HVAC Fundamentals Calculators

Calculate sensible heat in BTU/h and kW from airflow and temperature difference using Q = 1.08 × CFM × ΔT, with metric inputs.

Calculate latent (moisture) heat load from airflow and humidity ratio difference in grains per pound: Q = 0.68 × CFM × Δgr.

Calculate total (sensible + latent) heat from airflow and enthalpy difference: Q = 4.5 × CFM × Δh. Includes tons and kW.

Calculate heat energy from mass, specific heat and temperature change. Results in kJ, BTU and kWh.

Estimate kWh and electricity cost for HVAC equipment from power draw, run hours and your utility rate.

Convert between COP, EER and kW per ton for air conditioners, heat pumps and chillers, with notes on SEER/SEER2.