HeatMath publishes free calculators and plain-English guides for American homeowners who are deciding how to heat and cool their homes. We focus on the questions that cost real money: what a heat pump or furnace costs to install, what it will cost to run, and what size you actually need.
Why we built it
Most heating and cooling advice online is written to sell a specific product or to capture a lead for an installer. We wanted a place where you can put in your own home and your own utility prices and see the numbers for yourself before anyone quotes you a price.
Who is behind HeatMath
HeatMath is written and built by Juan Chousa, who runs an online appliance spare-parts business and works every day with appliance and heating equipment repairs, parts and technical documentation. He writes the guides and builds the calculators.
How we research
- Calculators use standard engineering values: the energy content of each fuel, AFUE, SEER2, HSPF2 and COP ratings, and heating degree days. Every formula is shown on the calculator page.
- Price ranges come from published 2026 cost surveys and manufacturer data, cross-checked across several sources. Prices vary a lot by region, so we give ranges, not single numbers.
- Rules and incentives, such as federal tax credits and efficiency minimums, are checked against official sources and updated when they change.
Our independence
HeatMath is supported by advertising. Advertisers do not choose what we write about and do not see articles before they are published. We do not accept payment for recommendations.
Found a mistake?
If a number looks wrong or a rule has changed, please tell us through the contact page. We correct errors quickly and note significant changes on the page.