51–63% · HSPF2 8.1 · 78 pairings

  7. 7 WP15AY48AJ2NFujitsu, Rheem + 2 more
    45,500 Btu/hheating at 47°F 45,500 Btu/hcooling at 95°F

    48,000 Btu (4-ton) · Central · 5°F 23,000 Btu/h · Cold output 51% · HSPF2 7.9 · 8 pairings

  8. 8 WP14AY60AJ2NFujitsu, Rheem + 2 more
    55,000 Btu/hheating at 47°F 57,000 Btu/hcooling at 95°F

    54,000 Btu (4.5-ton) · Central · 5°F 25,800 Btu/h · Cold output 47–49% · HSPF2 7.8 · 43 pairings

  9. 9 WP14AY42AJ2NFujitsu, Rheem + 2 more
    40,000 Btu/hheating at 47°F 40,000 Btu/hcooling at 95°F

    42,000 Btu (3.5-ton) · Central · 5°F 19,900 Btu/h · Cold output 50% · HSPF2 7.8 · 28 pairings

  10. 10 WP15AY36AJ2NFujitsu, Rheem + 2 more
    34,200 Btu/hheating at 47°F 34,200 Btu/hcooling at 95°F

    36,000 Btu (3-ton) · Central · 5°F 18,600 Btu/h · Cold output 52–55% · HSPF2 7.8 · 311 pairings

  11. 11 WP15AZ36AJ2NFujitsu, Rheem + 2 more
    31,600 Btu/hheating at 47°F 34,200 Btu/hcooling at 95°F

    36,000 Btu (3-ton) · Central · 5°F 17,800 Btu/h · Cold output 51–57% · HSPF2 7.8 · 14 pairings

  12. 12 WP15AY30AJ2NFujitsu, Rheem + 2 more
    28,400 Btu/hheating at 47°F 28,400 Btu/hcooling at 95°F

    30,000 Btu (2.5-ton) · Central · 5°F 13,900 Btu/h · Cold output 49–51% · HSPF2 7.8 · 8 pairings

  13. 13 WP15AY24AJ2NFujitsu, Rheem + 2 more
    22,600 Btu/hheating at 47°F 22,800 Btu/hcooling at 95°F

    24,000 Btu (2-ton) · Central · 5°F 11,100 Btu/h · Cold output 48–50% · HSPF2 7.8 · 11 pairings

  14. 14 WP15AZ18AJ2NFujitsu, Rheem + 2 more
    17,100 Btu/hheating at 47°F 17,100 Btu/hcooling at 95°F

    18,000 Btu (1.5-ton) · Central · 5°F 9,300 Btu/h · Cold output 47–56% · HSPF2 7.8 · 55 pairings

  15. 15 WP15AY18AJ2NFujitsu, Rheem + 2 more
    17,100 Btu/hheating at 47°F 17,100 Btu/hcooling at 95°F

    18,000 Btu (1.5-ton) · Central · 5°F 8,600 Btu/h · Cold output 48–50% · HSPF2 7.8 · 12 pairings

  16. 16 WP15AY60AJ2NFujitsu, Rheem + 2 more
    55,500 Btu/hheating at 47°F 55,500 Btu/hcooling at 95°F

    54,000 Btu (4.5-ton) · Central · 5°F NR · Cold output — · HSPF2 7.8 · 35 pairings

  17. 17 RHPXZS024AJTFriedrich, Rheem + 4 more
    22,600 Btu/hheating at 47°F 23,600 Btu/hcooling at 95°F

    24,000 Btu (2-ton) · Central · 5°F NR · Cold output — · HSPF2 7.2 · 6 pairings

  18. 18 RHPXZS036AJTFriedrich, Rheem + 4 more
    34,000 Btu/hheating at 47°F 35,000 Btu/hcooling at 95°F

    36,000 Btu (3-ton) · Central · 5°F NR · Cold output — · HSPF2 7.2 · 6 pairings

  19. 19 RHPXZS048AJTFriedrich, Rheem + 4 more
    45,000 Btu/hheating at 47°F 47,000 Btu/hcooling at 95°F

    48,000 Btu (4-ton) · Central · 5°F NR · Cold output — · HSPF2 7.2 · 6 pairings

  20. 20 RHPXZS060AJTFriedrich, Rheem + 4 more
    56,000 Btu/hheating at 47°F 58,000 Btu/hcooling at 95°F

    60,000 Btu (5-ton) · Central · 5°F NR · Cold output — · HSPF2 7.2 · 6 pairings

WeatherKing heat pumps, ranked by seasonal cooling efficiency (SEER2), then heating efficiency (HSPF2)
# Model Brands Type Size At 5°FBtu/h · heating At 47°FBtu/h · heating At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed SEER2median pairing HSPF2Btu/Wh · median pairing Compressor Refrigerant Market Pairings
1 WP15AZ60AJ2N Fujitsu, Rheem + 2 more Central 54,000 Btu (4.5-ton)30,600 57,000 57,000 52–54% 2.30 16.0 8.1 2-stage R-410A US CA 8
2 WP15AZ48AJ2N Fujitsu, Rheem + 2 more Central 48,000 Btu (4-ton)24,200 45,000 45,500 54% 2.20 15.2 8.1 2-stage R-410A US CA 10
3 WP15AZ42AJ2N Fujitsu, Rheem + 2 more Central 42,000 Btu (3.5-ton)20,400 39,500 40,000 52% 2.10 15.2 8.1 2-stage R-410A US CA 10
4 WP15AY42AJ2N Fujitsu, Rheem + 2 more Central 42,000 Btu (3.5-ton)18,900 40,000 40,000 46–53% 2.00 15.2 8.1 2-stage R-454B US CA 328
5 WP15AZ30AJ2N Fujitsu, Rheem + 2 more Central 30,000 Btu (2.5-ton)16,000 28,400 28,400 50–57% 2.10 15.2 8.1 2-stage R-410A US CA 82
6 WP15AZ24AJ2N Fujitsu, Rheem + 2 more Central 24,000 Btu (2-ton)12,500 22,800 22,800 51–63% 2.20 15.2 8.1 2-stage R-410A US CA 78
7 WP15AY48AJ2N Fujitsu, Rheem + 2 more Central 48,000 Btu (4-ton)23,000 45,500 45,500 51% 2.20 15.2 7.9 2-stage R-454B US CA 8
8 WP14AY60AJ2N Fujitsu, Rheem + 2 more Central 54,000 Btu (4.5-ton)25,800 55,000 57,000 47–49% 2.05 15.2 7.8 2-stage R-454B US CA 43
9 WP14AY42AJ2N Fujitsu, Rheem + 2 more Central 42,000 Btu (3.5-ton)19,900 40,000 40,000 50% 2.10 15.2 7.8 2-stage R-454B US CA 28
10 WP15AY36AJ2N Fujitsu, Rheem + 2 more Central 36,000 Btu (3-ton)18,600 34,200 34,200 52–55% 2.00 15.2 7.8 2-stage R-454B US CA 311
11 WP15AZ36AJ2N Fujitsu, Rheem + 2 more Central 36,000 Btu (3-ton)17,800 31,600 34,200 51–57% 2.10 15.2 7.8 2-stage R-410A US CA 14
12 WP15AY30AJ2N Fujitsu, Rheem + 2 more Central 30,000 Btu (2.5-ton)13,900 28,400 28,400 49–51% 1.90 15.2 7.8 2-stage R-454B US CA 8
13 WP15AY24AJ2N Fujitsu, Rheem + 2 more Central 24,000 Btu (2-ton)11,100 22,600 22,800 48–50% 2.00 15.2 7.8 2-stage R-454B US CA 11
14 WP15AZ18AJ2N Fujitsu, Rheem + 2 more Central 18,000 Btu (1.5-ton)9,300 17,100 17,100 47–56% 2.10 15.2 7.8 2-stage R-410A US CA 55
15 WP15AY18AJ2N Fujitsu, Rheem + 2 more Central 18,000 Btu (1.5-ton)8,600 17,100 17,100 48–50% 2.00 15.2 7.8 2-stage R-454B US CA 12
16 WP15AY60AJ2N Fujitsu, Rheem + 2 more Central 54,000 Btu (4.5-ton)— 55,500 55,500 — — 15.2 7.8 2-stage R-454B US CA 35
17 RHPXZS024AJT Friedrich, Rheem + 4 more Central 24,000 Btu (2-ton)— 22,600 23,600 — — 15.2 7.2 2-stage R-410A US CA 6
18 RHPXZS036AJT Friedrich, Rheem + 4 more Central 36,000 Btu (3-ton)— 34,000 35,000 — — 15.2 7.2 2-stage R-410A US CA 6
19 RHPXZS048AJT Friedrich, Rheem + 4 more Central 48,000 Btu (4-ton)— 45,000 47,000 — — 15.2 7.2 2-stage R-410A US CA 6
20 RHPXZS060AJT Friedrich, Rheem + 4 more Central 60,000 Btu (5-ton)— 56,000 58,000 — — 15.2 7.2 2-stage R-410A US CA 6

The share is heat output at 5°F divided by the 47°F rating. Tests use different compressor speeds.

20 of 20 units

Other sizes

Every size class, with how many units it holds and its median heat output at 5°F