Since January 1, 2025: new R-410A systems from pre-2025 components only
The same outdoor unit can be a 15.2 or a 19.5.
SEER2 belongs to the pair, not the box. Match the wrong indoor unit and your customer loses the rebate they were promised — and you find out at the inspection. Type a model number and see every certified match, the real numbers for each one, and what replaces it now that R-410A is on its way out of new systems.
- EER2
- 14
- HSPF2
- 8.6
Try it on the unit in front of you
Type the model number from the nameplate — outdoor or indoor unit. Partial numbers work. No sign-up.
No nameplate handy? Try ML17XP1 or 27VPA9.
- 56,454
- certified pairs
- 12,687
- outdoor units
- 35,756
- R-410A → A2L paths
- 283
- brands
What you get
Three things you can't look up fast anywhere else
Every indoor unit that matches
A single outdoor unit can carry over a hundred certified indoor matches. You get the list, sorted by efficiency, with the AHRI reference number for each pair to put on the rebate paperwork.
- One line per indoor unit — not one per certification
- Search by the outdoor or the indoor model number
- Browse by brand when you have no model in hand
- FT5BD3617X*19.5
- CAA**3721AM*19
- FT5BD2417X*19
- CVAVA3617XMA*19
Showing 4 of 60, highest SEER2 first
The number for that exact pair
Not the brochure number — the certified SEER2, EER2, HSPF2, capacity at 47°F, 17°F and 5°F, and COP at 5°F for the combination you are actually installing.
- ENERGY STAR Cold Climate and Most Efficient flags, per pair
- The best pairing first, and how much the worst one costs you
- Certification date and the AHRI reference on every pair
- SEER2
- 19.5
- EER2
- 14
- HSPF2
- 8.6
- Cooling BTU/h
- 23,800
- Heat @ 47°F
- 22,400
- Heat @ 17°F
- 20,400
- Heat @ 5°F
- 21,200
- COP @ 5°F
- 1.9
AHRI ref 218695489 — the number that goes on the rebate paperwork
What replaces the R-410A
Look up the unit you are pulling out and get ranked A2L replacements: same brand first, capacity within 15%, and a plain note on what you gain or lose on cold-climate certification.
- 4,481 R-410A outdoor units mapped to A2L candidates
- Never a 2-ton suggested in place of a 3-ton
- Works both ways: see which R-410A units an A2L model can replace
same brand · gains cold-climate certification · SEER2 up to 20.5 (was 16.8)
1 of 8 ranked A2L candidates for this unit
Photographs are illustrative. Photo credits.
Cold-climate check
What does it put out on your coldest day?
Every pair carries its certified heating capacity at 47°F, 17°F and 5°F. Pick your city once and the lookup reads those numbers against your winter design temperature — the cold day you design for, not the record low.
| City | Winter design temp |
|---|---|
| Fargo, North Dakota | -14.5°F |
| Minneapolis, Minnesota | -6.2°F |
| Denver, Colorado | 5.1°F |
| New York City, New York | 17.8°F |
| Atlanta, Georgia | 26.4°F |
| Houston, Texas | 33.8°F |
| Miami, Florida | 51.9°F |
169 cities across all 50 states, D.C. and Puerto Rico. See the full table. That is equipment capacity — what the house needs that day is a Manual J load calculation.
Coldest listed city in each state, 99% winter design dry-bulb, °F. Source: U.S. Department of Veterans Affairs, HVAC Design Manual, Table 7-1.
Drawn for the trade
Diagrams you can actually read
16 technical drawings made for this site — no stock art, no manufacturer brochure. They carry the course and the field guide, in light and dark, readable on a phone.
The whole trade in one loop: where the heat goes in, where it comes out, and the line between the high side and the low side.
Included with access
A course that starts from zero
One idea per lesson, a checkpoint after each, technical diagrams drawn for this course. And the lessons open real certified equipment in the lookup, so you learn on the data you will work with.
Understanding and certification prep. It does not teach hands-on brazing, evacuation, charging or live electrical work — those need supervised training, and A2L refrigerants are mildly flammable. It does not issue any EPA credential; you sit the 608 with an EPA-approved certifying program.
Heat Mover
From zero. Name every part of a split, mini-split or heat pump, and read any nameplate.
Equipment Reader
Why SEER2 belongs to the pair. R-410A, R-32, R-454B and the A2L transition, read — not touched.
608 Candidate
Core, Type I, II, III. The law, the numbers and the traps, with a checkpoint after every lesson.
Free field guide
Reference you can cite
The rules and numbers a residential tech gets asked about, each one with the federal source next to it. Open to everyone — no sign-up.
Pay once. It stays yours.
No subscription, no seat count, no renewal. The diagnostic platforms on your phone bill $39–$99 per tech per month. This is one payment for permanent access, and the data is refreshed every week from the federal ENERGY STAR certification database.
- Unlimited lookups, on any device
- AHRI reference number on every pair
- A2L replacement paths for R-410A equipment
- Winter design temperature for 169 U.S. cities, tied to what each pair actually puts out that day
- The course, 55 lessons, included
- Members-only forum: field notes from other technicians, by model
- 15-day refund, requested from your own dashboard
Questions before you buy
Is this a subscription?
No. One payment of $39.00 and the access does not expire. There is no renewal and nothing to cancel. If it is not for you, there is a 15-day refund you request from your own dashboard.
Where does the data come from?
The equipment data is the U.S. EPA ENERGY STAR certified air-source heat pump list, a public federal dataset. We re-import it every week. The AHRI reference number for each pair is part of that dataset. Design temperatures come from the U.S. Department of Veterans Affairs HVAC Design Manual. Sources are listed on the credits page.
Is my equipment in it?
It covers ENERGY STAR certified air-source heat pumps — split systems, mini and multi splits and single-package units — 12,687 outdoor units from 283 brands. Straight air conditioners and furnaces are not in it. The search at the top of this page is the real database: check your model before you pay.
Does it tell me how to install or charge a system?
No. It reports certification data and federal rules; the installation decision is yours and the manufacturer's instructions govern. Always confirm the refrigerant on the nameplate — R-32 and R-454B are not interchangeable.
Does it work on my phone?
Yes. It is a website built for a phone in one hand: nothing to install, and it works on any device with a browser.
How do I sign in after I pay?
There is no password. You sign in with the email you used at checkout.