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Check a heat pump’s certified ratings

Type the outdoor unit’s model number from its nameplate, or the AHRI reference number from your quote. You will see its ratings, how it compares with others of its size, and the rebate standards it meets.

Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated

Partial model numbers work. AHRI numbers find the pairing listed for each model.

Ductless, 2.5–3 tons: every model, highest efficiency on a 5°f day first

One size class at a time, so the numbers compare directly.

Showing Ductless, 2.5–3 tons (27,000–38,999 Btu/h cooling). What size is my system?

  1. 301ZMSB-36HV-USR2-Owith ductless indoor unit ZMSB-36HV-USR2-IZERO3 tons · 36,000 Btu/h · DuctlessGreat2.02
  2. 302ACIQ-27Z-HH-M4C1HVAC2.5 tons · 27,000 Btu/h · DuctlessGood2.00
  3. 303ACIQ-36Z-HH-M5C1HVAC3 tons · 36,000 Btu/h · DuctlessGood2.00
  4. 304ES-27Z-M4C1HVAC2.5 tons · 27,000 Btu/h · DuctlessGood2.00
  5. 305ES-36Z-M5C1HVAC3 tons · 36,000 Btu/h · DuctlessGood2.00
  6. 306EZ-36Z-M4B1HVAC3 tons · 34,000 Btu/h · DuctlessGood2.00
  7. 307AC-30Z-E-M4ACIQ2.5 tons · 30,000 Btu/h · DuctlessGood2.00
  8. 308AC-36Z-E-M4ACIQ3 tons · 36,000 Btu/h · DuctlessGood2.00
  9. 309AC-42Z-E-M5ACIQ3 tons · 37,000 Btu/h · DuctlessGood2.00
  10. 310ACIQ-27Z-HH-M4CACIQ2.5 tons · 27,000 Btu/h · DuctlessGood2.00
  11. 311ACIQ-36Z-HH-M5CACIQ3 tons · 36,000 Btu/h · DuctlessGood2.00
  12. 312ES-27Z-M4CACIQ2.5 tons · 27,000 Btu/h · DuctlessGood2.00
  13. 313ES-36Z-M5CACIQ3 tons · 36,000 Btu/h · DuctlessGood2.00
  14. 314A4MO23-27N2-M1HAI AIR CONDITIONING2.5 tons · 28,000 Btu/h · DuctedGood2.00
  15. 315A5MO21-36N2-M1AI AIR CONDITIONING3 tons · 35,000 Btu/h · DuctlessGood2.00
  16. 316A5MO23-36N2-M1HAI AIR CONDITIONING3 tons · 36,000 Btu/h · DuctedGood2.00
  17. 317AO25-33N2-M1Hwith ducted air handler AAH-36N2-CM1AI AIR CONDITIONING3 tons · 33,000 Btu/h · DuctedGood2.00
  18. 318UE-H24M1PAIR C2.5 tons · 27,000 Btu/h · DuctlessGood2.00
  19. 319UE-H36M1PAIR C3 tons · 36,000 Btu/h · DuctlessGood2.00
  20. 320ATMO36AXR32AIR TECH3 tons · 36,000 Btu/h · DuctlessGood2.00
  21. 321AC-30Z-E-M4AireForce2.5 tons · 30,000 Btu/h · DuctlessGood2.00
  22. 322AC-36Z-E-M4AireForce3 tons · 36,000 Btu/h · DuctlessGood2.00
  23. 323AC-42Z-E-M5AireForce3 tons · 37,000 Btu/h · DuctlessGood2.00
  24. 324AOODU-1D3SAOKOL2.5 tons · 27,000 Btu/h · DuctlessGood2.00
  25. 325AOODU-1D4SAOKOL3 tons · 35,000 Btu/h · DuctlessGood2.00

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

What size is my system?

Tons and Btu

A heat pump’s size is its rated cooling output, in Btu per hour. Installers talk in tons: one ton is 12,000 Btu per hour, so a 3-ton unit is about 36,000.

Where to find yours: the nameplate sticker on the outdoor unit lists the model number. Many model numbers include the size in thousands of Btu, such as 24 (2 tons), 36 (3 tons) or 48 (4 tons). Your quote or AHRI certificate also lists it. Look up a model number

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

Size classes used here

  • Up to 1.5 tonsunder 21,000 Btu/h
  • 2 tons21,000–26,999 Btu/h
  • 2.5–3 tons27,000–38,999 Btu/h
  • 3.5–4.5 tons39,000–56,999 Btu/h
  • 5 tons and up57,000 Btu/h and up

The advanced view lists every model with filters for brand, standard, size and type, sortable by any rating.

Open the advanced view