Walk-in cooler down on a Friday. Make-up air not feeding the line. Dining-room rooftop unit blowing 84-degree air to a packed house. We service the equipment that decides whether tonight's revenue happens.
A Birmingham full-service restaurant runs on four pieces of equipment that have to work simultaneously. The dining-room RTU keeps the front-of-house at a comfortable serving temperature — usually a 3-to-10-ton packaged rooftop unit per dining zone. The make-up air unit sits on the roof above the kitchen, pulling outside air, conditioning it, and pushing it into the kitchen to replace what the exhaust hood pulls out. The commercial exhaust hood — usually a Type I hood over the cooking line — pulls heat, grease, and combustion byproducts out under the requirements of the International Mechanical Code and NFPA 96. The walk-in cooler and walk-in freezer hold inventory at 35 to 38 degrees and 0 to minus-10 degrees respectively, and a failure on either creates an immediate food-safety and inventory-loss event.
These four systems are interdependent. A make-up air unit that fails leaves the exhaust hood pulling negative pressure on the dining room, which makes the front door difficult to open and pulls conditioned air out of the building. A dining-room RTU short-cycling on Friday at 7 PM means table turns slow and customers leave. A walk-in cooler losing two degrees per hour means an inventory write-off conversation with the GM by morning. We service all four as a system, not as four unrelated calls.
The technicians dispatched to commercial restaurant calls in Birmingham carry EPA Section 608 Universal certification, Alabama state HVAC licenses, and the truck inventory required for commercial work — high-pressure recovery equipment for R-410A and R-454B systems, combustion analyzers for gas-fired make-up air units, and refrigeration-class diagnostic gauges for walk-in cooler and freezer service. We are licensed, bonded, and insured for commercial work in Alabama.
A walk-in cooler that drifts from 38 degrees to 45 degrees over four hours is a food-safety problem under FDA Food Code 2022 cold-holding requirements. A walk-in freezer that loses temperature for six hours costs an inventory write-off on protein, ice cream, and frozen prepared items. For most Birmingham restaurants, the walk-in is the single highest-value emergency call.
The failure modes are predictable. Evaporator coil iced over from a defective defrost timer or stuck defrost heater is the most common — the coil turns into a block of ice, airflow stops, and the box warms up. Condenser fan motor failure on the outdoor condensing unit is the second — the unit can't reject heat, head pressure climbs, and the compressor either trips on high pressure or short-cycles itself to death. Refrigerant leak from a copper line set or a Schrader valve is the third — the system loses charge, runs hot, and capacity drops below what the box needs to hold temperature. Each of these has a different diagnostic and a different fix.
Our walk-in cooler protocol on a Birmingham emergency call: get the box on a portable cooling assist if the inventory is at risk, diagnose the failure mode against actual readings — refrigerant pressures, condenser fan amps, evaporator superheat — and either repair on the truck or scope a same-day return with the part. We do not guess at walk-in cooler problems. Read our walk-in cooler troubleshooting checklist for the diagnostic logic we follow, or review the failure-prevention guide if you operate multiple walk-in boxes.
Commercial kitchen exhaust hoods under the International Mechanical Code are sized to pull a specified cubic-feet-per-minute volume across the cooking line. NFPA 96 sets the fire-protection and cleaning requirements. The make-up air unit is sized to replace approximately that same volume with conditioned outside air pushed into the kitchen. When the two are balanced, the building runs at neutral or slightly positive pressure. When the make-up air unit fails or runs at reduced capacity, the exhaust hood pulls the difference out of the dining room — and the building runs negative.
You will know the make-up air unit is down before you see the readout. The kitchen feels hot. The cooks complain. The front door pulls hard. The dining-room thermostat reads correctly but the room feels wrong. The dining-room RTU runs continuously because conditioned air is being pulled out of the space and exhausted through the hood. Energy bills climb. Customer satisfaction drops.
Our make-up air diagnostic on a Birmingham restaurant call: verify the unit is calling for operation, verify the supply blower is running at design speed, verify the gas-fired heating section (if equipped) is firing under combustion analysis, verify the cooling section is operating at design refrigerant pressures, and confirm the supply air volume against the design CFM. A make-up air unit that is short-cycling, undercharged, or running with a failed blower motor needs that specific repair — not a generic service ticket.
Most Birmingham restaurants run two to four packaged rooftop units — a 3-to-10-ton unit per dining zone, often a dedicated unit for the kitchen, and sometimes a smaller unit for the bar or private dining area. The brands we see most are Carrier, Trane, York, Lennox, and Daikin. Each has its own diagnostic procedure, control board, and parts availability profile.
A dining-room RTU on a Friday at 7 PM is not a small call. The dining room running 84 degrees during dinner service costs table turns and customer-experience reviews on Google and Yelp. The repair has to be diagnosed correctly and fixed quickly, or the same problem repeats next weekend. The common failure modes on Birmingham restaurant RTUs are compressor failure (often after years of running on a fouled condenser coil), capacitor failure on the condenser fan, control board failure on units past year 10, and refrigerant leak from a coil that has corroded in the Birmingham humidity. We diagnose against actual readings, not against guesswork.
If the dining-room RTU is beyond economic repair — past year 12, multiple compressor events, R-22 refrigerant on a legacy unit — we will tell you that directly. Replacement on a commercial restaurant RTU runs through curb adapter sizing, refrigerant transition planning under the EPA AIM Act, and lead time on commercial packaged equipment. Read our commercial RTU replace-versus-repair guide for the decision framework.
A restaurant preventive maintenance contract is not the same document as an office-building PM contract. The equipment list is different. The failure modes are different. The visit frequency is different — restaurants run their equipment harder, longer, and in dirtier conditions than most office buildings.
The PM scope we write for a Birmingham restaurant covers: walk-in cooler and walk-in freezer condenser cleaning, refrigerant pressure log, evaporator coil inspection and defrost cycle verification quarterly. Make-up air unit blower, filter, and combustion analysis quarterly. Commercial kitchen exhaust hood — coordinated with the hood-cleaning vendor under NFPA 96 — quarterly visual and operational verification. Dining-room and kitchen RTUs: condenser coil cleaning, refrigerant pressure log, evaporator inspection, electrical connection torque check, and control diagnostic on a quarterly schedule per ASHRAE Standard 180 for commercial packaged equipment.
The contract is itemized against your actual equipment list. We do not charge a generic PM rate. Review the maintenance-contract guide before signing with any vendor, or download our contract template PDF to use as a checklist.
Service tickets dispatched by a human coordinator. Documentation written for the facilities file, not for the marketing brochure. Commercial-only service across Birmingham, Hoover, Vestavia, Pelham, Trussville, Alabaster, McCalla, and the broader Jefferson County and Shelby County metro.
Commercial HVAC only. Submit the form and a dispatch coordinator follows up by email. For active outages, call (205) 206-6606.
We email confirmation within business hours. For active outages, call the line above.
