How to find and check the AHRI certificate number for your heat pump

An AHRI Certified Reference Number identifies one specific combination of equipment — an outdoor unit matched with a particular indoor coil and air handler — and it is the thing that carries the efficiency ratings the manufacturer stands behind. If a quote does not have one, the efficiency on that quote has not been pinned down.

Why the number matters more than the brand

A heat pump is not rated on its own. The outdoor unit is tested as part of a system, and the resulting HSPF2 and SEER2 belong to that system. In the EPA's ENERGY STAR list of certified ducted heat pumps, 2,444 of 5,521 outdoor models (44.3%) appear at more than one HSPF2 depending on which indoor unit they are paired with. The AHRI reference number is what tells you which of those ratings is yours.

That is also why "a 9.5 HSPF2 heat pump" is not a complete statement. The outdoor model might be certified anywhere from 8.0 to 11.0 across its pairings. The number on your certificate is the one that counts.

Where the numbers appear on a quote

Step 1 — collect the three model numbers

Before you can look anything up, you need, written down exactly:

• The outdoor unit model number. On the data plate on the side of the outdoor unit, and it should be on the quote. Manufacturers often print wildcards in published model numbers — asterisks standing for colour, voltage or minor variants that do not change performance — so the number on your unit may have characters where a catalogue shows an asterisk.
• The indoor coil model number. This is the part most often missing from a quote, and it is the one that moves the rating.
• The air handler or furnace model number, if the system has one. A coil sitting on a furnace is a different certified combination from the same coil in an air handler.

Step 2 — ask for the AHRI reference number

Ask in writing: "What is the AHRI Certified Reference Number for the exact combination you are quoting?" A contractor who has specified a matched system will have it, because it is what they use to claim the efficiency and what rebate programs ask for.

If the answer is that they will work it out later, that is worth pausing on. Not because anyone is being dishonest — a coil is sometimes chosen at install — but because until it is chosen, the efficiency and therefore the running cost on the quote are a range rather than a number. You can see the size of that range for your outdoor unit in the calculator.

Step 3 — look it up yourself

The AHRI Directory of Certified Product Performance is free and public. You can search it two ways: by the AHRI Certified Reference Number, or by model number if you do not have the reference number yet. Select the matched system and the directory generates a Certificate of Product Ratings — a PDF with the certified performance figures for that combination.

If searching by model number returns nothing, try a shorter portion of the number. The directory matches on partial strings, and wildcard characters from a brochure will not match literally.

A real example you can check

Here are two certified pairings of the same outdoor unit, the Trane 5TWX7024A1, from the EPA's ENERGY STAR list. Type either AHRI number into the directory and you should find the same combination and ratings.

Same outdoor unit, same brand, one line apart on a quote — and a different certified efficiency. That difference is why the reference number, not the outdoor model, is the thing to check.

Step 4 — check the certificate against the quote

Four things to compare:

1. The model numbers on the certificate are the ones on your quote. All of them, not just the outdoor unit.
2. The HSPF2 and SEER2 match what you were told. If the quote claims a number the certificate does not show, ask which combination that number came from.
3. The certificate is active. Certificates can be superseded when ratings are re-filed.
4. Cold-climate status, if that matters where you live. Like efficiency, it is a property of the combination. The same outdoor unit can have some pairings certified as cold-climate and others not. The EPA's ENERGY STAR Product Finder shows ENERGY STAR and cold-climate status for certified heat pumps.

To take these questions to your installer, use the printable checklist.

One thing the certificate does not do

It does not predict your bill. HSPF2 is measured under a standardised laboratory procedure at reference conditions. Your actual consumption depends on your climate, how the system is sized, how well the ducts are sealed, the thermostat settings and how the installer commissioned it. The certificate tells you what the equipment did on a test stand under defined conditions, which is exactly what you need to compare two quotes fairly — and no more than that.

Related

• Why one outdoor unit has several HSPF2 ratings
• What to check on a heat pump quote
• Look up your model and its certified pairings

Sources

• AHRI Directory of Certified Product Performance, and its technical support pages on searching by reference or model number and generating a certificate.
• ENERGY STAR and cold-climate status: EPA ENERGY STAR Product Finder, certified heat pumps.
• Counts of models and ratings: U.S. EPA, ENERGY STAR Certified Ducted Heat Pumps, retrieved 2026-09-26.

By Adrián Criado · About the author and this dataset · Updated 2026-09-26