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Sum X heat pumps

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

Filters Sum X
  1. 1 SM-12HFO2-CUSum X
    12,000 Btu/hheating at 47°F 12,000 Btu/hcooling at 95°F

    12,000 Btu (1-ton) · Mini-split · 5°F 8,400 Btu/h · Cold output 70% · HSPF2 9.5 · 1 pairing

  2. 2 SM-12HSM2-CUSum X
    12,000 Btu/hheating at 47°F 12,000 Btu/hcooling at 95°F

    12,000 Btu (1-ton) · Mini-split · 5°F 10,600 Btu/h · Cold output 88% · HSPF2 9.5 · 1 pairing

  3. 3 SM-18HSM2-CUSum X
    18,000 Btu/hheating at 47°F 18,000 Btu/hcooling at 95°F

    18,000 Btu (1.5-ton) · Mini-split · 5°F 18,000 Btu/h · Cold output 100% · HSPF2 9.5 · 1 pairing

  4. 4 SM-18HFO2-CUSum X
    18,000 Btu/hheating at 47°F 18,000 Btu/hcooling at 95°F

    18,000 Btu (1.5-ton) · Mini-split · 5°F 13,300 Btu/h · Cold output 74% · HSPF2 9.5 · 1 pairing

  5. 5 SM-36HSM2-CUSum X
    34,000 Btu/hheating at 47°F 34,000 Btu/hcooling at 95°F

    30,000 Btu (2.5-ton) · Central · 5°F 27,000 Btu/h · Cold output 79–97% · HSPF2 9.4 · 2 pairings

  6. 6 SM-24HSM2-CUSum X
    24,000 Btu/hheating at 47°F 24,000 Btu/hcooling at 95°F

    24,000 Btu (2-ton) · Central · 5°F 20,800 Btu/h · Cold output 87–88% · HSPF2 9.1 · 2 pairings

  7. 7 SM-48HSM2-CUSum X
    48,000 Btu/hheating at 47°F 48,000 Btu/hcooling at 95°F

    48,000 Btu (4-ton) · Central · 5°F 34,000 Btu/h · Cold output 71–77% · HSPF2 8.7 · 2 pairings

  8. 8 SM-60HSM2-CUSum X
    54,000 Btu/hheating at 47°F 54,000 Btu/hcooling at 95°F

    54,000 Btu (4.5-ton) · Central · 5°F 38,000 Btu/h · Cold output 70–74% · HSPF2 8.6 · 2 pairings

Sum X 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 SM-12HFO2-CU Sum X Mini-split 12,000 Btu (1-ton)8,400 12,000 12,000 70% 2.05 23.5 9.5 Variable R-410A CA 1
2 SM-12HSM2-CU Sum X Mini-split 12,000 Btu (1-ton)10,600 12,000 12,000 88% 2.00 23.0 9.5 Variable R-454B CA 1
3 SM-18HSM2-CU Sum X Mini-split 18,000 Btu (1.5-ton)18,000 18,000 18,000 100% 1.90 21.0 9.5 Variable R-454B CA 1
4 SM-18HFO2-CU Sum X Mini-split 18,000 Btu (1.5-ton)13,300 18,000 18,000 74% 1.80 20.5 9.5 Variable R-410A CA 1
5 SM-36HSM2-CU Sum X Central 30,000 Btu (2.5-ton)27,000 34,000 34,000 79–97% 1.98 18.0 9.4 Variable R-454B CA 2
6 SM-24HSM2-CU Sum X Central 24,000 Btu (2-ton)20,800 24,000 24,000 87–88% 2.13 18.0 9.1 Variable R-454B CA 2
7 SM-48HSM2-CU Sum X Central 48,000 Btu (4-ton)34,000 48,000 48,000 71–77% 2.21 17.8 8.7 Variable R-454B CA 2
8 SM-60HSM2-CU Sum X Central 54,000 Btu (4.5-ton)38,000 54,000 54,000 70–74% 2.23 17.7 8.6 Variable R-454B CA 2

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

8 of 8 units

Other sizes

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