Free HVAC Calculators
Real numbers before a $6,000–$15,000 decision. No email required, no ads, no upsells.
Most Popular
The SEER Savings Calculator shows exactly how much your old AC is costing you vs. a new system — at your specific electricity rate. The Repair vs. Replace Calculator tells you whether to pay that repair bill or put the money toward a new system.
Available Now
SEER Savings Calculator
2 min to completeEnter your current SEER rating and a new system's SEER2 to see exact annual electricity savings at your local rate — with payback period.
Inputs needed
Current SEER, new SEER2, electricity rate, cooling hours
Best for
Anyone comparing new AC systems or curious how much their old system is costing them
AC Repair vs. Replace Calculator
3 min to completeShould you pay for the repair or buy a new system? Enter your repair quote, system age, and efficiency ratings to get a clear recommendation with the math behind it.
Inputs needed
System age, repair cost, current SEER, new system cost, new SEER2, electricity rate
Best for
Homeowners facing a repair bill who want to know if replacement makes more financial sense
SEER to SEER2 Converter
1 min to completeConvert any SEER rating to SEER2 (or back) to compare old and new systems accurately. Includes a quick-reference table for common ratings and a 2026 regional compliance check.
Inputs needed
Your SEER or SEER2 rating, system type (split or mini-split)
Best for
Anyone comparing a pre-2023 system to new quotes, or checking if a quoted system is actually an upgrade
Coming Soon
More tools in development.
Tax Credit & Rebate Estimator
See which state and utility rebates you qualify for based on your location, income, and system type.
AC Sizing Calculator
Estimate the right tonnage for your home based on square footage, climate zone, and insulation.
Why These Calculators Exist
The HVAC industry doesn't make it easy to compare systems objectively. SEER and SEER2 ratings aren't directly comparable. Repair vs. replace decisions involve multiple variables that contractors rarely walk you through. Rebate eligibility varies by state, utility, and income. These tools exist to give you the same analysis a good HVAC engineer would do — in under 5 minutes, for free.