Bestcold vs GENERALLUX STAR heat pumps
Measured against models of the same size and duct type, GENERALLUX STAR scores higher on 6 of the 6 ratings. Bestcold has 7 outdoor models, GENERALLUX STAR has 7 outdoor models. Bestcold and GENERALLUX STAR 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.
- Bestcold
- GENERALLUX STAR
- Other ranked manufacturers
Source: AHRI Directory, NEEP · as of
| Rating | Bestcold | GENERALLUX STAR |
|---|---|---|
| Efficiency index | 22%median — | 58%median — |
| COP at 5°F | 19%median 1.80 | 37%median 1.86 |
| Capacity retention at 5°F | 30%median 70% | 69%median 82% |
| HSPF2 | 19%median 8.5 | 31%median 8.6 |
| SEER2 | 27%median 19.0 | 36%median 20.5 |
| EER2 | 16%median 10.0 | 50%median 12.7 |
| Heating capacity at 5°F | 32%median 8,600 Btu/h | 68%median 11,885 Btu/h |
| Outdoor models | 7 | 7 |
| AHRI certifications | 7 | 7 |
Share of models meeting each standard
| Standard | Bestcold | GENERALLUX STAR |
|---|---|---|
| CEE 2025 Tier 1 (Split ASHP) | 71.4%5 models | 57.1%4 models |
| CEE 2026 Tier 1 (Split ASHP) | 57.1%4 models | 57.1%4 models |
| CEE Advanced Tier (Split ASHP) | 0%0 models | 0%0 models |
| Xcel Energy Colorado cold-climate ASHP (2025) | 57.1%4 models | 57.1%4 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.
- Bestcold
- GENERALLUX STAR
- 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 | Bestcold | GENERALLUX STAR |
|---|---|---|
| Non-ducted, up to 1.5 tons | 5 · index 21% | 6 · index 58% |
| Non-ducted, 2 tons | 1 · index 25% | 1 · index — |
| Non-ducted, 2.5–3 tons | 1 · index 23% | None |
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 | BestcoldCold-climate score, best model | GENERALLUX STARCold-climate score, best model |
|---|---|---|
| Non-ducted, up to 1.5 tons | 28.4(50 is the typical model of its size class)MYTW-12HPAC1/Owith ductless indoor unit MYTW-12HPAC1/IAlso listed as MYTW-12HPAC2/O4 of 5 models qualify · AHRI 214844424 | 58.2(50 is the typical model of its size class) (higher)GNS-12HCH23TO2with ductless indoor unit GNS-12HCH23TI24 of 6 models qualify · AHRI 213617768 |
| Non-ducted, 2 tons | None on this board (0 of 1 models qualify) | None on this board (0 of 1 models qualify) |
| Non-ducted, 2.5–3 tons | None on this board (0 of 1 models qualify) | No models in this size class |
All-around best
| Size and duct type | BestcoldAll-around score, best model | GENERALLUX STARAll-around score, best model |
|---|---|---|
| Non-ducted, up to 1.5 tons | 23.6(50 is the typical model of its size class)MYTW-12HPAC1/Owith ductless indoor unit MYTW-12HPAC1/IAlso listed as MYTW-12HPAC2/O5 of 5 models have all five ratings · AHRI 214844424 | 65.0(50 is the typical model of its size class) (higher)GNS-12HCH23TO2with ductless indoor unit GNS-12HCH23TI24 of 6 models have all five ratings · AHRI 213617768 |
| Non-ducted, 2 tons | 24.8(50 is the typical model of its size class)MYTW-24HPAC2/Owith ductless indoor unit MYTW-24HPAC2/I1 of 1 models have all five ratings · AHRI 214844428 | None on this board (0 of 1 models have all five ratings) |
| Non-ducted, 2.5–3 tons | 23.4(50 is the typical model of its size class)MYTW-36HPAC2/Owith ductless indoor unit MYTW-36HPAC2/I1 of 1 models have all five ratings · AHRI 214844429 | No models in this size class |
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 | Bestcold | GENERALLUX STAR |
|---|---|---|
| COP at 5°F | beats 26% · 1.80MYTW-24HPAC2/ONon-ducted, 2 tons | beats 46% · 1.89GNS-12HCH23TO2Non-ducted, up to 1.5 tons |
| Capacity retention at 5°F | beats 46% · 70%MYTW-12HPAC1/OAlso listed as MYTW-12HPAC2/ONon-ducted, up to 1.5 tons | beats 72% · 86%GNS-18HCH21TO2Non-ducted, up to 1.5 tons |
| HSPF2 | beats 25% · 8.5MYTW-36HPAC2/ONon-ducted, 2.5–3 tons | beats 57% · 9.5GNS-12HCH22TO1Non-ducted, up to 1.5 tons |
| SEER2 | beats 35% · 19.0MYTW-36HPAC2/ONon-ducted, 2.5–3 tons | beats 79% · 23.5GNS-12HCH23TO2Non-ducted, up to 1.5 tons |
| EER2 | beats 25% · 10.0MYTW-24HPAC2/ONon-ducted, 2 tons | beats 74% · 13.2GNS-18HCH21TO2Non-ducted, up to 1.5 tons |
| Heating capacity at 5°F | beats 61% · 11,600 Btu/hMYTW-18HPAC2/ONon-ducted, up to 1.5 tons | beats 88% · 15,500 Btu/hGNS-18HCH21TO2Non-ducted, up to 1.5 tons |