DiamondAir vs Nutech heat pumps
Measured against models of the same size and duct type, Nutech scores higher on 2 of the 6 ratings. DiamondAir has 7 outdoor models, Nutech has 28 outdoor models. DiamondAir and Nutech 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
- Nutech
- Other ranked manufacturers
Source: AHRI Directory, NEEP · as of
| Rating | DiamondAir | Nutech |
|---|---|---|
| Efficiency index | —median — | 54%median — |
| COP at 5°F | —median — | 58%median 2.00 |
| Capacity retention at 5°F | —median — | 42%median 70% |
| HSPF2 | 26%median 7.5 | 60%median 9.2 |
| SEER2 | 21%median 14.3 | 64%median 19.3 |
| EER2 | 60% (higher)median 11.7 | 43% (higher)median 11.0 |
| Heating capacity at 5°F | —median — | 52%median 19,550 Btu/h |
| Outdoor models | 7 | 28 |
| AHRI certifications | 7 | 40 |
Share of models meeting each standard
| Standard | DiamondAir | Nutech |
|---|---|---|
| CEE 2025 Tier 1 (Split ASHP) | 0%0 models | 85.7%24 models |
| CEE 2026 Tier 1 (Split ASHP) | 0%0 models | 78.6%22 models |
| CEE Advanced Tier (Split ASHP) | 0%0 models | 0%0 models |
| Xcel Energy Colorado cold-climate ASHP (2025) | 0%0 models | 60.7%17 models |
| DOE Cold Climate Heat Pump Challenge | 0%0 models | 0%0 models |
| ENERGY STAR Cold Climate | 0%0 models | 0%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.
- DiamondAir
- Nutech
- All models of the group
Raw ratings are only placed side by side within one size and duct type, where they are comparable.
Source: AHRI Directory · as of
| Size and duct type | DiamondAir | Nutech |
|---|---|---|
| Ducted, up to 1.5 tons | 1 · index — | 5 · index 70% |
| Ducted, 2 tons | 1 · index — | 3 · index 65% |
| Ducted, 2.5–3 tons | 3 · index — | 4 · index 54% |
| Ducted, 3.5–4.5 tons | 2 · index — | 6 · index 57% |
| Ducted, 5 tons and up | None | 2 · index 64% |
| Non-ducted, up to 1.5 tons | None | 6 · index 41% |
| Non-ducted, 2 tons | None | 2 · index 43% |
| Non-ducted, 2.5–3 tons | None | 3 · index 42% |
| Non-ducted, 3.5–4.5 tons | None | 1 · index 51% |
| Non-ducted, 5 tons and up | None | 1 · index 27% |
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
| Size and duct type | DiamondAirCold-climate score, best model | NutechCold-climate score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | None on this board (0 of 1 models qualify) | 81.3(50 is the typical model of its size class)NOX230-09HFN10-M1with ducted air handler NTJ-09HWFN10-M1-D4 of 5 models qualify · AHRI 216578942 |
| Ducted, 2 tons | None on this board (0 of 1 models qualify) | 77.1(50 is the typical model of its size class)NOD30-24HFN10-M1with ducted air handler NTJ-24HWFN10-M1-D3 of 3 models qualify · AHRI 215894267 |
| Ducted, 2.5–3 tons | None on this board (0 of 3 models qualify) | 60.6(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D2 of 4 models qualify · AHRI 215894278 |
| Ducted, 3.5–4.5 tons | None on this board (0 of 2 models qualify) | 77.9(50 is the typical model of its size class)N6OE30-48HFN10-M1D-D6 of 6 models qualify · AHRI 215894281 |
| Ducted, 5 tons and up | No models in this size class | None on this board (0 of 2 models qualify) |
| Non-ducted, up to 1.5 tons | No models in this size class | 65.6(50 is the typical model of its size class)N3OX430-18HFN10-M1-D3 of 6 models qualify · AHRI 215894273 |
| Non-ducted, 2 tons | No models in this size class | 45.1(50 is the typical model of its size class)NOX430-24HFN10-230with ductless indoor unit NSAG11D-24HRFN10-2302 of 2 models qualify · AHRI 215894262 |
| Non-ducted, 2.5–3 tons | No models in this size class | 47.2(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D1 of 3 models qualify · AHRI 215894277 |
| Non-ducted, 3.5–4.5 tons | No models in this size class | 60.1(50 is the typical model of its size class)N6OE30-48HFN10-M1D-D1 of 1 models qualify · AHRI 215894282 |
| Non-ducted, 5 tons and up | No models in this size class | None on this board (0 of 1 models qualify) |
All-around best
| Size and duct type | DiamondAirAll-around score, best model | NutechAll-around score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | None on this board (0 of 1 models have all five ratings) | 80.8(50 is the typical model of its size class)NOX230-09HFN10-M1with ducted air handler NTJ-09HWFN10-M1-D5 of 5 models have all five ratings · AHRI 216578942 |
| Ducted, 2 tons | None on this board (0 of 1 models have all five ratings) | 78.8(50 is the typical model of its size class)NOD30-24HFN10-M1with ducted air handler NTJ-24HWFN10-M1-D3 of 3 models have all five ratings · AHRI 215894267 |
| Ducted, 2.5–3 tons | None on this board (0 of 3 models have all five ratings) | 69.5(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D4 of 4 models have all five ratings · AHRI 215894278 |
| Ducted, 3.5–4.5 tons | None on this board (0 of 2 models have all five ratings) | 85.1(50 is the typical model of its size class)N6OE30-48HFN10-M1D-D6 of 6 models have all five ratings · AHRI 215894281 |
| Ducted, 5 tons and up | No models in this size class | 65.3(50 is the typical model of its size class)NOE30-60HFN10-M2with ducted air handler NHJ-60HWFN10-M2-D2 of 2 models have all five ratings · AHRI 215894270 |
| Non-ducted, up to 1.5 tons | No models in this size class | 62.1(50 is the typical model of its size class)N3OX430-18HFN10-M1-D6 of 6 models have all five ratings · AHRI 215894271 |
| Non-ducted, 2 tons | No models in this size class | 56.7(50 is the typical model of its size class)N4OD30-27HFN10-M1D-D2 of 2 models have all five ratings · AHRI 215894274 |
| Non-ducted, 2.5–3 tons | No models in this size class | 58.3(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D3 of 3 models have all five ratings · AHRI 215894277 |
| Non-ducted, 3.5–4.5 tons | No models in this size class | 52.8(50 is the typical model of its size class)N6OE30-48HFN10-M1D-D1 of 1 models have all five ratings · AHRI 215894282 |
| Non-ducted, 5 tons and up | No models in this size class | 32.5(50 is the typical model of its size class)N6OE30-60HFN10-M1D-D1 of 1 models have all five ratings · AHRI 215894283 |
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.
| Rating | DiamondAir | Nutech |
|---|---|---|
| COP at 5°F | — | beats 95% · 2.44NOX230-12HFN10-M1Ducted, up to 1.5 tons |
| Capacity retention at 5°F | — | beats 84% · 93%NWDB-48HI1N4S4-M-SE18Ducted, 3.5–4.5 tons |
| HSPF2 | beats 27% · 7.5D1448HCL32ADucted, 3.5–4.5 tons | beats 95% · 11.5NOX230-09HFN10-M1Ducted, up to 1.5 tons |
| SEER2 | beats 22% · 14.3D1448HCL32ADucted, 3.5–4.5 tons | beats 96% · 20.4N6OE30-48HFN10-M1D-DDucted, 3.5–4.5 tons |
| EER2 | beats 67% · 11.7D1448HCL32ADucted, 3.5–4.5 tons | beats 91% · 13.3NOX430-18HFN10-M1Ducted, up to 1.5 tons |
| Heating capacity at 5°F | — | beats 83% · 14,000 Btu/hN3OX430-18HFN10-M1-DNon-ducted, up to 1.5 tons |