Windmill
Windmill WhisperTech 12,000 BTU Window AC (12W2WI)
$549
Released 2024
Best Air Conditioners · head-to-head
Windmill WhisperTech 12,000 BTU Window AC (12W2WI) vs Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W)
A sourced, side-by-side comparison. Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W) is cheaper at $449. Every spec and price links to its source.
Hisense
Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W)
$449Cheaper
Released 2024
Which is better: the Windmill WhisperTech 12,000 BTU Window AC (12W2WI) or Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W)?
On the specs we track, they're closely matched. The Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W) is the cheaper at $449.
See Windmill WhisperTech 12,000 BTU Window AC (12W2WI) on Amazon See Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W) on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Windmill WhisperTech 12,000 BTU Window AC (12W2WI) | Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W) |
|---|---|---|
| US price | $549 | $449 Best Buy price (SKU 6636567) |
| Brand | Windmill | Hisense |
| Released | 2024 | 2024 |
| Type | window | window |
| Btu | 12000 BTU | 12000 BTU |
| Coverage (sq ft) | 550 | 450 |
| Noise dba | 42 | 37 |
| Smart Wi-Fi | Yes | Yes |
| Energy star | Yes | Yes |
| Inverter | Yes | Yes |
| Ceer | 13.5 | 15 |
Sources — Windmill WhisperTech 12,000 BTU Window AC (12W2WI): windmillair.com (verified 2026-06-15). Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W): bestbuy.com (verified 2026-06-15).
What's the difference between the Windmill WhisperTech 12,000 BTU Window AC (12W2WI) and Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W)?
Where the two actually differ on the specs we track (3 of 8). Matching specs are omitted.
- Coverage (sq ft): Windmill WhisperTech 12,000 BTU Window AC (12W2WI) 550 vs Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W) 450
- Noise dba: Windmill WhisperTech 12,000 BTU Window AC (12W2WI) 42 vs Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W) 37
- Ceer: Windmill WhisperTech 12,000 BTU Window AC (12W2WI) 13.5 vs Hisense UltraSlim 12,000 BTU Smart Inverter Window AC (AHLW1225TW1W) 15