AHRI Directory Lookup: Verify the System on Your Bid

Put five characters of a condenser model number in the AHRI Directory's Outdoor Unit Model Number box and the answer comes back as a crowd. GSXN4 returns Results: 22535 Records. Narrow it to one two-ton outdoor model, GSXN402410A, and the count is still 4,406: a single outdoor unit, thousands of certified combinations, with a SEER2 column running from 12.0 to 15.2 down the first 250 rows the search hands back. Two searches, no account, public screen, read 19 August 2026.

Your estimate quotes one figure out of that spread. The directory decides which one you are actually buying, and it decides by the pair — the outdoor model and the indoor model sitting on the same row. Running the check takes maybe ten minutes, needs nobody's cooperation, and is the one part of an HVAC estimate you can finish before you sign anything. What follows is that check, field by field, in the directory's own wording.

What the directory certifies is the pair, not the box

A split system is two pieces of equipment sold as a single performance claim. AHRI's Unitary Air-Conditioner Equipment programme covers split systems and also coils "that a coil-only manufacturer rates as a system with other manufacturer's outdoor units that are rated below 65,000 Btu/h cooling," per its own programme page. AHRI's guidance for using the directory calls the reference number "a unique number identifying a condenser and evaporator combination that has been certified by AHRI as properly matched system," and adds that "the best person to obtain a Certified Reference Number for you is your installing contractor."

The scale of the thing is not something you have to take on faith. Press Search on the Air Conditioners screen with every box empty, and the results header reads Results: 3305501 Records, followed by the line (Only the first 100000 records are displayed.) Tick Include Discontinued and Obsolete Records in Search Results and the same empty search returns 12,597,560. The Air-Source Heat Pumps screen gives 957,146 and 2,978,721 the same way.

Those four numbers are programme totals, read on 19 August 2026 — not the number of rows your model number will return, and not counts of models. They count combinations. One condenser occupies thousands of them, which is the entire gap between the SEER2 on a brochure and the SEER2 on your row.

What separates each pair of figures is discontinued and obsolete stock, and the checkbox tooltip says how long the directory keeps it: "Records are searchable for 5 years from their date of discontinuation or obsoletion."

The search screen, field by field

Go to ahridirectory.org. The tile on the home page is labelled Air Conditioning; the screen it opens is headed Air Conditioners, with Certification Program Information: Air Conditioners (AC) under the heading. Its tooltip covers "single package and split systems which may include a heating function (e.g. furnace); air-conditioning coils (and air-handling products with air-conditioning coils); and multi-split systems rated below 65,000 btuh (approximately 5 tons) cooling capacity." Heat pumps have their own tile and their own screen, Air-Source Heat Pumps.

The Search Criteria panel is three rows of boxes. Top row first:

Second row holds the three model-number boxes — Outdoor Unit Model Number, Indoor Unit Model Number, Furnace Model Number — plus a For Service Only Model tickbox. Only enter a furnace if one is part of the rated combination, and note AHRI's condition on it: "For your furnace to be considered in the certification of your AC or HP system, the furnace must be the same brand as your outdoor unit."

Third row is three yes/no filters: ENERGY STAR ® Certified?, Only display records which include a furnace, and Only display records which do not include a furnace. That last pair is the fastest way to halve a result list.

Under all of it sit three links — Show Performance Filters, Show CEE Filters, Show Additional Filters — and then the Search and Clear Search buttons. The Include Discontinued and Obsolete Records in Search Results checkbox is beside the buttons rather than up with the fields, which is why people miss it.

You need no serial numbers for any of this. AHRI's support article on the information required says "You do not need to provide serial numbers. AHRI does not capture serial numbers for any type of equipment in its database," and asks only for outdoor brand and model, indoor brand and model, and the furnace where one is involved.

Type less, not more

One technique turns this from frustrating to routine: enter fewer characters. AHRI's own directory instructions recommend limiting entries "to the first three to five characters," because "manufacturers often change a letter or two in their model numbers from year to year and the database might not reflect those changes," and add that if that fails you "may wish to start over by searching for a string of 3 to 4 contiguous characters from the middle of the model number."

The no-results panel says much the same in its own words. Under "Sorry, we can't find any models that meet your search criteria..." it suggests, in order: double-check the reference and model numbers, drop a few characters from the end of the model number, search on only the first four characters, "search and filter only by brand to see example model numbers for that brand," make sure the unit has an AHRI sticker, and tick the discontinued-and-obsolete box. That last one matters on repair-or-replace bids, where the equipment being matched is already sitting beside your house.

Trailing characters are often not yours to guess anyway. The directory prints them as wildcards — the rows for that two-ton Goodman-family model read GSXN402410A*, asterisk included — because the last character varies with things that do not change the rating.

The columns that decide it

Finding a row is not the check. Reading it is. The air-conditioner results table runs 32 columns, and a line above it explains the shading: "Columns highlighted in blue, with an * indicate AHRI Certified Ratings."

Outdoor Unit Model Number, Indoor Unit Model Number, Furnace Model Number. All three have to match your bid. Not "look like." Match. If your bid names a furnace and the row does not, it is a different combination.

Model Status. Three values, defined in the tooltip. Active is "currently produced AND sold or offered for sale; OR new model that is being marketed but is not yet being produced." Production Stopped is "no longer in production but is still available for sale," and such a model is certified. Discontinued is "no longer in production or available for sale," and the directory states a Discontinued model is not certified. A reference number attached to a discontinued row is not the reassurance it looks like. Certified is also not the same as currently made: on the first 250 rows for that two-ton model, 242 read Production Stopped and 8 read Active.

Manufacturer Type. Either Systems, where "the same manufacturer manufactures all components of the system (outdoor, indoor, furnace)," or Coil (Mix-Match), where "the manufacturer of the indoor unit is different from the manufacturer of the outdoor and furnace." Mix-match is legitimate and common — 21 of those 250 rows — and a problem only when your bid's particular pairing is not one of the certified rows.

Outdoor Unit Brand Name is worth a second look here rather than in the search panel. Those 250 rows, all carrying one outdoor model number, list brand names including GOODMAN, JANITROL, FRANKLIN and several contractor house brands. That is the tooltip's warning made visible: the brand on your bid and the brand in the database can be different words for the same box.

Designated Tested Combination? The "combination that was designated to be tested by the manufacturer to determine ratings" — most rows are rated by calculation from a tested one, and on the page I read the answer was No on every row that carried a value at all, blank on the mix-match rows. Is Rerated, further along the same row, flags a unit that "did not meet the ratings that were originally claimed" and was rerated to tested values. Rare, and worth a question.

Region and Sold In? The Region tooltip says it "indicates where the unit may be sold within the US." That column carries legal weight, which is the next section. Sold In? answers a different question and can read USA, Canada, or both.

SEER2 (Appendix M1), EER2 (95F) (Appendix M1), Cooling Capacity (95F), btuh (Appendix M1). The heat pump list adds HSPF2 (Region IV) (Appendix M1) plus heating capacity at 47°F, 17°F and 5°F and a heating COP at 5°F.

Note that Appendix M1 suffix. The table also carries older columns labelled Appendix M holding plain SEER, EER and HSPF: pre-2023 test-procedure figures, numerically higher. Read the wrong column and you will "confirm" a rating your equipment does not have. SEER2, EER2 and HSPF2 are the metrics under AHRI Standard 210/240-2023, harmonised with DOE's appendix M1 test procedure.

Region is not a marketing label

10 CFR 430.32(c)(5) sets the national minimums for equipment manufactured on or after 1 January 2023: 13.4 SEER2 for split-system air conditioners, 14.3 SEER2 with 7.5 HSPF2 for split-system heat pumps. Paragraph (c)(6) then raises the bar for air conditioners installed in the southeast or southwest: 14.3 SEER2 under 45,000 Btu/h and 13.8 at or above it. In the southwest an EER2 minimum applies as well — 11.7 under 45,000 Btu/h, 11.2 at or above — with both figures dropping to 9.8 once certified SEER2 reaches 15.2. "Southeast" is defined in a footnote as sixteen states plus the District of Columbia, Puerto Rico and the US Territories; "southwest" is Arizona, California, Nevada and New Mexico. Section text retrieved 19 August 2026 from the title 10 edition current as of 17 August 2026.

Then comes the sentence that turns the Region column into an enforcement mechanism rather than a note. Paragraph (c)(6)(ii): "Any model of outdoor unit that has a certified combination with a rating below the applicable standard level(s) for a region cannot be installed in that region. The least-efficient combination of each basic model, which for single-split-system air conditioner (AC) with single-stage or two-stage compressor ... must be a coil-only combination, must comply with the applicable standard."

Read that twice. The test is not applied to your combination. It is applied to the least efficient certified combination of that outdoor unit, and for a single-stage or two-stage split air conditioner the rule names which one that has to be: a coil-only combination. A model can therefore be barred from your region over a pairing nobody intends to install. That is part of why the same condenser gets quoted in Ohio and turns out to be unavailable in Georgia. The heat pump list carries no Region column at all: paragraph (c)(6) reaches only split-system and single-package air conditioners, and heat pump minimums are national.

Four ways a bid fails this check

Nothing to check. The estimate names an outdoor model and says "new coil." No pair, no rating, and the SEER2 printed further down the page is attached to nothing. This is line 5 of the fourteen lines a complete HVAC bid must contain, and the most common gap of all.

The pair exists but the number does not. The row's SEER2 sits below the figure on the bid, because the bid quoted the condenser's best certified combination rather than the one being installed. With a spread like 12.0 to 15.2 sitting under a single outdoor model number, this is not an exotic failure.

The row is Discontinued. Certified once, not certified now, by the directory's own definition.

The pair does not exist. Sometimes a corrected model number resolves it in one more search. Sometimes a substitution has already been decided and not written down.

One filter earns its own mention on condenser-only replacements. For Service Only Model records are, per the tooltip, outdoor units "not distributed in commerce for new system installations" that "may be serviced or installed as a like-in-kind outdoor unit only replacement." If someone proposes to swap the outdoor unit and leave your coil in place, that is the phrase to look for.

Sending the question back, in five lines

Ask in writing. The answer joins the record, and how long it takes to arrive is itself information.

1. The AHRI Certified Reference Number for the combination you are quoting.
2. Outdoor, indoor, and furnace model numbers exactly as they appear in that directory row.
3. The SEER2, EER2, and where applicable HSPF2 shown on that row, not from the brochure.
4. The Model Status shown on that row.
5. Confirmation that the row's Region permits installation at my address.

If the reply contains a changed model number, that is a substitution, and a substitution after signing is a change order: the clause that reopens a fixed price covers what has to be written down. Where the substituted outdoor unit carries a higher minimum circuit ampacity than the one you priced, the electrical side moves too, which is where running your own load calculation stops being academic.

What the check settles, and what it does not

Two searches and a screenshot convert most of the equipment section of an estimate from a claim into a row you can point at. Four thousand rows under one condenser is not a scandal — it is how the certification programme works — but it is exactly why a figure copied off a spec sheet and a figure read off your own combination are so often different numbers. A sheet that already carries a reference number is telling you something about how it was assembled. Keep that number after the job as well: the directory has a separate Verify Certificate page that takes a reference number, a certificate date and a certificate number, and it still covers certificates printed after 30 July 2009.

What none of this tells you is whether the equipment is the right size for your house. A properly certified combination can still be comprehensively wrong for your building, and that answer lives in a Manual J load calculation and a Manual S selection. I hold no licence and I inspect nothing. This is two documents, your bid and a public database, held next to each other — and every figure above came off that database on 19 August 2026, which makes it a method with a date on it rather than a permanent fact.