Last updated: April 23, 2026
Ductless mini-split installation in San Diego County runs $4,800 to $18,000, depending on how many zones the system needs. A single-zone system for one room or an ADU is the cheapest way to add cooling without ductwork. A four-zone whole-home system costs more but replaces a full central system on a house that was never ducted.
San Diego's cost swing depends on which decade your neighborhood was built. A North Park Craftsman with no existing ductwork usually means a ductless heat pump retrofit, since running full ducting through a 1920s bungalow's low attic space is impractical and expensive. Clairemont and Linda Vista's 1950s-60s tract homes usually keep central ductwork but need duct sealing or replacement to stop 25 to 40 percent air loss. Permits run through the City of San Diego and generally land between $250 and $500, with Downtown and Hillcrest condo projects adding HOA coordination steps.
Central San Diego mini splits go into additions, garage conversions, and ADUs where running ducts through a finished ceiling isn't practical, and per-zone pricing keeps small single-room jobs at the low end. Line-set runs kept discreet on older facades can add modest labor cost.
| Item | Typical cost | Notes |
|---|---|---|
| Single-zone system, installed | $4,800 - $7,500 | One indoor head, common for an ADU, garage conversion, or bonus room |
| Two-zone system, installed | $8,500 - $12,000 | Two indoor heads on one outdoor condenser |
| Three-zone system, installed | $11,000 - $15,000 | Common for a small home or a living area plus two bedrooms |
| Four-zone system, installed | $14,000 - $18,000 | Whole-home coverage on houses without existing ductwork |
| Salt-rated outdoor unit upgrade | $400 - $1,000 added | Corrosion-resistant coil and cabinet for homes near the water |
| Extra line-set run per zone | $300 - $700 | When an indoor head sits far from the outdoor condenser |
| ADU or garage-conversion package | $4,800 - $12,000 | Sized to the space, usually a single or two-zone system |
| Dedicated electrical circuit addition | $300 - $800 | Needed when the outdoor unit requires its own breaker and the panel has room |
Ranges reflect San Diego and Central San Diego. Your exact figure depends on the factors below. We quote flat-rate before starting.
Mini-splits can qualify for SDG&E and TECH Clean California rebates when the system replaces window units, wall units, or an aging central system with efficient heat-pump equipment. The exact rebate depends on the equipment and your home, so we confirm eligibility during the estimate rather than promising a figure ahead of time. Financing is available, and a single-zone system for an ADU or converted garage is often the lowest-cost way to add real cooling and heating to a space that never had ductwork.
Most pre-1950 San Diego homes without existing ductwork are better served by a ductless mini-split heat pump than a retrofit ducted system. A two to three zone system for a 1,200 to 1,800 square foot Craftsman typically runs $11,000 to $18,000, well below the $25,000-plus a full ducted retrofit can hit once you account for ceiling and soffit work.
Central San Diego mini splits go into additions, garage conversions, and ADUs where running ducts through a finished ceiling isn't practical, and per-zone pricing keeps small single-room jobs at the low end. Line-set runs kept discreet on older facades can add modest labor cost.
A single-zone system runs $4,800 to $7,500. Multi-zone systems scale up from there, with a four-zone whole-home setup running $14,000 to $18,000. The number of indoor heads is the biggest driver of the total cost.
Yes, it's usually the most practical option. A single-zone mini-split adds cooling and heating without running new ductwork, and it's sized specifically to a small, well-sealed space, which keeps both the equipment cost and the running cost down.
A single-zone system for one room is the lowest-cost option, typically $4,800 to $7,500 installed. Cost per zone drops slightly as you add more heads to the same outdoor condenser, but the entry cost is lowest with one zone.
Often, yes. SDG&E and TECH Clean California offer rebates on qualifying heat-pump mini-split systems, especially when replacing window units or an inefficient central system. We confirm your actual eligibility and dollar amount during the free estimate.
Flat-rate pricing, confirmed before any work starts. Same-day scheduling on most calls.