Observed arrival · 2026-10-25
SplitSize puts the math behind heat-pump sizing on the page
A set of free calculators estimates mini-split and heat-pump sizing, costs, line sets, and running costs.
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- For
- Homeowners comparing mini-split sizing and costs
- Worth noticing
- The location picker maps cities across North America, the UK, and Australia to climate zones and winter design temperatures.
Field notes
The visible quick estimate takes room length and width, then adjusts the result through a city or climate-zone selector; users can also enter a winter design temperature. The page lists separate calculators for whole-home loads, multi-zone head sizing, installed-cost ranges, line-set refrigerant, and running costs. Its location list spans cities in North America, the UK, and Australia. The site says its tools share one sizing engine and that it publishes each formula.
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Editorial observations of this landing page, not a rating.
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