# 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/)
- [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/)
- [HVAC Load Calculator](https://hvacsizecalc.com/hvac-load-calculator/)

## Blog Posts

- [How to Size HVAC Systems for Different Climate Zones in Southern Ontario](https://hvacsizecalc.com/how-to-size-hvac-systems-for-different-climate-zones-in-sout/)
- [Ductwork Sizing Calculator: Get the Right CFM Every Time](https://hvacsizecalc.com/ductwork-sizing-calculator-get-the-right-cfm-every-time/)
- [Two-Stage Cooling Explained: Is It Worth It in 2026?](https://hvacsizecalc.com/two-stage-cooling-explained-is-it-worth-it-in-2026/)
- [7 Proven Fixes When Your AC Is Not Cooling Your House in 2026](https://hvacsizecalc.com/7-proven-fixes-when-your-ac-is-not-cooling-your-house-in-2026/)
- [Demand-Controlled Ventilation: The Complete 2026 HVAC Sizing Guide](https://hvacsizecalc.com/demand-controlled-ventilation-the-complete-2026-hvac-sizing-guide/)
- [The True Cost of HVAC Repair vs Replacement: 5 Essential Facts for 2026](https://hvacsizecalc.com/the-true-cost-of-hvac-repair-vs-replacement-5-essential-facts-for-2026/)
- [Modulating Furnaces: 5 Proven Efficiency Benefits and Sizing Advantages in 2026](https://hvacsizecalc.com/modulating-furnaces-5-proven-efficiency-benefits-and-sizing-advantages-in-2026/)
- [How to Read Your AC Unit Nameplate: The Complete 2026 Guide](https://hvacsizecalc.com/how-to-read-your-ac-unit-nameplate-the-complete-2026-guide-2/)
- [How Climate Resilience Programs Impact HVAC Sizing and Cooling Demand in Urban Areas](https://hvacsizecalc.com/how-climate-resilience-programs-impact-hvac-sizing-and-cooli/)
- [How to Read Your AC Unit Nameplate: The Complete 2026 Guide](https://hvacsizecalc.com/how-to-read-your-ac-unit-nameplate-the-complete-2026-guide/)
- [How to Size a Furnace for Your Home: Complete 2026 Guide](https://hvacsizecalc.com/how-to-size-a-furnace-for-your-home-complete-2026-guide/)
- [Complete Guide to HVAC Zoning Systems: Room-by-Room Control in 2026](https://hvacsizecalc.com/complete-guide-to-hvac-zoning-systems-room-by-room-control-in-2026/)
- [Complete Guide to VRF System Sizing and Zoning in 2026](https://hvacsizecalc.com/complete-guide-to-vrf-system-sizing-and-zoning-in-2026-2/)
- [Complete Guide to Humidity Control HVAC Dehumidifiers in 2026](https://hvacsizecalc.com/complete-guide-to-humidity-control-hvac-dehumidifiers-in-2026-2/)
- [Complete Guide to R-22, R-410A & A2L Refrigerants 2026](https://hvacsizecalc.com/complete-guide-to-r-22-r-410a-amp-a2l-refrigerants-2026/)

## 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