Latent Heat Load
Use the Latent Heat Load. Enter Airflow (CFM) and Humidity ratio difference for a clear result, formula explanation, and practical planning checks.
Latent Heat Load measurements
Enter your values, then calculate.
Result
How to calculate latent heat load
This calculator finds latent heat load — the cooling load associated with removing moisture from the air, as opposed to sensible (temperature-only) cooling load.
How the calculation works
Latent heat load = 4840 × Airflow (CFM) × Humidity ratio difference. The 4840 constant is a standard psychrometric conversion factor for this calculation in imperial units.
Example
400 CFM airflow with a humidity ratio difference of 0.004: Latent load = 4840 × 400 × 0.004 ≈ 7,744 BTU/hr.
Frequently asked questions
How is Result calculated?
Result = 4840 × [Airflow] × [Humidity ratio difference].
Is the Latent Heat Load free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Latent Heat Load
Latent heat load = 4840 × Airflow (CFM) × Humidity ratio difference. The 4840 constant is a standard psychrometric conversion factor for this calculation in imperial units.
Let's understand your latent heat load result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Latent Heat Load
- Total cooling load is the sum of sensible (temperature) and latent (moisture) loads — this calculates only the latent portion.
- High-humidity climates and spaces (like gyms, kitchens) have proportionally higher latent loads relative to sensible loads compared to dry climates.
Common Latent Heat Load Mistakes to Avoid
- Treating this latent load figure as the total cooling load, when it needs to be added to the separately calculated sensible load for total system sizing.
When to Use This Calculator
This calculator finds latent heat load — the cooling load associated with removing moisture from the air, as opposed to sensible (temperature-only) cooling load.