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.
Jamul combines real winter freeze risk with 100-plus degree summer days and some of the most severe SDG&E power shutoff exposure in East County, so cold-climate heat pump equipment paired with battery backup is close to the working standard here rather than an upsell. Permits route through the County of San Diego. Equestrian and rural large-lot properties along Lyons Valley Road sometimes need longer line-set runs and separate equipment for outbuildings.
East County commercial HVAC carries the highest summer cooling loads in the county, and equipment sized for that load costs more on a full rooftop replacement. Maintenance contracts here focus on predictable monthly cost specifically to avoid an emergency repair during a heat event.
| 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 Jamul and East County 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.
Jamul sits in a zone SDG&E shuts off proactively during high fire-risk conditions, sometimes for a day or more, and that risk peaks during the same hot, dry stretches when cooling matters most. Pairing a heat pump replacement with battery backup runs $8,000 to $18,000 depending on battery size, but for rural properties dependent on well pumps as well as comfort, it often addresses more than just the AC.
East County commercial HVAC carries the highest summer cooling loads in the county, and equipment sized for that load costs more on a full rooftop replacement. Maintenance contracts here focus on predictable monthly cost specifically to avoid an emergency repair during a heat event.
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.