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All HVAC Calculators

Browse our comprehensive suite of 42+ tools designed for HVAC professionals. Select a calculator to get started.

BTU Load Calculator
Estimate heating and cooling BTU requirements for a room or building.
AC Sizing Calculator
Determine the appropriate air conditioner size (tons) for your space.
Furnace Sizing Calculator
Determines appropriate furnace capacity based on heating load.
Boiler Sizing Calculator
Calculates required boiler capacity for hydronic heating systems.
Heat Pump Sizing Calculator
Determines the correct size for heat pump systems.
Ventilation Load Calculator
Calculates fresh air requirements (e.g., CFM/person, CFM/sq.ft).
Make-Up Air Calculator
Determines make-up air needed for exhaust systems.
Humidity Control Sizing
Sizes humidifiers or dehumidifiers for desired humidity levels.
Ductwork Sizing Calculator
Calculate optimal duct sizes for efficient airflow and system performance.
CFM Calculator
Determine required airflow (CFM) for ventilation and air changes.
Air Change Rate (ACH) Calculator
Calculates air changes per hour for a space.
Duct Friction Loss Calculator
Estimates pressure drop in ductwork sections due to friction.
Fan Law Calculator
Applies affinity laws to predict fan performance changes.
Grille & Diffuser Sizing
Helps select appropriate air distribution grilles and diffusers.
Static Pressure Calculator
Estimates total static pressure for fan selection.
Refrigerant Charge Calculator
Calculate the correct refrigerant charge amount for various AC systems.
Pump Head Calculator
Calculates total dynamic head for hydronic system pumps.
Expansion Valve Sizing
Aids in selecting correctly sized thermal expansion valves (TXV/EXV).
Coil Performance Calculator
Estimates sensible and latent heat transfer of coils.
Compressor Efficiency Calculator
Calculates EER or COP for compressors.
Energy Cost Calculator
Estimate annual energy costs for HVAC systems and compare efficiencies.
Efficiency Payback Calculator
Compares payback period for different SEER/EER/HSPF units.
System ROI Calculator
Estimates Return on Investment for new HVAC systems.
Life Cycle Cost Calculator
Calculates total cost of ownership for HVAC equipment.
Electricity Bill Estimator
Estimate your monthly and annual electricity costs for running an HVAC system.
Wire Size Calculator
Determines appropriate electrical wire gauge for HVAC components.
Ohm's Law Calculator
Basic V=IR calculations for electrical circuits.
Motor Amperage Calculator
Estimates Full Load Amps (FLA) or Running Load Amps (RLA).
Dew Point Calculator
Calculates dew point temperature from air conditions.
Wet Bulb Temperature Calculator
Calculates wet bulb temperature from air conditions.
Relative Humidity Calculator
Determines relative humidity from air properties.
Moist Air Enthalpy Calculator
Calculates the total heat content of moist air.
Solar Panel Savings Calculator
Estimate savings from installing solar panels, including tax credits.
Insulation Savings Calculator
Estimate annual energy savings, cost reductions, and CO2 offset from upgrading insulation.
Water Pipe Sizing Calculator
Sizes pipes for hydronic heating and cooling systems.
Gas Pipe Sizing Calculator
Determines correct pipe sizes for natural gas or propane lines.
Refrigerant Line Sizing
Sizes suction, liquid, and discharge refrigerant lines.
ASHRAE Ventilation Calculator
Calculates ventilation rates based on ASHRAE 62.1/62.2.
Kitchen Hood CFM Calculator
Determines exhaust airflow for commercial kitchen hoods.
Insulation Calculator
Calculate the required insulation thickness, area, and estimated costs based on your target R-value and area type.
Water Heater Size Calculator
Calculate the optimal water heater size (tank gallons or tankless GPM) for your household.
Tankless vs Tank Calculator
Compare long-term costs of tankless vs traditional tank water heaters.