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DiamondAir vs TUTTOKOOL heat pumps

Measured against models of the same size and duct type, DiamondAir scores higher on 2 of the 6 ratings. DiamondAir has 7 outdoor models, TUTTOKOOL has 22 outdoor models. DiamondAir and TUTTOKOOL have no QMID on file and are not ranked.

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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.
DiamondAir and TUTTOKOOL 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, DiamondAir scores higher on 2 of the 6 ratings.
  • DiamondAir
  • TUTTOKOOL
  • Other ranked manufacturers
DiamondA…TUTTOKOOL

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingDiamondAirTUTTOKOOL
Efficiency index—median —27%median —
COP at 5°F—median —46%median 1.84
Capacity retention at 5°F—median —14%median 41%
HSPF226% (higher)median 7.518% (higher)median 7.5
SEER221%median 14.321%median 14.3
EER260% (higher)median 11.738% (higher)median 11.0
Heating capacity at 5°F—median —17%median 17,100 Btu/h
Outdoor models722
AHRI certifications7390

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardDiamondAirTUTTOKOOL
CEE 2025 Tier 1 (Split ASHP)0%0 models0%0 models
CEE 2026 Tier 1 (Split ASHP)0%0 models0%0 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)0%0 models0%0 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate0%0 models0%0 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 · 4 groups where both have models
  • DiamondAir
  • TUTTOKOOL
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 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 typeDiamondAirTUTTOKOOL
Ducted, up to 1.5 tons1 · index —1 · index 31%
Ducted, 2 tons1 · index —5 · index 23%
Ducted, 2.5–3 tons3 · index —7 · index 25%
Ducted, 3.5–4.5 tons2 · index —9 · index 29%

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 typeDiamondAirCold-climate score, best modelTUTTOKOOLCold-climate score, best model
Ducted, up to 1.5 tonsNone on this board (0 of 1 models qualify)None on this board (0 of 1 models qualify)
Ducted, 2 tonsNone on this board (0 of 1 models qualify)None on this board (0 of 5 models qualify)
Ducted, 2.5–3 tonsNone on this board (0 of 3 models qualify)None on this board (0 of 7 models qualify)
Ducted, 3.5–4.5 tonsNone on this board (0 of 2 models qualify)None on this board (0 of 9 models qualify)

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 typeDiamondAirAll-around score, best modelTUTTOKOOLAll-around score, best model
Ducted, up to 1.5 tonsNone on this board (0 of 1 models have all five ratings)38.0(50 is the typical model of its size class)THP5018A1000Awith ducted air handler L(E,G)M36BJ1 of 1 models have all five ratings · AHRI 218612878
Ducted, 2 tonsNone on this board (0 of 1 models have all five ratings)40.4(50 is the typical model of its size class)THP5024A1000Awith ducted air handler TWM5E31B000A3 of 4 models have all five ratings · AHRI 216434177
Ducted, 2.5–3 tonsNone on this board (0 of 3 models have all five ratings)52.8(50 is the typical model of its size class)THP5036A1000Awith ducted air handler T4AH4E60C000A+TXV5 of 7 models have all five ratings · AHRI 216434229
Ducted, 3.5–4.5 tonsNone on this board (0 of 2 models have all five ratings)57.2(50 is the typical model of its size class)THP5048A1000Awith ducted air handler T4AH4E61C000A8 of 10 models have all five ratings · AHRI 216434265

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
RatingDiamondAirTUTTOKOOL
COP at 5°F—beats 97% · 2.68THP5036A1000ADucted, 2.5–3 tons
Capacity retention at 5°F—beats 33% · 59%THP5048A1000ADucted, 3.5–4.5 tons
HSPF2beats 27% · 7.5D1448HCL32ADucted, 3.5–4.5 tonsbeats 38% · 7.8THP5042A1000ADucted, 3.5–4.5 tons
SEER2beats 22% · 14.3D1448HCL32ADucted, 3.5–4.5 tonsbeats 50% · 16.0DX5048E100ADucted, 3.5–4.5 tons
EER2beats 67% · 11.7D1448HCL32ADucted, 3.5–4.5 tonsbeats 83% · 12.0THP5042A1000ADucted, 3.5–4.5 tons
Heating capacity at 5°F—beats 73% · 13,400 Btu/hTHP5024A1000ADucted, up to 1.5 tons

More comparisons

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