Best Mini-Split for ADU (2026): Studio + 1BR ADU Picks
ADUs (accessory dwelling units) typically need 18-24K BTU multi-zone or single-zone depending on layout. Pre-permit ADU plans should include the unit spec. It affects electrical sizing.
ADUs (granny flats, casitas, garage conversions) need their own HVAC. They can't share with the main house. Mini-splits dominate this market because they fit any layout, install with minimal duct work, and meet California Title 24 efficiency requirements.
Quick Comparison
| Pick | Best For | Approx Price |
|---|---|---|
| Best Studio ADU | Mr Cool DIY 5th Gen 12K BTU 22 SEER2 | $1,599-$1,899 |
| Best 1BR ADU Single-Zone | Mr Cool EasyPro 5th Gen 18K BTU 24 SEER2 | $2,199-$2,499 |
| Best 1BR/2BR Multi-Zone | Mr Cool Multi-Zone 27K BTU 2-Zone | $3,200-$3,800 |
Our Picks
ADU Sizing by Type
Studio ADU (under 500 sq ft): 12,000 BTU single zone is plenty.
Studio ADU with kitchen (500-700 sq ft): 18,000 BTU single zone.
1BR ADU (700-900 sq ft): 18,000-24,000 BTU single zone OR multi-zone with 1 living-area head + 1 bedroom head.
2BR ADU (900+ sq ft): multi-zone with 2-3 indoor heads.
Permit + Title 24 Requirements
Every California ADU requires HEERS (Home Energy Rating System) compliance. Mini-splits with 20+ SEER2 easily exceed Title 24 requirements. The Mr Cool EasyPro line at 24 SEER2 specifically markets as Title 24-compliant for ADU permits.
Submit the mini-split spec with the ADU plans. Surveyor and city inspector both verify HVAC at permit pull and final inspection.
Electrical Considerations
ADU electrical typically runs from the main house's panel. 240V dedicated circuit for the mini-split (15-30A depending on size). Most ADU builds also need a sub-panel for the ADU itself: handled during construction, not retrofit.
Where to Buy
For the unit, we recommend HVACzar. They verify Title 24 compliance specs at point of sale and offer contractor wholesale for HVAC pros.
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Get a Mini-Split Quote →Frequently Asked Questions
What size for a studio ADU?
Under 500 sq ft: 12,000 BTU. With kitchen: 18,000 BTU.
Multi-zone or single-zone for a 1BR ADU?
Single-zone if you want simplicity. Multi-zone if you want independent bedroom control. Both work for permits.
Title 24 compliant?
Yes, Mr Cool 22 SEER2+ models exceed California Title 24 requirements with margin.
Where do I buy?
HVACzar (hvaczar.com) for Mr Cool lineup with Title 24 compliance verification.
How much for ADU install?
$799-$1,299 single-zone. $1,499-$3,499 multi-zone. Permit-required HVAC final inspection included.
Our service areas: MrCool Installation in Los Angeles · MrCool Installation in San Diego · MrCool Installation in Irvine
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