# 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

- [Free HVAC Size Calculators](https://hvacsizecalc.com/)
- [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/)
- [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

- [Geothermal Heat Pumps: Are They Worth the Investment?](https://hvacsizecalc.com/geothermal-heat-pumps-are-they-worth-the-investment/)
- [How to Calculate the Right AC Size for a Room](https://hvacsizecalc.com/how-to-calculate-the-right-ac-size-for-a-room/)
- [What Is MERV Rating and Which Filter Should You Use](https://hvacsizecalc.com/what-is-merv-rating-and-which-filter-should-you-use/)
- [How to Choose Between Central Air and a Mini-Split System](https://hvacsizecalc.com/how-to-choose-between-central-air-and-a-mini-split-system/)
- [Signs Your HVAC System Is the Wrong Size (and What to Do About It)](https://hvacsizecalc.com/signs-your-hvac-system-is-the-wrong-size-and-what-to-do-about-it/)
- [HVAC Replacement Cost in 2025: What Homeowners Should Expect](https://hvacsizecalc.com/hvac-replacement-cost-in-2025-what-homeowners-should-expect/)
- [What Size HVAC Do I Need? Manual J Load Calculation Explained](https://hvacsizecalc.com/what-size-hvac-do-i-need-manual-j-load-calculation-explained/)
- [How to Size an HVAC System for Your Home: A Complete Guide](https://hvacsizecalc.com/how-to-size-an-hvac-system-for-your-home-a-complete-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