// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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build.hvac-load-manual-j Calculator
Performs a simplified Manual J HVAC load calculation from conditioned area, wall/roof/window U-values, occupancy, and climate data. Manual J is the ACCA-standard method required for HVAC equipment sizing permit applications in most US jurisdictions.
Inputs
Conditioned Sqft
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Ceilings Ft
Vertical measurement. For health calculators, typically standing height without shoes.
Insulation R
Reference formula or conversion factor shown for context.
Climate Zone
Reference formula or conversion factor shown for context.
Windows Sqft
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
estimated cooling load (BTU/hr)
The value at the specified point or condition.
AC tonnage needed
Sample size or count used in the calculation.
base load
Reference formula or conversion factor shown for context.