3.5-ton split systems
Rated products: 38 · model numbers: 93 · certified cooling 39,000–43,999 Btu/h
Of the 7 split-system size classes on this site, the 3.5-ton class has the fewest rated products. The LG KUSXA422A keeps the largest share of its 47°F capacity at 5°F. The Rheem RD18AY48AJVC lists the top HSPF2.
What the class is made of
Compressor staging
- variable-speed
- 7
- single-stage
- 19
- two-stage
- 12
Refrigerant
- R-454B
- 22
- R-410A
- 13
- R-32
- 3
Most listed brands: Friedrich (4), Amana (3), American Standard (3), DuraSTAR (3), AC PRO (2), BlueRidge (2), Fujitsu (2), and Lennox (2).
Highest in the class, rating by rating
| Rating | Highest | Value | Next value down |
|---|---|---|---|
| Kept at 5°F | LG KUSXA422A | 100% | Rheem RD18AY48AJVC, 94% |
| Output at 5°F | 1HVAC ACIQ-42-HPD (joint, with 1 more) | 46,000 Btu/h | Rheem RD18AY48AJVC, 38,000 Btu/h |
| COP at 5°F | Johnson Controls THF2B42T21 | 2.42 | Friedrich FRP15AZ42AJ2N, 2.40 |
| HSPF2 | Rheem RD18AY48AJVC | 10 | LG KUSXA422A, 9.8 |
| SEER2 | LG KUSXA422A (joint, with 1 more) | 19 | Daikin DH7VSA4210A, 17.5 |
| EER2 | AC PRO BH714S42P-…A (joint, with 2 more) | 13.2 | AirEase 4SHP17LE142P-…A, 13 |
Most heat kept at 5°F
EPA cold-climate designation only.
| Product | Kept at 5°F | Output at 5°F | COP at 5°F | Model numbers |
|---|---|---|---|---|
| LG KUSXA422A | 100% | 46,000 Btu/h | 2.00 | 1 |
| Rheem RD18AY48AJVC | 94% | 38,000 Btu/h | 2.20 | 1 |
| 1HVAC ACIQ-42-HPD | 92% | 46,000 Btu/h | 1.90 | 7 |
| Hisense AUWR-48U3SP | 82% | 34,600 Btu/h | 1.94 | 2 |
| Daikin DZ6VSA421EA | 76% | 30,600 Btu/h | 2.20 | 2 |
| Daikin DH7VSA4210A | 76% | 31,000 Btu/h | 2.00 | 3 |
| Rheem RD16AY48AJVC | 60% | 25,800 Btu/h | 2.00 | 1 |
| Friedrich FRP15AZ42AJ2N | 57% | 23,000 Btu/h | 2.40 | 2 |
| Rheem RP15AZ42AJ2N | 57% | 22,800 Btu/h | 2.40 | 4 |
| Fujitsu WP15AY42AJ2N | 52% | 21,000 Btu/h | 2.20 | 1 |
Next to the other split-system sizes
Share of 47°F capacity kept at 5°F: dot = class median, ring = 90th percentile.
Certified as of October 27, 2026.