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.
Fallbrook is unincorporated, so HVAC permits go through the County of San Diego rather than a city office, typically $300 to $550 with longer processing than an incorporated city. Avocado-grove estate ranches and gated communities like Saddle Creek and Fallbrook Country Club often pair heat pump replacement with battery backup given how exposed this area is to SDG&E power shutoffs. Inland heat here runs 95 to 105 degrees in summer, pushing real cooling load on every system.
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 Fallbrook 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.
Fallbrook sits in a high SDG&E wildfire-risk zone with real exposure to public safety power shutoffs, which can knock out AC for a day or more during the hottest stretch of summer. Pairing a heat pump with battery backup adds $8,000 to $18,000 depending on battery size, but for avocado-grove ranch properties with wells or livestock depending on power, it's often worth the investment beyond just comfort.
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.