Last updated: April 23, 2026
Commercial HVAC service in San Diego County ranges from a $149 service call to a $25,000 rooftop unit replacement on a larger building. Most repair calls land well under $2,500. A full RTU replacement is the big-ticket item, priced by tonnage, and maintenance contracts are priced by square footage rather than a flat rate.
National City costs split hard between residential and the Mile of Cars commercial corridor. Bungalows around Roosevelt Avenue and the Brick Row historic area usually run mini-split retrofits since there's no attic space for ducting. Rooftop package unit work for the dealerships along National City Boulevard is priced by tonnage and access, with after-hours install common since showrooms can't go dark during business hours. Residential permits route through the City of National City, generally $250 to $450.
Central San Diego commercial work spans Mission Valley offices, Kearny Mesa light industrial, and college-area retail, and rooftop package unit replacement pricing sits at the county's top-line range since it covers everything from a service call to a full multi-unit swap.
| Item | Typical cost | Notes |
|---|---|---|
| Commercial service visit | From $149 | Diagnostic and minor repair on rooftop or packaged units |
| Rooftop unit (RTU) repair | $400 - $2,500 | Most common repair range, covers motors, boards, and refrigerant work |
| RTU replacement, 3 to 5 ton | $8,000 - $18,000 | Typical for a small retail space or office suite |
| RTU replacement, 7.5 to 10 ton | $15,000 - $25,000 | Typical for a larger retail, restaurant, or warehouse space |
| Preventive maintenance contract | Priced by square footage | Quoted per building, not a flat per-unit rate |
| After-hours or weekend service call | Standard rate | Scheduled around your business hours, no separate overtime surcharge |
Ranges reflect National City and Central San Diego. Your exact figure depends on the factors below. We quote flat-rate before starting.
A preventive maintenance contract catches most rooftop unit failures before they turn into an emergency call during business hours, and it's priced by square footage so a small suite doesn't pay the same rate as a large warehouse. SDG&E offers commercial rebate programs for high-efficiency RTU replacements, and those figures depend on tonnage and efficiency tier, so we confirm the real number for your building rather than quoting one up front.
Rooftop package units on showroom and service-bay buildings run larger tonnage than residential systems and often need lift access for rooftop placement. After-hours or weekend scheduling, standard for dealerships that can't shut down during business hours, adds a labor premium but avoids lost sales time, which most owners consider worth it.
Central San Diego commercial work spans Mission Valley offices, Kearny Mesa light industrial, and college-area retail, and rooftop package unit replacement pricing sits at the county's top-line range since it covers everything from a service call to a full multi-unit swap.
A service call starts at $149. Most repairs run $400 to $2,500. A full rooftop unit replacement runs $8,000 to $25,000 depending on tonnage, with larger buildings needing multiple units.
Yes, for most property owners and businesses. A maintenance contract is priced by square footage and catches problems during a scheduled visit instead of an emergency call that disrupts business hours.
A standard service visit at $149 covers diagnostics and minor adjustments. Most straightforward repairs, like a failed contactor or a refrigerant top-off, stay under $1,000.
A full rooftop unit replacement is the largest expense, running $8,000 to $25,000 depending on tonnage. Buildings with multiple RTUs sometimes replace them in phases to spread out the cost.
Flat-rate pricing, confirmed before any work starts. Same-day scheduling on most calls.