Best efficiency
Mini-splitENERGY STAR
MRCOOL DIY 4th Gen 12K
Cooling
12,000 BTU
Covers
500 ft²
Efficiency
22 SEER2
Noise
32 dB
$1099 est.
via partner retailers Mini-split ENERGY STAR
Pioneer Diamante WYS012
by Pioneer · Model WYS012-23
A DIY-friendly favorite with a Toshiba inverter compressor — quiet, efficient, and well-supported, with an optional install kit.
Cooling
12,000 BTU
Covers
500 ft²
Efficiency
20 SEER
Noise
34 dB
$949 est.
typical street price · via Amazon Is 12,000 BTU right for your room? Run the sizing calculator
Strengths & trade-offs
Pros
- Toshiba inverter compressor
- Quiet & efficient (20 SEER)
- Optional DIY kit
Cons
- Wi-Fi is an add-on
- Lineset/install not included
What the Pioneer Diamante WYS012 costs to run
Estimated from this unit's 20 SEER rating at 8 hours/day of cooling, using average residential electricity rates for each US climate zone. Your usage and utility rate will shift these numbers — run the calculator for your exact room.
| Climate zone | Example regions | Est. cost / month |
|---|---|---|
| Cool North | Pacific NW, Upper Midwest, New England | $26 /mo |
| Mixed / Temperate | Mid-Atlantic, Midwest, Mountain | $28 /mo |
| Hot & Humid | Southeast, Gulf Coast, Texas | $23 /mo |
| Hot & Dry | Southwest, Desert | $25 /mo |
Full specifications
| Type | Mini-split air conditioner |
| Cooling capacity | 12,000 BTU |
| Rated coverage | 500 ft² |
| Efficiency | 20 SEER |
| Noise (low) | 34 dB |
| Smart features | App |
| ENERGY STAR | Yes |
| Model number | WYS012-23 |
| Typical street price | $949 |
Specs from manufacturer data; price and ratings are snapshots and may vary. See how we evaluate.
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Senville LETO SENL-12CD
Cooling
12,000 BTU
Covers
550 ft²
Efficiency
21.2 SEER2
Noise
28 dB
$799 est.
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Mitsubishi MZ-GS12NA
Cooling
12,000 BTU
Covers
550 ft²
Efficiency
25.6 SEER2
Noise
19 dB
$1972 est.
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