HVAC Tools
Discover free HVAC tools, calculators, and converters for airflow, duct sizing, refrigerant calculations, load estimation, and HVAC system planning.
All Tools
Hvac Seer2 Energy Savings Calculator - Compare Costs
Estimate HVAC energy use and savings from SEER2 ratings using cooling load, efficiency, and electricity cost inputs for clearer equipment comparisons.
Hvac Duct Cfm Calculator For Flexible Duct - Cfm Tool
Calculate flexible duct CFM from duct diameter and air velocity. Estimate airflow quickly in cubic feet per minute for HVAC duct planning and sizing.
Hvac Refrigerant Charge Calculator By Weight Online
Calculate HVAC refrigerant charge by weight using system target and current charge in lb or kg. Estimate refrigerant to add with a clear charge summary.
Hvac Return Air Grille Size Calculator - Cfm Tool
Calculate HVAC return air grille size from CFM, face velocity, and free area. Get required grille area plus practical sizing guidance for HVAC returns.
Hvac Electricity Cost Calculator By Zip Code - Energy Cost
Calculate HVAC electricity use and monthly cost by ZIP code with HVAC power, hours per day, days per month, and electricity rate. Review kWh and cost.
Hvac Heat Pump Balance Point Calculator - Thermal Point
Use the HVAC Heat Pump Balance Point Calculator to estimate outdoor balance temperature from building heat loss and heat-pump heating capacity data.
Hvac Air Changes Per Hour Calculator - Online Tool
Calculate HVAC air changes per hour from room dimensions and airflow. Use the ACH formula to estimate ventilation rates for HVAC planning.
Hvac Heat Load Calculator For Server Room | Toolhox
HVAC Heat Load Calculator for Server Room estimates cooling requirements from applicable server-room heat loads for preliminary HVAC capacity planning.
Hvac Gas Pipe Size Calculator Online - Pipe Sizing Tool
Use the HVAC Gas Pipe Size Calculator Online to estimate pipe size from appliance load and pipe length, then check sizing assumptions.
Hvac Troubleshooting Symptom Checker Online | Toolhox
Use the HVAC Troubleshooting Symptom Checker Online to match common heating and cooling symptoms with likely causes, practical checks, and next steps.
Hvac Maintenance Cost Estimator For Homeowners - Free
Estimate routine HVAC maintenance costs for your home by organizing service needs, recurring upkeep, and homeowner inputs into a practical cost estimate.
Hvac Duct Sizing Tool For Homeowners - Duct Calculator
Estimate residential HVAC duct sizes from airflow and design inputs. Review friction rate, velocity, duct shape, and sizing limits before installation or remodeling.
Hvac Furnace Btu Calculator For Basement - Estimate Size
Estimate basement HVAC furnace BTU needs from area, climate, insulation, and efficiency, then use the result as a preliminary sizing guide before Manual J review.
Hvac Blower Motor Speed Calculator - Pulley Rpm
Calculate HVAC blower RPM from motor speed and pulley diameters. Check belt-drive speed ratios and estimate blower RPM for HVAC setup and service.
Hvac System Efficiency Comparison Tool - Compare Systems
Compare HVAC system efficiency, energy use, and lifecycle costs to evaluate system options using EER, IEER, SEER, and COP before making an early design choice.