Input Parameters
About This Calculator
Uses the unit index method with corrections based on empirical data:
- Base cooling index varies by building type
- Orientation correction (west-facing has highest load, north-facing lowest)
- Window-to-wall ratio correction (larger windows = more solar gain)
- Insulation level correction (better insulation = lower load)
- Design temperature difference correction
Results include a 10% design safety margin. Recommended capacity can be used directly for AC unit selection.
How this cooling load calculator works
This tool uses a simplified unit-index method. It starts from a typical cooling load per square meter, then adjusts for building type, orientation, insulation, window-to-wall ratio, and indoor-outdoor temperature difference.
Inputs explained
- Room area sets the base sensible cooling load estimate.
- Room height is used to report cooling load per volume.
- Building type selects a typical base cooling index.
- Orientation and window ratio approximate solar heat gain impact.
- Insulation level and design temperatures adjust the base estimate for envelope performance and climate severity.
FAQ
Does the result include latent load?
The result is a simplified sizing estimate and should not replace a full sensible and latent cooling load calculation.
Why does west-facing orientation increase the result?
West-facing rooms often receive stronger afternoon solar gains, so the calculator applies a higher orientation factor.
How should I use the recommended AC capacity?
Use it as an early screening value, then verify equipment selection with manufacturer data and a detailed load calculation.