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.
Lakeside permits route through the County of San Diego since the community is unincorporated. Central Lakeside's older housing along Maine Avenue and Woodside Avenue needs straightforward heat pump replacement, while Eucalyptus Hills and Lakeside Country Estates' equestrian properties on larger lots sometimes need longer line-set runs and separate equipment for guesthouses. The eastern edge toward Alpine carries real SDG&E power shutoff risk, making battery backup a common add-on there.
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 Lakeside 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.
Sometimes, mostly from scale rather than the horses. Larger lots in Eucalyptus Hills and Lakeside Country Estates often mean longer refrigerant line runs from the house to the condenser pad, and occasionally a second system for a guesthouse or barn office. Neither is dramatic on its own, but together they typically add a few thousand dollars over a standard suburban lot install.
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.