HVAC Cooling Load Calculator
Static · formula-only · worked example computed when this page was built · no live data
The HVAC Cooling Load Calculator estimates the cooling load (kW and tons of refrigeration) for a space from area, occupancy, equipment, and climate. Example: for a 150 m² space with 25 people, 15 kW of equipment, at 35 °C outdoor / 24 °C indoor, with a 10% design margin, 3.5 m ceiling height, Cooling load = 38.66 kW, Tons = 10.99 TR, Recommended unit = 14.22 TR (per ASHRAE 62.1 | ASHRAE 90.1 | ASHRAE 55 | ASHRAE 2021 Ch.18).
How it works
Computed from your inputs per ASHRAE 62.1 | ASHRAE 90.1 | ASHRAE 55 | ASHRAE 2021 Ch.18. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (HVAC & Cooling)
Inputs: a 150 m² space with 25 people, 15 kW of equipment, at 35 °C outdoor / 24 °C indoor, with a 10% design margin, 3.5 m ceiling height.
| Result | Value |
|---|---|
| Cooling load | 38.66 kW |
| Tons | 10.99 TR |
| Recommended unit | 14.22 TR |
Computed by WorkHive's calculation engine when this page was built; standard: ASHRAE 62.1 | ASHRAE 90.1 | ASHRAE 55 | ASHRAE 2021 Ch.18.
How to use this calculator
- Read the worked example. It uses a 150 m² space with 25 people, 15 kW of equipment, at 35 °C outdoor / 24 °C indoor, with a 10% design margin, 3.5 m ceiling height and shows every number in the method.
- Follow the formula with your own figures: it returns Cooling load, Tons, Recommended unit, computed per ASHRAE 62.1 | 90.1 | 55 | Fundamentals.
- To compute interactively, open the HVAC Cooling Load Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is an HVAC cooling load calculator kW TR?
The HVAC Cooling Load Calculator is a free online tool that estimates the cooling load (kW and tons of refrigeration) for a space from area, occupancy, equipment, and climate. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following ASHRAE 62.1 | 90.1 | 55 | Fundamentals. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive HVAC Cooling Load Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.