Free checklist
Checklist for buying a new HVAC system
Print it, take it to every quote, and tick it off before you sign.
Written by HYRE HVAC Research Desk Primary-source research, data analysis and fact checking
The short version
This checklist for buying a new HVAC system covers what to get in writing before you sign: a Manual J load calculation, a matched system with an AHRI certificate, a plan for the ducts, the permit, the refrigerant type and the warranty terms.
A quote that skips these is hard to compare and easy to regret.
Why use a checklist when buying HVAC?
Most bad HVAC purchases are not bad equipment. They are the wrong size, a mismatched coil, leaky ducts left as they were, or a quote so vague it cannot be compared with another. Each item below turns a verbal promise into something written that you can check.
Before you ask for quotes
Fuel, system type, age and any problem rooms. The system age lookup helps.
Comfort, bills, noise, humidity or a failed part. It changes what you buy.
Some programs need approval before work starts. See the rebate finder.
25C does not apply to systems placed in service after December 31, 2025.
What every written quote should include
The size should come from your house, not the old unit.
Outdoor unit, indoor coil or air handler, furnace, thermostat.
Confirms the matched combination and its certified rating in the AHRI directory.
Inspect, seal, modify or replace, with what is included.
Who pulls the permit and books the inspection.
New systems use lower-GWP refrigerants. Ask which one.
Parts, labour, registration, and who handles claims.
Airflow, charge and gas pressure measured and recorded.
Check it with your state board.
Red flags
DOE’s field review found oversizing common.
You cannot compare it to anything.
A fair offer will still be there tomorrow.
How to compare quotes
Run each bid through the HVAC quote checker, then put them side by side with the quote comparison worksheet. For what drives the price, see HVAC cost guides.
Questions
How many HVAC quotes should I get?
What is an AHRI certificate?
Do I need a permit for a new HVAC system?
Is the biggest system the safest choice?
Written and audited by
HYRE HVAC Research Desk
Primary-source research, data analysis and fact checking
We are a research desk, not a sales floor. We read the federal microdata file, the statute or the manufacturer data sheet ourselves, and we publish the figure with the document it came from and the date we retrieved it.
Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify.
The counts below are generated from the published pages themselves, last counted October 26, 2026, and they are what we have actually published rather than what we intend to.
- 18
- studies published
- 15
- federal sources read and cited
- 15
- studies published with their full dataset as CSV
- 51
- jurisdictions reproduced against EIA’s own tables
How this desk works
- Primary sources only. Federal data comes from the agency that collects it, in the file that agency publishes. We do not cite an article that cites a source; we download the source and compute the figure ourselves.
- We validate against the agency before we publish. First, we use each federal microdata file to reproduce the agency’s own published tables. Our cooling research reproduces EIA’s state estimates and standard errors for all 51 jurisdictions. That check caught a variance formula that was off by a factor of four.
- Every estimate carries its uncertainty. These are survey figures, not counts. Standard errors are computed from the replicate weights the federal file supplies and printed beside the estimate. An estimate too imprecise to publish is reported as such rather than printed.
- Nothing is typed by hand. Prose, tables and charts all read from one dataset built by script, so a number in a sentence and the same number in the table below it cannot disagree.
- We publish the data, not just the conclusion. 15 of our 18 studies offer the full computed table as a CSV download on the page, so you can check the analysis or disagree with it. A study without a row-level dataset gets no download link and claims none in its structured data.
- We correct in public. Where we have published a figure wrongly we fix the figure, rewrite any analysis that rested on it rather than patching the number underneath it, and leave a dated correction note on the page.
- We do not install or sell HVAC equipment, and we take no payment for placement, ranking or a favorable mention. Nobody buys a position on this site.
Data as of Sources checked October 26, 2026. Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.
Sources & retrieval dates
Ready to compare quotes?
Tell us the job and your zip code. Contractor matching is still being built, so this is an inquiry, not a booking or a service call.
HyreHVAC is a publisher. We do not install, repair or inspect HVAC equipment and hold no contractor licence. Nothing here replaces an on-site diagnosis by a licensed contractor. Sources are cited with the date they were checked.