# 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 System Lifespan Calculator](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 Calculate the Right AC Efficiency Rating (SEER2) for Your Home Size and Climate](https://hvacsizecalc.com/how-to-calculate-the-right-ac-efficiency-rating-seer2-for-yo/)
- [Heat pump sizing and capacity calculator for Oregon homes transitioning from air conditioning](https://hvacsizecalc.com/heat-pump-sizing-and-capacity-calculator-for-oregon-homes-tr/)
- [7 Proven Fixes for AC Not Cooling Your House in 2026](https://hvacsizecalc.com/7-proven-fixes-for-ac-not-cooling-your-house-in-2026/)
- [The Complete Guide to Reading Your AC Unit Nameplate in 2026](https://hvacsizecalc.com/the-complete-guide-to-reading-your-ac-unit-nameplate-in-2026/)
- [How to Determine if a Heat Pump is Right for Your Home: Sizing and Energy Efficiency Calculator Guide](https://hvacsizecalc.com/how-to-determine-if-a-heat-pump-is-right-for-your-home-sizin/)
- [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/)
- [AC sizing guide for UK climate: when you need it and energy-efficient options](https://hvacsizecalc.com/ac-sizing-guide-for-uk-climate-when-you-need-it-and-energy-e/)
- [Tax Credits and Rebates for HVAC Systems: Heat Pumps, Air Conditioners, and Home Insulation in 2024](https://hvacsizecalc.com/tax-credits-and-rebates-for-hvac-systems-heat-pumps-air-cond/)
- [The Complete Guide to Heat Pump vs Furnace Heating in 2026](https://hvacsizecalc.com/the-complete-guide-to-heat-pump-vs-furnace-heating-in-2026/)
- [5 Essential Through-the-Wall AC Units Sizing Tips for 2026](https://hvacsizecalc.com/5-essential-through-the-wall-ac-units-sizing-tips-for-2026/)
- [How to Size Your Air Conditioner for Extreme Heat: A Sudbury Homeowner’s Guide](https://hvacsizecalc.com/how-to-size-your-air-conditioner-for-extreme-heat-a-sudbury/)
- [The Complete 2026 Guide to HVAC Sizing for Humid Climate Dehumidification](https://hvacsizecalc.com/the-complete-2026-guide-to-hvac-sizing-for-humid-climate-dehumidification/)
- [Evaporator Coil Sizing: 5 Essential Steps for Optimal AC Performance in 2026](https://hvacsizecalc.com/evaporator-coil-sizing-5-essential-steps-for-optimal-ac-performance-in-2026/)
- [HVAC Sizing Guide: How to Calculate the Right System Size for Your Home](https://hvacsizecalc.com/hvac-sizing-guide-how-to-calculate-the-right-system-size-for/)
- [The Ultimate BTU Calculator Guide: Sizing Your HVAC System Correctly](https://hvacsizecalc.com/the-ultimate-btu-calculator-guide-sizing-your-hvac-system-co/)

## 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