Restaurant HVAC in San Diego runs $25,000 to $80,000 for a typical retrofit and $60,000 to $180,000 for new construction. The cost spread is wide because restaurants aren’t one system. They’re three. You’ve got the dining-room RTU, the kitchen makeup air unit (MAU), and the Type I or Type II exhaust hood. Get the balance wrong and you cook the dining room, pull grease through the dining HVAC coil, or fail your final inspection.
Here’s the honest version of what restaurant owners in Gaslamp, Little Italy, OB, PB, North Park, and Hillcrest actually deal with.
The three systems and why they have to balance
A restaurant kitchen pulls a massive amount of air out through the hood. A 10-foot Type I hood over a standard cook line moves 2,500 to 4,000 CFM of exhaust. That air has to come from somewhere. If it doesn’t come from a sized makeup air unit, it comes from your dining room, which means your AC is fighting the hood for every cubic foot of conditioned air.
Type I hoods (CMC Section 508 and IMC 507) cover grease-producing equipment: ranges, fryers, charbroilers, woks, salamanders. These require fire-rated ductwork, fire suppression, and grease-listed exhaust fans.
Type II hoods cover heat and steam only: dishwashers, ovens that don’t produce grease, steam tables. Lower fire risk, lower cost, but still need code-compliant exhaust.
Makeup air units replace the air the hood pulls. California Mechanical Code requires makeup air for any hood exhausting more than the building’s natural infiltration can supply, which in practice means every commercial kitchen. The MAU should deliver 80 to 90 percent of the hood’s exhaust rate, with the remaining 10 to 20 percent coming from the dining HVAC. That deficit creates the slight negative pressure in the kitchen that keeps grease and smells out of the dining room.
Differential pressure target: kitchen should sit at -0.02 to -0.05 inches of water column relative to the dining room. Most San Diego restaurants we measure are running -0.10 or worse, which means the dining HVAC is constantly pulling kitchen air across the building. That’s why the host stand smells like fryer oil.
What a restaurant HVAC retrofit actually costs
Real San Diego numbers for 2026, based on what we see quoted across the county:
| Project type | Cost range | Typical timeline |
|---|---|---|
| Dining RTU replacement only (5-7.5 ton) | $12,000-$22,000 | 1-2 days |
| Type II hood + small MAU (dishroom) | $8,000-$18,000 | 2-3 days |
| Type I hood + listed MAU + fire suppression | $25,000-$55,000 | 5-10 days |
| Full retrofit (RTU + MAU + hood + ducting) | $45,000-$80,000 | 10-20 days |
| Ground-up new construction restaurant HVAC | $60,000-$180,000 | Per construction schedule |
Costs go up if your building is in the historic Gaslamp district or any San Diego Historical Resources Board territory, because rooftop equipment screening is required and structural reviews take longer. They also go up at coastal sites (OB, PB, Mission Beach, Imperial Beach) because salt-air corrosion means stainless or coated MAU casings, which add 15 to 25 percent.
What kitchen density does to your equipment
San Diego has neighborhood clusters where restaurant HVAC fails faster than anywhere else in the county. Gaslamp, Little Italy, and the Convention Center corridor pack restaurants wall-to-wall. Your hood exhaust gets pulled into your neighbor’s makeup air intake. Your RTU pulls in their kitchen exhaust. The grease accumulation on dining HVAC coils in those districts is 3 to 5 times what we measure at suburban restaurants in Mira Mesa or Carmel Mountain.
Practical impact on coil life: a standard dining RTU evaporator coil should last 12 to 15 years. In a Gaslamp restaurant with poor pressure balance, we see them fouled in 4 to 6 years. Replacement cost is $1,800 to $4,200 per coil. This is the silent cost of unbalanced restaurant ventilation that most owners don’t see until the bill comes.
Hood cleaning frequency (NFPA 96 and San Diego Fire-Rescue):
- Solid fuel cooking (wood-fired pizza, charcoal): monthly
- High-volume frying, charbroiling: quarterly
- Moderate-volume cooking: semi-annually
- Low-volume or seasonal: annually
Skip a cleaning cycle and your fire insurance carrier can void coverage after a grease fire. We’ve seen it.
Decision framework: when to retrofit vs replace
Repair only when:
- Hood and MAU are under 8 years old and properly sized
- Dining RTU is under 10 years old with documented maintenance
- Pressure balance is within target range
- No code violations flagged in your last health inspection
Full retrofit when:
- You’re changing menu to add grease-producing equipment (adding a fryer or charbroiler)
- Hood is undersized for current cooking load (most common issue we see)
- MAU is missing, undersized, or running open-loop without modulation
- You failed a fire marshal inspection on hood or ducting
- Building is changing occupancy class
New build when:
- Building shell doesn’t have rooftop structural capacity for current code-compliant equipment
- You’re a tenant in a former retail or office space being converted to F&B
- Your landlord is doing a tenant improvement allowance that covers HVAC scope
For tenant improvements in San Diego, plan 4 to 8 weeks for plan check at Development Services before any work starts. Restaurants in the City of San Diego require mechanical plans stamped by a California-licensed engineer for hood and MAU work above small Type II thresholds.
FAQs
How much does it cost to install a Type I hood and makeup air in San Diego?
Budget $25,000 to $55,000 for a 10 to 14 foot Type I hood with listed makeup air, fire suppression, ducting through the roof, and electrical. Smaller hoods or simpler Type II setups can run $8,000 to $18,000. Historic district sites or buildings without easy roof access add 20 to 40 percent.
Do I need a permit to replace a restaurant rooftop unit in San Diego?
Yes. Any RTU replacement on a commercial restaurant requires a mechanical permit through San Diego Development Services or your city’s building department. Like-for-like swaps go through the counter or online plan check. Sizing changes or new ductwork trigger full plan review with engineering stamps.
What’s the difference between Type I and Type II hoods?
Type I covers grease-producing equipment (ranges, fryers, charbroilers, woks) and requires fire-rated ducting, fire suppression, and grease-listed exhaust fans. Type II covers heat and steam only (dishwashers, non-grease ovens) and uses simpler construction. The California Mechanical Code spells out which equipment requires which type.
Why does my dining room smell like the kitchen?
Negative pressure imbalance. Your kitchen should sit slightly negative to the dining room so smells and grease stay in the kitchen. If the kitchen is too negative or the dining room is too negative, air flows the wrong way. The fix is usually rebalancing makeup air delivery, not bigger AC.
How often does a restaurant HVAC system need maintenance?
Quarterly minimum for any San Diego restaurant. Monthly for high-volume cooking. Coils foul faster in restaurant applications than any other commercial use due to grease aerosols and high run hours. A skipped maintenance year typically costs 2 to 4 times the maintenance contract in early equipment replacement.
Can I use a residential AC contractor for my small restaurant?
For a coffee shop or bakery with no Type I hood requirements, sometimes. For anything with a grease hood, no. Restaurant HVAC requires understanding of CMC Chapter 5, NFPA 96, and how makeup air, exhaust, and dining HVAC interact. Most residential contractors will undersize the makeup air or skip the pressure balance check entirely.
What rebates are available for restaurant HVAC in San Diego?
SDG&E offers commercial efficiency rebates for high-efficiency RTUs and demand controlled kitchen ventilation (DCKV) systems. DCKV can rebate $1,500 to $7,500 per hood depending on size. High-efficiency MAU rebates run $500 to $3,000 per unit. Check current programs at sdge.com before any retrofit.
When to call us
We handle restaurant HVAC retrofits, hood and makeup air upgrades, and dining RTU replacements across San Diego County. If your kitchen is too hot, your dining room smells like the kitchen, or you’ve got a tenant improvement project coming up, call (442) 777-6440 or check our commercial HVAC service page for the full scope. We also publish a general overview at commercial HVAC for small businesses if you want broader context first.