Skip to content
Rebate.Blue

FRANKLIN vs ZERO heat pumps

Measured against models of the same size and duct type, ZERO scores higher on 4 of the 6 ratings. FRANKLIN has 74 outdoor models, ZERO has 69 outdoor models. FRANKLIN and ZERO have no QMID on file and are not ranked.

New to heat pump ratings? The Simple view explains them in plain words →

CompareData as of updated · sources

Against comparable models

Each cell is the share of same-size, same-type models that the manufacturer’s typical model beats (50% is typical); the higher score is in bold. Raw medians are underneath for context: they depend on which sizes each one makes, so they are not compared.
FRANKLIN and ZERO on every ratingPeer scores, 0–100 · grey ticks: every ranked manufacturer · shaded: the middle half of each one’s modelsMeasured against models of the same size and duct type, ZERO scores higher on 4 of the 6 ratings.
  • FRANKLIN
  • ZERO
  • Other ranked manufacturers
FRANKLINZERO

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingFRANKLINZERO
Efficiency index54% (higher)median —49% (higher)median —
COP at 5°F44%median 1.9248%median 1.89
Capacity retention at 5°F45% (higher)median 52%43% (higher)median 70%
HSPF244%median 7.846%median 8.6
SEER250%median 15.253%median 19.0
EER264% (higher)median 11.746% (higher)median 11.0
Heating capacity at 5°F41%median 17,400 Btu/h44%median 11,700 Btu/h
Outdoor models7469
AHRI certifications3,90889

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardFRANKLINZERO
CEE 2025 Tier 1 (Split ASHP)32.4%24 models59.4%41 models
CEE 2026 Tier 1 (Split ASHP)29.7%22 models55.1%38 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)21.6%16 models47.8%33 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate18.9%14 models24.6%17 models

Sizes and duct types offered

Models in each peer group, with the efficiency index of those models against the rest of the group.
Side by side, inside each size and duct typeShape: every model of the group · bars: each manufacturer’s middle half, median dot, 10th–90th line · 9 groups where both have models
  • FRANKLIN
  • ZERO
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsDucted, 5 tons and up1.90239 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 modelsmedian

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of

Models per peer group · efficiency index within the group
Size and duct typeFRANKLINZERO
Ducted, up to 1.5 tons10 · index 55%2 · index 59%
Ducted, 2 tons12 · index 52%5 · index 69%
Ducted, 2.5–3 tons21 · index 50%7 · index 57%
Ducted, 3.5–4.5 tons24 · index 50%9 · index 63%
Ducted, 5 tons and up3 · index 42%1 · index 57%
Non-ducted, up to 1.5 tons8 · index 63%33 · index 48%
Non-ducted, 2 tons2 · index 72%9 · index 49%
Non-ducted, 2.5–3 tons6 · index 64%8 · index 39%
Non-ducted, 3.5–4.5 tons1 · index 78%3 · index 50%

Cold-climate and all-around picks, size class by size class

Each manufacturer’s best model on each board in every size and duct type, side by side; the higher score is in bold. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there), so the two compare fairly even when they make different sizes.

Cold-climate picks

Best cold-climate pick per size and duct type (keeps at least 70% of its heat at 5°F). Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
Size and duct typeFRANKLINCold-climate score, best modelZEROCold-climate score, best model
Ducted, up to 1.5 tons74.9(50 is the typical model of its size class) (higher)MSH093E23MCAAwith ducted air handler MST093E21ADAA7 of 10 models qualify · AHRI 20690042752.0(50 is the typical model of its size class)Z3SOV-18HDM-US1 of 2 models qualify · AHRI 214723150
Ducted, 2 tons79.4(50 is the typical model of its size class)MSH243E23MCAAwith ducted air handler MST243E21ADAAAlso listed as MSH243F25MCAA2 of 12 models qualify · AHRI 20690043080.3(50 is the typical model of its size class) (higher)ZSOV-24HDM-USwith ducted air handler ZDV-24HDM-US2 of 5 models qualify · AHRI 212928560
Ducted, 2.5–3 tons80.4(50 is the typical model of its size class) (higher)MST273F25MHAA5 of 21 models qualify · AHRI 21438344357.4(50 is the typical model of its size class)Z3SOV-27HDM-US1 of 7 models qualify · AHRI 213732663
Ducted, 3.5–4.5 tons74.9(50 is the typical model of its size class)MST483F25MHAA1 of 24 models qualify · AHRI 21438344974.9(50 is the typical model of its size class)Z5SOV-48HDM-US1 of 9 models qualify · AHRI 213732669
Ducted, 5 tons and upNone on this board (0 of 3 models qualify)None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons76.2(50 is the typical model of its size class)MSH093F25MCAAwith ductless indoor unit MSH093F25AXAA8 of 8 models qualify · AHRI 21438343386.0(50 is the typical model of its size class) (higher)ZMSB-09HV-USHHwith ductless indoor unit ZMSB-09HV-USHH24 of 33 models qualify · AHRI 213917748
Non-ducted, 2 tons84.5(50 is the typical model of its size class) (higher)MSH243F25MCAAwith ductless indoor unit MSH243F25AXAA2 of 2 models qualify · AHRI 21438343674.2(50 is the typical model of its size class)ZSOV-24HDM-USwith ductless indoor unit ZEV-24HDM-US4 of 9 models qualify · AHRI 212928564
Non-ducted, 2.5–3 tons90.9(50 is the typical model of its size class) (higher)MST363F25MHAA3 of 6 models qualify · AHRI 21438344549.3(50 is the typical model of its size class)Z3SOV-27HDM-US1 of 8 models qualify · AHRI 213732662
Non-ducted, 3.5–4.5 tons76.2(50 is the typical model of its size class)MST483F25MHAA1 of 1 models qualify · AHRI 21438344880.5(50 is the typical model of its size class) (higher)Z5SOV-48HDM-US2 of 3 models qualify · AHRI 213732668

All-around best

Best all-around model per size and duct type. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
Size and duct typeFRANKLINAll-around score, best modelZEROAll-around score, best model
Ducted, up to 1.5 tons85.2(50 is the typical model of its size class) (higher)MSH093E23MCAAwith ducted air handler MST093E21ADAA10 of 10 models have all five ratings · AHRI 20690042759.4(50 is the typical model of its size class)Z3SOV-18HDM-US1 of 2 models have all five ratings · AHRI 214723150
Ducted, 2 tons80.1(50 is the typical model of its size class)MSH243E23MCAAwith ducted air handler MST243E21ADAAAlso listed as MSH243F25MCAA10 of 12 models have all five ratings · AHRI 20690043083.8(50 is the typical model of its size class) (higher)ZSOV-24HDM-USwith ducted air handler ZDV-24HDM-US2 of 5 models have all five ratings · AHRI 212928560
Ducted, 2.5–3 tons83.7(50 is the typical model of its size class) (higher)MST363F25MHAA16 of 21 models have all five ratings · AHRI 21438344671.5(50 is the typical model of its size class)Z3SOV-27HDM-US3 of 7 models have all five ratings · AHRI 213732663
Ducted, 3.5–4.5 tons82.0(50 is the typical model of its size class)MST483F25MHAA15 of 24 models have all five ratings · AHRI 21438344982.0(50 is the typical model of its size class)Z5SOV-48HDM-US2 of 9 models have all five ratings · AHRI 213732669
Ducted, 5 tons and up54.5(50 is the typical model of its size class)MSH603E18MCAAwith ducted air handler MST603E18ADAA3 of 3 models have all five ratings · AHRI 20690044557.1(50 is the typical model of its size class) (higher)ZSOV-60HDM-USwith ducted air handler ZDV-60HDM-US1 of 1 models have all five ratings · AHRI 212928563
Non-ducted, up to 1.5 tons87.0(50 is the typical model of its size class) (higher)MSH093F25MCAAwith ductless indoor unit MSH093F25AXAA8 of 8 models have all five ratings · AHRI 21438343386.7(50 is the typical model of its size class)ZMSB-09HV-USHHwith ductless indoor unit ZMSB-09HV-USHH33 of 33 models have all five ratings · AHRI 213917748
Non-ducted, 2 tons84.3(50 is the typical model of its size class) (higher)MSH243F25MCAAwith ductless indoor unit MSH243F25AXAA2 of 2 models have all five ratings · AHRI 21438343672.0(50 is the typical model of its size class)ZSOV-24HDM-USwith ductless indoor unit ZEV-24HDM-US9 of 9 models have all five ratings · AHRI 212928564
Non-ducted, 2.5–3 tons86.4(50 is the typical model of its size class) (higher)MST363F25MHAA5 of 6 models have all five ratings · AHRI 21438344566.7(50 is the typical model of its size class)Z3SOV-27HDM-US8 of 8 models have all five ratings · AHRI 213732662
Non-ducted, 3.5–4.5 tons77.9(50 is the typical model of its size class) (higher)MST483F25MHAA1 of 1 models have all five ratings · AHRI 21438344873.8(50 is the typical model of its size class)Z5SOV-48HDM-US3 of 3 models have all five ratings · AHRI 213732668

All-around board, every manufacturer

Standout model on each rating

Each manufacturer’s model that beats the largest share of comparable models on the rating; the higher share is in bold.
Top model per rating by peer percentile, with its AHRI-certified value and peer group
RatingFRANKLINZERO
COP at 5°Fbeats 94% · 2.51GPHH56041A*Ducted, 5 tons and upbeats 96% · 2.22ZMSB-24HV-USHHNon-ducted, 2 tons
Capacity retention at 5°Fbeats 97% · 103%MST273F25MHAANon-ducted, 2.5–3 tonsbeats 84% · 87%Z5SOV-48HDM-USDucted, 3.5–4.5 tons
HSPF2beats 98% · 12.0MSH093E23MCAADucted, up to 1.5 tonsbeats 98% · 11.2ZSOV-24HDM-USDucted, 2 tons
SEER2beats 99% · 22.5GSZV902410A*Also listed as ASZV902410ADucted, 2 tonsbeats 99% · 20.9Z5SOV-48HDM-USDucted, 3.5–4.5 tons
EER2beats 98% · 16.2MSH093F25MCAANon-ducted, up to 1.5 tonsbeats 95% · 15.8ZMSB-09HV-USHHCAlso listed as ZMSB-09HV-USHHC-ONon-ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 96% · 20,000 Btu/hMST183E23MHAAAlso listed as MST183F25MHAANon-ducted, up to 1.5 tonsbeats 90% · 17,200 Btu/hZMSB-18HV-USHHCAlso listed as ZMSB-18HV-USHHC-ONon-ducted, up to 1.5 tons

More comparisons

Pick any two manufacturers