How we research and compare HVAC warranties.
Last updated October 17, 2026
- Every number in a Noble guide names its source, and we record the date we checked it.
- A company's warranty terms come only from that company's own website or warranty document, and an equipment brand's terms come only from that brand's own warranty page.
- In a comparison, Noble is one row with the same columns as every other option. We never rank ourselves first.
- The Noble Team reviews each guide before it publishes.
Why we publish our method
Noble Administration Network administers a lifetime warranty program for residential HVAC systems, so we have an interest in the topics we write about. That's the reason this page exists. You should be able to see where every fact in our guides comes from, how we check it, and how we keep a comparison fair when one of the options is ours.
Where our facts come from
We use five kinds of source, and each guide names the ones it used next to the fact they support.
- Equipment manufacturers' own pages. Warranty terms, registration deadlines, and transfer rules come from the brand's own warranty page, registration page, or warranty certificate, never from a reseller or a summary.
- Government and standards bodies. Rules and data come from the agencies that publish them, such as the FTC on written warranties, the EPA on refrigerants, the IRS on tax credits, and ENERGY STAR on replacement.
- Published cost guides. Prices come from named, dated cost guides and manufacturers' pricing guides. We show them as ranges, because one number can't describe every home and every market.
- Other warranty companies' own websites. When a guide names another warranty program, every fact about it comes from that company's own site, with a link.
- Noble's own program terms. What Noble's warranty covers and who backs it comes from Noble's program details booklet and the program page.
How we check and date the numbers
We open each source on the day we write or update a guide, record the exact wording it uses, and link it in the article. A fact we can't confirm on its source that day gets cut, not softened.
- Comparison tables carry the month we checked them, for example "Checked October 2026".
- Costs appear as ranges from named sources, with the source's date where it shows one.
- When two sources disagree, we show both and say what each one measures, rather than pick the number that suits the story.
- When a company's page doesn't state something, the table says "Not stated on its site". We don't guess.
- Manufacturer warranty terms often vary by model and product line, so we say which line we checked and point you to your own model's certificate.
How we keep comparisons neutral
Our comparison guides teach you how to choose, and five rules keep them fair to every option.
- Every option is described with the same columns, so you can compare like with like.
- Options are listed by type or in alphabetical order, never ranked from best to worst.
- Noble appears as one row, described from its own published terms, and it is never listed or ranked first because it is ours.
- We describe other companies by what their own sites say, and we don't run anyone down.
- We say when another kind of coverage may fit you better, for example a home warranty plan on an older system.
You can see the method at work in our guide to the four types of HVAC warranty and our comparison of HVAC warranty programs for contractors.
Who reviews our guides
The Noble Team reviews each guide before it publishes. Every guide cites its sources and the date we checked them, so you can check any fact yourself.
How and when we update
When the content of a guide changes, the "Updated on" date at the top of the guide changes with it. Our guides carry no affiliate links and no paid placements.
If you find a fact that's wrong or out of date, email info@nobleadminnetwork.com with the page and the fact. We check it against the source, correct the guide when it's wrong, and update its date.