Formula & worked example
Qlat=ṁdry·(Wout−Win)·hfg.
1,000 CFM at 1.2 kg/m³ with ΔW=0.008 kg/kg produces about 13.3 kW latent load.
HVAC engineering calculator · Updated Sep 17, 2026
Ventilation Latent Load Calculator — Outdoor Air Moisture & Tons
Calculate latent HVAC load from outdoor-air flow and indoor/outdoor humidity ratio, with moisture removal in kg/h and latent capacity in kW, BTU/h and tons.
Inputs
Live result
Dry-air mass flow 0.56633694 kg/s
Moisture load 16.310504 kg/h
Latent load 11.100204 kW
Latent load 37,875.468 BTU/h
Cooling tons 3.156289 ton
Assumptions & limits
- Positive output represents dehumidification demand.
- Dry-air density and latent heat are explicit inputs.
Frequently asked questions
What does this Ventilation Latent Load Calculator calculate?
Calculate latent HVAC load from outdoor-air flow and indoor/outdoor humidity ratio, with moisture removal in kg/h and latent capacity in kW, BTU/h and tons.
Is this suitable for final equipment selection?
Use it as an auditable engineering cross-check. Final selections should use measured design conditions, manufacturer data, applicable standards and local code.
Why does MAXScanner expose the assumptions?
HVAC shortcuts can hide density, pressure, concentration and effectiveness assumptions. Exposing them makes the result easier to verify and revise.