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.
Potrero is remote southeast San Diego County near the Mexican border, and dispatch distance is a real factor in project planning here. Most rural large-lot and ranching properties run on propane heat, making propane-to-heat-pump conversion the standard upgrade. Permits route through the County of San Diego, and severe SDG&E power shutoff exposure makes battery backup a common pairing, particularly for ranching operations dependent on well pumps.
Mountain commercial HVAC in Julian, Alpine, and Ramona is lower volume but higher cost per job once drive time and, in some cases, propane-fed rooftop units are factored in. Full replacements here run the highest ceiling in the county range.
| 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 Potrero and Backcountry 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.
Because power shutoffs in this zone don't just affect comfort, they can knock out well pumps and other equipment ranching operations depend on. Pairing a heat pump replacement with battery backup adds $8,000 to $18,000 depending on battery capacity, and for a property where a multi-day outage means more than an uncomfortable house, that's often the deciding factor over a standard replacement.
Mountain commercial HVAC in Julian, Alpine, and Ramona is lower volume but higher cost per job once drive time and, in some cases, propane-fed rooftop units are factored in. Full replacements here run the highest ceiling in the county range.
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.