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MAMMOTH heat pump efficiency: 4 outdoor models compared

MAMMOTH has 4 heat pump outdoor models certified with this refrigerant group, in 8 AHRI-certified combinations. Each model is compared with models of the same size and duct type, so the scores below do not depend on which sizes MAMMOTH makes. MAMMOTH has no QMID (IRS Qualified Manufacturer ID) on file, so it is not ranked against other manufacturers.

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

ManufacturerData as of updated · sources

Outdoor models
4
AHRI certifications
8
Efficiency index
39%
Typical model vs same-size, same-type peers (6 models)
Meet CEE 2025
50%
2 models

How MAMMOTH compares with comparable models

For each rating: the share of same-size, same-type models that a typical model of this manufacturer beats (50% is typical), its rank, and the raw median for context. Raw medians are not comparable across manufacturers that make different sizes.
MAMMOTH against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of MAMMOTH’s own modelsMAMMOTH is strongest on SEER2 (its typical model beats 55% of comparable models) and weakest on COP at 5°F (15%).
  • MAMMOTH
  • Middle half of its models
  • Other ranked manufacturers
MAMMOTH

Source: AHRI Directory, NEEP · as of

Average peer percentile of MAMMOTH’s models
RatingBeats comparable modelsRankRaw median
Efficiency index6 models scored39%Not ranked—
COP at 5°F6 models scored15%Not ranked1.80
Capacity retention at 5°F6 models scored29%Not ranked65%
HSPF26 models scored41%Not ranked8.8
SEER26 models scored55%Not ranked17.5
EER26 models scored43%Not ranked10.8
Heating capacity at 5°F6 models scored32%Not ranked17,750 Btu/h

Standards met

Share of MAMMOTH’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)50%2
CEE 2026 Tier 1 (Split ASHP)50%2
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)50%2
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate50%2

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
MAMMOTH’s models inside each size and duct typeShape: every model of the group · blue: the middle half of this manufacturer’s models there, median dot, 10th–90th percentile line
  • MAMMOTH (median, middle 50%, 10th–90th)
  • All models of the group
Ducted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsmedian

Source: AHRI Directory · as of

Share of comparable models beaten, per peer group
Size and duct typeModelsIndexCOP@5°FHSPF2SEER2
Ducted, 2 tons249%11%50%72%
Ducted, 2.5–3 tons129%14%24%65%
Ducted, 3.5–4.5 tons163%25%74%79%
Non-ducted, 2 tons120%26%22%16%
Non-ducted, 2.5–3 tons121%2%26%24%

Every MAMMOTH model in the market

MAMMOTH’s 6 models with a known size and duct type, over the shape of the whole catalog.
MAMMOTH models by size and ratingColoured: MAMMOTH · grey shapes: all 11,475 models · lines: catalog medians by size
  • MAMMOTH models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 6 mammoth models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 11,475 models, half a ton at a time.
Show the data as a table
COP at 5°F by size and duct type (every model, by rated cooling capacity)
Duct type, sizeModels10th pct.25thMedian75th90th
Ducted, 0.5 tons1751.701.851.902.102.26
Ducted, 1 ton3401.851.902.002.402.65
Ducted, 1.5 tons7891.751.852.002.202.55
Ducted, 2 tons7821.731.802.002.102.33
Ducted, 2.5 tons7351.711.801.902.092.48
Ducted, 3 tons6521.681.701.902.062.36
Ducted, 3.5 tons6411.611.801.952.202.50
Ducted, 4 tons3671.701.801.912.022.52
Ducted, 4.5 tons5441.701.801.912.082.34
Ducted, 5 tons251.801.801.901.902.15
Non-ducted, 0.5 tons7171.751.811.972.102.19
Non-ducted, 1 ton1,0641.751.801.902.072.25
Non-ducted, 1.5 tons8861.801.801.872.072.21
Non-ducted, 2 tons5641.801.801.832.042.21
Non-ducted, 2.5 tons2751.801.811.841.862.03
Non-ducted, 3 tons5021.801.801.902.002.09
Non-ducted, 3.5 tons701.821.831.902.002.28
Non-ducted, 4 tons2631.801.801.982.002.10
Non-ducted, 4.5 tons1031.771.771.801.972.02
Non-ducted, 5 tons291.982.002.102.302.47

Source: AHRI Directory · as of

Top MAMMOTH models

Its top five cold-climate picks and its top five all-around models across sizes (both scores compare each model with models of its own size and duct type, so sizes compare), then, on each single rating, the model that beats the largest share of comparable models.

Cold-climate picks

Top 2 MAMMOTH cold-climate picks across sizes. 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.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2Btu/h @5°FSEER2MeetsCombosAHRI ref.Compared withScore
1GXH48-60MSK4DHMAMMOTH · Ultra Side Dischargewith ducted air handler GMH48-**MSK4DH14 tons48,000 Btu/h · Ducted81%1.809.039,00017.0CEE 25CEE 26XcelES CC2206724414Ducted, 3.5–4.5 tons58.1
2GXH24-36MSK4DHMAMMOTH · Ultra Side Dischargewith ducted air handler GMH**-36MSK4DH13 tons34,000 Btu/h · Ducted80%1.809.028,00016.0CEE 25CEE 26XcelES CC2206724413Ducted, 2 tons55.3

All-around best

Top 5 MAMMOTH models on the all-around score across sizes. 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.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2SEER2EER2MeetsCombosAHRI ref.Compared withScoreHeating halfCooling halfCold-climate score
1GXH48-60MSK4DHMAMMOTH · Ultra Side Dischargewith ducted air handler GMH48-**MSK4DH14 tons48,000 Btu/h · Ducted81%1.809.017.011.0CEE 25CEE 26XcelES CC2206724414Ducted, 3.5–4.5 tons63.358.168.458.1
2GXH24-36MSK4DHMAMMOTH · Ultra Side Dischargewith ducted air handler GMH24-**MSK4DH12 tons24,000 Btu/h · Ducted92%1.809.017.012.0CEE 25CEE 26XcelES CC2206724412Ducted, 2 tons60.853.168.455.3
3V5BV-24WMAKMAMMOTH2 tons24,000 Btu/h · Ducted48%1.607.818.011.0None2205767439Ducted, 2 tons37.216.558.0Not a pick
4V5BV-28WMAKMAMMOTH2.5 tons28,000 Btu/h · Ducted44%1.707.516.510.0None2205767448Ducted, 2.5–3 tons29.016.042.0Not a pick
5V5BV-28WMAKMAMMOTH2.5 tons28,000 Btu/h · Non-ducted41%1.708.518.010.5None2205767445Non-ducted, 2.5–3 tons21.49.533.2Not a pick

Best model on each rating

MAMMOTH’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FV5BV-24WMAK1.80Non-ducted, 2 tons26%205767442
Capacity retention at 5°FGXH48-60MSK4DH81%Ducted, 3.5–4.5 tons73%206724414
HSPF2GXH48-60MSK4DH9.0Ducted, 3.5–4.5 tons73%206724414
SEER2GXH48-60MSK4DH17.0Ducted, 3.5–4.5 tons77%206724414
EER2GXH24-36MSK4DH12.0Ducted, 2 tons66%206724412
Heating capacity at 5°FGXH48-60MSK4DH41,000 Btu/hDucted, 3.5–4.5 tons74%206724415

All 4 MAMMOTH models in Explore

MAMMOTH size class by size class: cold-climate and all-around

Its best model on each board in every size and duct type it makes. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there). Cold-climate picks must keep at least 70% of their heat at 5°F; the all-around score needs all five ratings and has no such bar.
MAMMOTH: best cold-climate pick and best all-around model per size and duct type, with how many of its models are on each board (top 5 and 5 per class are in the snapshot)
Size and duct typeCold-climate pickCold-climate score, best modelAll-around bestAll-around score, best model
Ducted, 2 tonsNone on this board (0 of 1 models qualify)60.8(50 is the typical model of its size class)GXH24-36MSK4DHwith ducted air handler GMH24-**MSK4DH12 of 2 models have all five ratings · AHRI 206724412
Ducted, 2.5–3 tons55.3(50 is the typical model of its size class)GXH24-36MSK4DHwith ducted air handler GMH**-36MSK4DH11 of 2 models qualify · AHRI 20672441329.0(50 is the typical model of its size class)V5BV-28WMAK1 of 1 models have all five ratings · AHRI 205767448
Ducted, 3.5–4.5 tons58.1(50 is the typical model of its size class)GXH48-60MSK4DHwith ducted air handler GMH48-**MSK4DH11 of 1 models qualify · AHRI 20672441463.3(50 is the typical model of its size class)GXH48-60MSK4DHwith ducted air handler GMH48-**MSK4DH11 of 1 models have all five ratings · AHRI 206724414
Non-ducted, 2 tonsNone on this board (0 of 1 models qualify)19.8(50 is the typical model of its size class)V5BV-24WMAK1 of 1 models have all five ratings · AHRI 205767442
Non-ducted, 2.5–3 tonsNone on this board (0 of 1 models qualify)21.4(50 is the typical model of its size class)V5BV-28WMAK1 of 1 models have all five ratings · AHRI 205767445

All-around board, every manufacturer

Newest MAMMOTH certifications

By AHRI reference number; AHRI issues references in increasing order.
The 4 most recently certified MAMMOTH outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
GXH48-60MSK4DHMAMMOTH · Ultra Side Dischargewith ducted air handler GMH**-60MSK4DH14.5 tons54,000 Btu/h · Ducted1.8076%9.016.0CEE 25CEE 26XcelES CC2206724415
GXH24-36MSK4DHMAMMOTH · Ultra Side Dischargewith ducted air handler GMH**-36MSK4DH13 tons34,000 Btu/h · Ducted1.8080%9.016.0CEE 25CEE 26XcelES CC2206724413
V5BV-28WMAKMAMMOTH2.5 tons28,000 Btu/h · Ducted and non-ducted1.7044%7.516.5None2205767448
V5BV-24WMAKMAMMOTH2 tons24,000 Btu/h · Ducted and non-ducted1.8048%8.518.0None2205767442

Shares hardware with

Manufacturers whose models are the same equipment under another badge. About OEM families

No shared hardware found for MAMMOTH in this group.

Compare MAMMOTH

Manufacturers of a similar size, side by side.

Compare with any manufacturer

MAMMOTH includes these brand names as listed in AHRI: MAMMOTH. Standards are checked against published thresholds; program rules beyond ratings are not checked.