T
#54
Trane 38 Series (4TXK3818A10NU)
Best for: Official 18,000 Btu/h official cooling, 22 official SEER2
4.5/10
What we like
- Official ENERGY STAR record lists 22 SEER2.
- Official ENERGY STAR record lists a cold-climate designation.
Watch out for
- Official ratings are for the certified outdoor and indoor combination shown; a different official indoor head can change the certified figures.
Score breakdown
| Official SEER2 | 22 |
|---|---|
| Official HSPF2 | 10 |
| Official EER2 | 13.5 |
| Official COP at 5°F | 1.8 |
| Official ENERGY STAR unique ID | 4,529,667 |
| Official outdoor unit model number | 4TXK3818A10NU** |
| Official indoor unit model number | 4MXW3818A10NU** |
| Official series name | 38 Series |
| Official product type | HP - Mini or Multi Split |
| Official cooling capacity | 18,000 Btu/h |
| Official heating capacity at 47°F | 18,000 Btu/h |
| Official heating capacity at 17°F | 15,100 Btu/h |
| Official heating capacity at 5°F | 20,000 Btu/h |
| Official cold-climate designation | Yes |
| Official ENERGY STAR Most Efficient 2025 | Yes |
| Official refrigerant type | R-410A |
| Official AHRI reference number | 9150125 |
| Official indoor unit brand | TRANE |
| Also certified under official brand or model listings | American Standard 4TXK3818A10NU / indoor 4MXW3818A10NU |
| Official ENERGY STAR date certified | 06/13/2026 |
| Price | Check price |