# 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

- [Two-Stage Cooling Explained: 5 Essential Facts for 2026](https://hvacsizecalc.com/two-stage-cooling-explained-5-essential-facts-for-2026/)
- [5 Costly Consequences of Undersized HVAC Systems in 2026](https://hvacsizecalc.com/5-costly-consequences-of-undersized-hvac-systems-in-2026/)
- [Window AC vs Central Air: 5 Cheaper Picks for 2026](https://hvacsizecalc.com/window-ac-vs-central-air-5-cheaper-picks-for-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-3/)
- [Scroll vs Rotary Compressor Sizing: 5 Essential Facts for 2026](https://hvacsizecalc.com/scroll-vs-rotary-compressor-sizing-5-essential-facts-for-2026/)
- [BTU Calculator: The Complete Guide to Sizing Your HVAC System Correctly](https://hvacsizecalc.com/btu-calculator-the-complete-guide-to-sizing-your-hvac-system-3/)
- [HVAC Sizing Guide: How to Calculate the Right System for Your Home](https://hvacsizecalc.com/hvac-sizing-guide-how-to-calculate-the-right-system-for-your/)
- [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/)

## 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