How we compute fit notes
Model pages put certified numbers into context without changing them. These notes use certified fields only. We do not substitute manufacturer specifications when a certified input is missing, and we leave a note out when the calculation cannot be made.
Room-size starting point
Inputs: the model's certified heating capacity at 47°F and the public ENERGY STAR room air conditioner sizing table.
We compare the certified 47°F capacity with every BTU row in the ENERGY STAR table and use the row with the smallest absolute BTU difference. The model page then describes that row's square-foot range as a starting point. Models above the table's 34,000 BTU/hr maximum do not get a mapped room range.
This is a rough comparison between a heat pump's certified heating capacity and ENERGY STAR's room air conditioner cooling guidance. It is not a claim that the model will heat or cool a room of that size. Insulation, design temperature, windows, air leakage, and layout still belong in a room-by-room load calculation.
5°F heating-output retention
Inputs: certified heating capacity at 5°F and certified heating capacity at 47°F from the same model record.
We divide the 5°F capacity by the 47°F capacity, multiply by 100, and round to the nearest whole percent. For example, the displayed percentage answers one narrow question: how much of the model's published 47°F heating output remains at 5°F?
The result describes output retention, not efficiency, energy use, operating cost, or the ability to meet a particular building's heat loss. We calculate it only when both certified capacity fields are numeric and the 47°F value is greater than zero.
HSPF2 position within a capacity class
Inputs: each model's certified HSPF2 and certified heating capacity at 47°F.
We round 47°F heating capacity to the nearest 3,000 BTU/hr to form a MiniSplitFinder comparison group. This grouping is our catalog method, not a certification class. Within that group, we take the arithmetic mean of the certified HSPF2 values available in the current catalog. A model is shown as above, below, or equal to that mean, which is displayed to one decimal place.
This comparison is not a percentile or a rank. It changes when the certified catalog changes, and models without a numeric HSPF2 are excluded from the mean.