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.
Bonsall permits route through the County of San Diego, since it's unincorporated, generally $300 to $550. Avocado-grove ranch properties along Lilac Road and Old River Road often have longer line-set runs from house to equipment pad than a standard suburban lot, adding modest labor cost. Vista Valley Country Club homes tend toward premium multi-zone equipment, and severe SDG&E power shutoff exposure here makes battery-backup pairing common.
Inland commercial HVAC in Escondido, San Marcos, and Vista handles heavier summer cooling loads on rooftop packaged units than coastal commercial space, which pushes full-replacement pricing slightly above the county baseline.
| 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 Bonsall and North County Inland 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.
Mostly logistics. Larger rural parcels often mean longer refrigerant line-set runs between the house and the condenser pad, and sometimes separate equipment for a guesthouse or casita on the same property. Neither is a huge cost driver on its own, but together they can add a few thousand dollars over a standard suburban install of the same tonnage.
Inland commercial HVAC in Escondido, San Marcos, and Vista handles heavier summer cooling loads on rooftop packaged units than coastal commercial space, which pushes full-replacement pricing slightly above the county baseline.
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.