Calculators
Coming soon
HVAC tonnage
Approximate sizing for residential A/C using simplified Manual J per climate zone.
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What it asks and what it returns
Data in, numbers out.
You give it
Sqft to condition
Climate zone (1-8 IECC)
Insulation level (wall + attic R-value)
Window % of exterior wall
Engine
It returns
Recommended tons (typically 0.8-1.2 tons / 1000 sqft)
Minimum SEER per zone
Estimated ductwork sizing
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