Commercial HVAC & Refrigeration
Reliable service for RTUs, splits, walk-ins/reach-ins, ice machines, and commercial water heaters. Clean workmanship, clear documentation, and DaVinci Portal included.
Fast, no-nonsense diagnostics on HVAC, refrigeration, walk-ins/reach-ins, ice machines, and commercial water heaters.
Quiet, efficient rooftop (RTU) and split systems sized for your load, hours, and air changes—not just square footage.
Keep product safe and doors open. We service and maintain reach-ins, walk-ins, display cases, and prep coolers.
Production issues or dirty ice hurt service and health scores. We handle diagnostics, descaling, sanitizing, and filtration.
Quarterly, bi-annual, or annual PM designed to prevent breakdowns, document readings, and control costs.
Tank or tankless, properly sized and vented. We service, replace, and document combustion/element health.
Air-cooled and water-cooled chillers, towers, pumps, and VFDs, serviced from logged operating data and planned for replacement before they fail.
Combustion tuning, safety testing, and hydronic loop troubleshooting for commercial heating and process hot water.
Exhaust fans, make-up air units, and kitchen-to-dining balance that holds up during service. Mechanical side only; we do not clean hoods or ducts.
Schedules, setpoints, sensors, and economizer logic reviewed against how your building is actually used.
Variable refrigerant flow, ductless, and commercial split systems for offices, medical, hospitality, and equipment rooms.
Every covered unit gets a QR label. Scan to see completed services, technician notes, photos, upcoming work, and to schedule the next visit — all in one place.
Licensed • Bonded • Insured • Permit/inspection ready • Respect for your business and guests.
Uptime first. We document readings and maintenance to reduce surprises and control costs.
Walk-ins, reach-ins, ice machines, and water heaters—handled with the same precision as HVAC.
Don't see your equipment listed? If it's commercial-grade, we've likely worked on it — ask us.
Kitchen HVAC, walk-in/reach-in refrigeration, and ice machine service scheduled around service hours.
Full cold-chain refrigeration and sales-floor HVAC, documented for compliance.
Medication cold storage and surgical suite climate control with same-day response.
Scheduled around the school calendar, PLA and prevailing-wage ready.
One contractor across your whole portfolio, per-property asset tracking.
Large-footprint RTU systems and temperature-sensitive storage.
UA Local 250, PLA and prevailing-wage ready, certified payroll.
Yes—most diagnostics are same-day and many repairs can be completed in the same visit, parts permitting.
All across Orange County. See the full list on our Service Areas page.
Yes—Quarterly, Bi-Annual, and Annual tiers with included labor and free diagnostics on repairs.
Our QR-coded equipment portal included with every plan—service history, photos, notes, upcoming work, and self-scheduling.
The service list above reads as eleven separate offerings. In practice they are one body of work organized around the mechanical systems a commercial building depends on, and most buildings touch several of them at once. A restaurant has rooftop units, a walk-in, reach-ins, an ice machine, a water heater, a kitchen exhaust fan, and a make-up air unit. A medical office has split systems or VRF, medication refrigeration, hot water, and a controls layer that decides when all of it runs. A school campus may have all of the above plus a boiler plant. Treating each as a separate vendor relationship is how facilities end up with four contractors, four sets of records, and nobody who understands how the systems interact.
The structure here is deliberate. Commercial repair is the diagnostic front door for every system type. RTU and split installs, VRF and ductless, and chillers and central plant cover the comfort cooling and heating equipment at the three scales a commercial building might use. Boilers and hydronic heating and commercial water heaters cover heat and hot water. Walk-in and reach-in refrigeration and ice machines cover the cold side. Kitchen ventilation and make-up air covers the airflow problems specific to cooking. Building controls ties the equipment to how the building is actually used. And maintenance plans are the program that keeps all of it documented and out of emergency mode.
Every one of these is commercial-only. Davinci Mechanical is the commercial and union (UA Local 250) division of Scottish Tom's Heating & Air, CA license #1083101, based in Orange County. The company does not take residential work, because the tooling, training, parts stock, and scheduling for commercial systems are different from the residential trade.
Facility managers usually do not know which system is at fault; they know what the building is doing wrong. The table below maps the complaint you are likely to hear to the service that handles it. When the symptom could come from more than one system, the diagnostic visit sorts it out, and the first service listed is where to start.
| What you are seeing | Likely system | Start with |
|---|---|---|
| Space too warm or too cold, unit runs but does not keep up | RTU, split, or VRF capacity, airflow, or refrigerant issue | Commercial repair for diagnosis; may lead to RTU replacement |
| Some rooms fine, others uncomfortable, same building | Zoning, controls, duct balance, or a single failed zone unit | Building controls or commercial repair |
| Walk-in not holding temperature, ice on evaporator, product loss risk | Walk-in refrigeration: defrost, charge, condenser, door seals | Refrigeration, treat as urgent |
| Reach-in or display case warm, compressor running constantly | Condenser coil, fan, refrigerant, or gasket failure | Refrigeration |
| Ice machine slow, low production, cloudy or off-tasting ice | Scale, sanitation, water filtration, or harvest cycle fault | Ice machines |
| No hot water, lukewarm, or recovery too slow for the business | Commercial water heater or recirculation | Commercial water heaters |
| Heating weak or absent across a large building, radiators or hydronic coils cold | Boiler, pumps, or hydronic loop | Boilers and hydronic heating |
| Whole building warm, central plant alarms, chilled water temperature high | Chiller, tower, pumps, or plant controls | Chillers and central plant |
| Kitchen smoky or hot, doors hard to open, dining room drafty or odorous | Exhaust fan or make-up air failure, building pressure imbalance | Kitchen exhaust and make-up air service |
| Equipment runs nights and weekends, bills high, setpoints drift | Schedules, setpoints, sensors, economizer logic | Building controls |
| Office or tenant space on ductless or VRF with one indoor unit down or communication errors | VRF or multi-split circuit or controller | VRF and split systems |
| Nothing is broken yet; you want fewer surprises and a record | All of the above | Maintenance plans |
A warm walk-in or medication refrigerator is a product-loss event in progress. Call it in as urgent and say what is stored. Comfort complaints can usually wait for a scheduled visit; cold storage usually cannot.
Every job starts the same way regardless of which service it ends up under: find out what is actually wrong. A large share of commercial service calls across the industry consist of replacing the component that tripped without asking why it tripped. A compressor that fails on high head pressure gets replaced; the dirty condenser coil or failed fan that caused the high pressure is left alone; the new compressor fails the same way in a year or two. Root-cause diagnostics means tracing the fault back to the condition that produced it and fixing that condition, even when it is less dramatic than the part that failed.
The diagnostic visit produces one of three outcomes. A repair, where the equipment is sound and a specific fault can be corrected with a reasonable expectation that it stays corrected. A replacement conversation, where age, condition, or refrigerant make further repair a poor use of money, leading to RTU replacement, a refrigeration system replacement, or a plant or VRF project. Or a maintenance finding: the equipment is fine, the fault was caused by neglect (coils, filters, belts, drains, sensors), and the right response is a program so the neglect stops.
What ties the three together is the record. Readings taken during any visit are logged to the asset in the DaVinci Portal, where a QR label on the equipment gives anyone with a phone the service history, readings, and photos. On a maintenance plan the same readings get taken every visit, which turns a data point into a trend, and a trend is what lets a technician say the suction pressure has been creeping for three quarters and the unit probably has a slow leak, rather than discovering the leak when the compressor seizes. The diagnostics guide goes deeper on method; the second opinion diagnostic applies the process to a job someone else has already attempted.
Different buildings lean on different parts of the service list. Knowing which systems are typical for your property type helps when you are scoping a maintenance program or deciding what to include in a bid. The pairings below are typical rather than universal; a specific building can have any combination.
| Building type | Systems usually present | Where the risk concentrates |
|---|---|---|
| Restaurants and commercial kitchens | RTUs, walk-in and reach-ins, ice machine, water heater, exhaust fan and make-up air | Refrigeration product loss; kitchen airflow and heat; hot water for sanitation |
| Grocery, convenience, and retail | Sales floor RTUs, display cases and walk-ins, rack or condensing unit refrigeration, controls | Cold chain documentation; case temperatures; sales floor comfort during peak hours |
| Medical, dental, and veterinary | Splits or VRF by suite, medication and vaccine refrigeration, water heater, controls | Temperature logs for stored medication; exam room comfort; after-hours scheduling |
| Schools and public buildings | Package RTUs or central plant, boilers, cafeteria refrigeration and ice, controls | Summer and break scheduling; prevailing wage and documentation; long equipment lifecycles |
| Office and multi-tenant property | RTUs or VRF, central plant on larger buildings, water heaters, BAS | Tenant comfort complaints; after-hours runtime; portfolio-wide replacement planning |
| Warehouses and light industrial | Large RTUs or evaporative units, make-up air, process cooling, cold storage in some | Dock and floor temperature; large-footprint airflow; temperature-sensitive inventory |
| Hotels and hospitality | PTACs or VRF, banquet kitchen refrigeration and ice, central hot water, ballroom air handling | Hot water at scale; kitchen refrigeration during events; guest comfort |
Each of these has its own page under industries with more specific guidance, and the institutional building types (hospitals, campuses, government, utilities, airports, data centers, labs, senior living) are covered in the sectors library with a page per region.
Day-to-day service work, maintenance programs, and most repair and replacement runs out of the Orange County home base. The service areas page lists the cities with dedicated pages, from Irvine, Anaheim, and Santa Ana down to Mission Viejo, Laguna Niguel, and Aliso Viejo, and up through Fullerton and Yorba Linda. For those cities, the full service list applies, including same-day diagnostics where scheduling allows and maintenance plans with the DaVinci Portal included.
Outside Orange County, the company works across Los Angeles County, the Inland Empire, San Diego County, and Ventura County for larger commercial, institutional, public, and multi-site work. There are no local offices or yards in those counties, which affects what makes sense to send there. A single reach-in repair in Oxnard is not a good fit. A multi-building replacement program for a school district in Riverside, a central plant project in San Diego, or a maintenance contract covering a retail portfolio across Los Angeles and Orange counties is. Larger projects beyond Southern California are bid project by project through the bid projects page.
A restaurant owner with a warm walk-in calls, a technician comes, the problem gets fixed, and an invoice follows. That is service work, and it is the bulk of what the eleven services above describe. Institutional and public work follows a different path. A school district, a county, a water agency, or a hospital system issues a solicitation, bidders respond under rules set by the agency and by state law, the award goes through a formal process, and the work is performed under a contract with prevailing wage, certified payroll, insurance and bonding requirements, and sometimes a project labor agreement. The mechanical work on the roof may look the same. Everything around it does not.
Davinci Mechanical is set up for both. As the union (UA Local 250) division of Scottish Tom's, the company is PLA and prevailing-wage ready with certified payroll, which is a prerequisite for most public work in California rather than a selling point. The bid projects page explains how the company approaches solicitations, the bid work library has a page for each agency type and region with the specifics of how those owners procure HVAC, and the sectors library covers the technical side of institutional building types: DSA-governed school projects, HCAI-regulated hospital work, federal and military facilities, courts and detention, utilities, and so on.
For private owners the distinction still matters. A property manager putting a portfolio maintenance contract out to several firms, or a grocery chain scoping a refrigeration retrofit across a dozen stores, is running a procurement even if the law does not require one, and the documentation habits public work demands make private bids easier to compare and enforce.
Regardless of which of the eleven services a visit falls under, a few things are constant. The technician diagnoses before recommending. Options are explained with the reasoning behind them before any work beyond the diagnostic is authorized. Readings are taken and recorded, not estimated. Photos document the condition found and the work done. And the record goes to the asset's page in the DaVinci Portal, where it is available to you, to your auditors or inspectors if you have them, and to the next technician who touches the equipment.
Most commercial equipment outlives the memory of whoever installed it and the tenure of whoever managed the building at the time. The service history is usually a stack of invoices in a filing cabinet, if it exists at all. A QR label that opens the unit's full history changes who can make a good decision about that equipment and how quickly. It is included with service, not sold as an add-on, because the documentation is the point. If you are not sure which service applies, start at the contact page; the FAQ covers scheduling and coverage questions, and the plans page lays out the quarterly, bi-annual, and annual tiers.