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Free HVAC Calculators & Tools

Four free tools to size your AC, calculate heat pump savings, estimate SEER upgrade ROI, and check your IRA tax credit — before you talk to anyone.

Built from real pro data
Updated 2025 pricing
No account needed

ProvenQuote is a local services marketplace that builds free tools to help you make informed decisions before hiring a professional. These HVAC calculators are built for consumers — no account required, no upsell, just accurate estimates based on real hvac contractor and utility data. Every tool is updated annually with current pricing and efficiency standards.

After using these tools, you can request a free quote from ProvenQuote’s exclusive, verified HVAC professional for their city. One pro per market — no lead-sharing, no bidding wars. Find your city →

Sizing
Most Used

AC Size Calculator

Calculate the right AC tonnage for your home based on square footage, climate zone, ceiling height, and insulation level.

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Know the numbers before you talk to a pro

The information gap between homeowners and pros is real — but it's fixable. These tools give you the same benchmarks the industry uses, so you can ask better questions and spot a bad quote.

  • Know the right AC tonnage before getting quotes
  • Calculate heat pump savings vs your current system
  • Estimate your IRA tax credit before purchasing
  • Compare SEER ratings in real dollar terms
  • Walk into any quote conversation with your own numbers

HVAC Quick Reference

Average central AC replacement cost$4,500–$8,000
Heat pump installation (typical)$5,000–$10,000
AC sizing rule of thumb1 ton / 500–600 sq ft
SEER upgrade savings (13→18)~28% less electricity
IRA heat pump credit (max)$2,000
Average AC lifespan15–20 years

Doing it yourself?

These guides walk through what pros look for — helpful before hiring or if you're DIYing.

AC Maintenance: DIY vs Pro ChecklistRepair or Replace? When to Call ItHow to Read an HVAC Quote

Frequently Asked Questions

Are these HVAC tools free?
Yes — every tool is 100% free with no sign-up, no email required, and no hidden fees.
What size AC do I need for my home?
AC sizing depends on square footage, climate zone, insulation level, ceiling height, and window area. A rough rule is 1 ton per 500–600 sq ft, but Manual J calculations account for all variables. Use the AC Size Calculator for a more accurate estimate.
How much can I save with a heat pump?
Heat pumps are 2–3x more efficient than electric resistance heating. In mild climates, switching from electric resistance can save $800–1,200/year. In cold climates with gas, savings depend on utility rates. Use the Heat Pump Savings Calculator to estimate your specific situation.
What is the IRA tax credit for HVAC?
The Inflation Reduction Act provides up to $2,000 for qualifying heat pump installations and up to $600 for qualifying central AC or furnace upgrades. Income limits may apply. Use the IRA Tax Credit Estimator to see what you qualify for.
Should I repair or replace my AC?
A common rule is the "5,000 rule" — multiply the age of the unit by the repair cost. If the result exceeds $5,000, replacement usually makes more financial sense. Also consider: if your AC is over 12–15 years old, a repair now just delays an inevitable replacement while you keep paying high energy bills on an inefficient system.
What SEER rating should I buy?
The federal minimum in most of the US is SEER 14–15. SEER 16–18 offers a meaningful efficiency improvement with a payback period of 4–7 years in hot climates. SEER 20+ is worth considering if you run AC heavily (e.g., Texas, Florida, Arizona). Use the SEER Savings Calculator to run your specific numbers.

These tools are built for anyone planning a project. Professionals have their own suite on ProvenQuote.ai.

HVAC contractor? List your business on ProvenQuote →

This page covers

HVAC calculatorAC size calculatorheat pump savings calculatorSEER calculatorIRA tax credit HVACHVAC toolsfree HVAC calculatorAC sizing tool

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