Cooling Load Estimator (Component Method)
Room-by-room sensible load from walls, roof, glass, people and equipment with U-values.
Glass usually dominates: 4 m² of unshaded glazing gains more than 30 m² of brick wall. Shading beats tonnage.
Formula
Note: Screening tool. Latent, orientation-by-orientation solar and diversity need a full load program.
Cooling Load Estimator (Component Method) is a free cooling load calculation for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Cooling Load Estimator (Component Method)
Room-by-room sensible load from walls, roof, glass, people and equipment with U-values. The calculation implements Q = Σ U·A·ΔT + solar gain + internal gains (ASHRAE Fundamentals — nonresidential load calc (RTS simplified)). Glass usually dominates: 4 m² of unshaded glazing gains more than 30 m² of brick wall. Shading beats tonnage.
How to use Cooling Load Estimator (Component Method)
- 1Enter Exposed wall area in m².
- 2Enter Wall U-value in W/m²K (230mm brick ≈ 2.0 · insulated ≈ 0.5).
- 3Enter Roof area (0 if not top floor) in m².
- 4Enter Glass area in m².
- 5Read Sensible load, Tonnage (with 25% latent/safety) instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Cooling Load Estimator (Component Method)?
- ✓Implements the standard formula — Q = Σ U·A·ΔT + solar gain + internal gains
- ✓Reference cited on-page: ASHRAE Fundamentals — nonresidential load calc (RTS simplified)
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Cooling Load Estimator (Component Method) use?+
It computes Q = Σ U·A·ΔT + solar gain + internal gains, per ASHRAE Fundamentals — nonresidential load calc (RTS simplified). The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Glass usually dominates: 4 m² of unshaded glazing gains more than 30 m² of brick wall. Shading beats tonnage. Note: Screening tool. Latent, orientation-by-orientation solar and diversity need a full load program.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Cooling Load Estimator (Component Method) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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