HVAC Calculators
High-intent domain calculators designed for HVAC operations, benchmarking, and calculations.
HVAC Duct Sizing & Air Velocity Calculator
Size round and rectangular supply and return ducts based on CFM and friction rate.
Residential & Commercial Heat Load (Manual J) Tonnage Calculator
Estimate residential cooling and heating heat loss/gain in BTU/hr and required HVAC air conditioning tonnage.
Sensible Heat Ratio (SHR) & Enthalpy Airflow Calculator
Calculate Sensible Heat Ratio (SHR) from sensible and latent heat loads to design coils and dehumidification performance.
Total External Static Pressure (TESP) & Blower Fan Drop Calculator
Measure air handler blower performance by calculating Total External Static Pressure (TESP) across return and supply plenums.
Electric Heat Strip kW to BTU/hr & Amp Draw Calculator
Convert electric heat strip kilowatt (kW) ratings into thermal heating BTU/hr output and electrical breaker ampacity.
SEER2 vs SEER Energy Efficiency Cost Savings Calculator
Calculate annual electricity utility bill savings and 10-year lifetime ROI when upgrading to higher efficiency SEER2 heat pumps and air conditioners.
Chilled Water Flow Rate GPM & Hydronic Tonnage Calculator
Calculate required hydronic flow rate in Gallons Per Minute (GPM) for commercial chilled water loops and cooling towers.
Refrigerant Line Set Copper Tubing Diameter & Velocity Calculator
Size suction and liquid line copper tubing diameters for R-410A and R-32 systems based on equivalent length and capacity.