Observed arrival · 2026-11-09
ACSizeCheck puts local climate into AC sizing
A free city-based tool estimates what size air conditioner a home needs using local climate data, and compares the result with a square-foot rule of thumb.
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- U.S. homeowners comparing air-conditioner sizes
- Worth noticing
- Each city uses its nearest NOAA weather station; estimates assume average insulation and sun, with adjustments available on city pages.
Field notes
The lookup is organized by city and state, with state-level counts and links to city examples; examples span Phoenix, Houston, Atlanta, Denver, Chicago, and Seattle. The page says users can alter insulation and sun assumptions on a city's page, but it also identifies a contractor's room-by-room Manual J calculation as the final word for whole-house systems. The homepage does not explain the model behind its running-cost estimates.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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