# HVAC Size Calc - Free HVAC Load Calculators

> Free HVAC Size Calculators for Homeowners and Contractors
> Written by Derek Holloway. Free calculators, no signup required.

## Pages

- [Blog](https://hvacsizecalc.com/blog/)
- [Calculators](https://hvacsizecalc.com/calculators/)
- [About HVAC Size Calc](https://hvacsizecalc.com/about/)
- [Contact](https://hvacsizecalc.com/contact/)
- [BTU Calculator](https://hvacsizecalc.com/btu-calculator/)
- [AC Unit Size Calculator](https://hvacsizecalc.com/ac-unit-size-calculator/)
- [Furnace Size Calculator](https://hvacsizecalc.com/furnace-size-calculator/)
- [Duct Size Calculator](https://hvacsizecalc.com/duct-size-calculator/)
- [Mini Split Size Calculator](https://hvacsizecalc.com/mini-split-size-calculator/)
- [Heat Pump Size Calculator](https://hvacsizecalc.com/heat-pump-size-calculator/)
- [Privacy Policy](https://hvacsizecalc.com/privacy-policy-2/)
- [HVAC Energy Cost Calculator](https://hvacsizecalc.com/hvac-energy-cost-calculator/)
- [CFM Calculator](https://hvacsizecalc.com/cfm-calculator/)
- [Refrigerant Charge Calculator](https://hvacsizecalc.com/refrigerant-charge-calculator/)
- [Ventilation Calculator](https://hvacsizecalc.com/ventilation-calculator/)
- [Ductwork Sizing Calculator](https://hvacsizecalc.com/ductwork-sizing-calculator/)
- [HVAC Efficiency Calculator](https://hvacsizecalc.com/hvac-efficiency-calculator/)
- [Smart Thermostat Savings Calculator](https://hvacsizecalc.com/smart-thermostat-savings-calculator/)
- [HVAC Age Calculator – Estimate Years Left + Costs [Free]](https://hvacsizecalc.com/hvac-lifespan-calculator/)
- [Indoor Air Quality Calculator](https://hvacsizecalc.com/indoor-air-quality-calculator/)
- [HVAC Energy Savings Calculator](https://hvacsizecalc.com/hvac-energy-savings-calculator/)
- [Air Conditioner Size Calculator](https://hvacsizecalc.com/air-conditioner-size-calculator/)
- [SEER Savings Calculator](https://hvacsizecalc.com/seer-savings-calculator/)
- [HVAC Cost Calculator](https://hvacsizecalc.com/hvac-cost-calculator/)
- [Refrigerant Charge Calculator](https://hvacsizecalc.com/refrigerant-calculator/)

## Blog Posts

- [How to Calculate AC Unit Size for Installation Space and Storage Constraints](https://hvacsizecalc.com/how-to-calculate-ac-unit-size-for-installation-space-and-sto/)
- [Air Conditioner BTU Room Size Guide: How to Size It Right](https://hvacsizecalc.com/air-conditioner-btu-room-size-guide-how-to-size-it-right/)
- [Complete Guide to HVAC Sizing for Radiant Floor Homes in 2026](https://hvacsizecalc.com/complete-guide-to-hvac-sizing-for-radiant-floor-homes-in-2026/)
- [AC Unit Size Calculator: Complete Guide to Choosing the Right Air Conditioner for Your Home](https://hvacsizecalc.com/ac-unit-size-calculator-complete-guide-to-choosing-the-right/)
- [BTU Calculator: The Complete Guide to Sizing Your HVAC System and Estimating Costs](https://hvacsizecalc.com/btu-calculator-the-complete-guide-to-sizing-your-hvac-system-4/)
- [HVAC Sizing 101: A Complete Guide to Calculating the Right System for Your Home](https://hvacsizecalc.com/hvac-sizing-101-a-complete-guide-to-calculating-the-right-sy/)
- [Mini Split Sizing Calculator: Get the Right BTUs Every Time](https://hvacsizecalc.com/mini-split-sizing-calculator-get-the-right-btus-every-time/)
- [The Complete Guide to AC Unit Nameplate Specifications in 2026](https://hvacsizecalc.com/the-complete-guide-to-ac-unit-nameplate-specifications-in-2026/)
- [Heat pump vs electric resistance heating: sizing, efficiency comparison, and cost-benefit calculator for homeowners](https://hvacsizecalc.com/heat-pump-vs-electric-resistance-heating-sizing-efficiency-c/)
- [Heat Pump Sizing Guide: Get the Right BTUs Every Time](https://hvacsizecalc.com/heat-pump-sizing-guide-get-the-right-btus-every-time/)
- [Complete Guide to Humidity Control HVAC Dehumidifiers 2026](https://hvacsizecalc.com/complete-guide-to-humidity-control-hvac-dehumidifiers-2026/)
- [Complete HVAC System Commissioning Guide: 7 Steps in 2026](https://hvacsizecalc.com/complete-hvac-system-commissioning-guide-7-steps-in-2026/)
- [Complete Guide to VRF System Sizing and Zoning in 2026](https://hvacsizecalc.com/complete-guide-to-vrf-system-sizing-and-zoning-in-2026-3/)
- [Is Two-Stage Cooling Worth It? Complete 2026 Guide](https://hvacsizecalc.com/is-two-stage-cooling-worth-it-complete-2026-guide/)
- [How to Size a Furnace: Complete 2026 Calculation Guide](https://hvacsizecalc.com/how-to-size-a-furnace-complete-2026-calculation-guide/)

## Key Facts

- All calculators are free — no account or signup required
- Content written by Derek Holloway
- Updated regularly with current rates, fees, and data
- No personal data collected or stored
- Calculators run client-side in your browser