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build.hvac-load Calculator
Calculates total HVAC cooling or heating load in tons of refrigeration from floor area, envelope U-values, internal gains, and climate zone. 400 sq ft per ton is the rule of thumb for residential cooling; commercial spaces with high occupancy or equipment loads require significantly more.
Inputs
Area
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
H
Vertical measurement. For health calculators, typically standing height without shoes.
U
Reference formula or conversion factor shown for context.
Dt
Reference formula or conversion factor shown for context.
Results
total load (kW)
The combined total across all inputs and components.
tons of refrigeration
The proportional relationship between two quantities.
BTU/hr
Reference formula or conversion factor shown for context.
envelope load (kW)
Sample size or count used in the calculation.
ventilation load (kW)
The value at the specified point or condition.
rule of thumb
A widely used practical approximation or heuristic for this field — useful for quick estimates but not a substitute for rigorous calculation.