Frequently Asked Questions

Outages at operating businesses are triaged ahead of routine work, and same-day diagnostics are the norm for restaurants, markets, medical suites and occupied commercial buildings across Orange County. Maintenance plan members are placed at the front of the schedule during heat events and the fall Santa Ana season when every contractor is saturated. When calling, have the equipment type, the symptom and roof or equipment-room access details ready; that information lets the dispatcher send the right technician with the right parts the first time.

No. Davinci Mechanical is the commercial and union division of Scottish Tom's Heating & Air and handles commercial, institutional and public work only: rooftop units, split systems, VRF, walk-in and reach-in refrigeration, ice machines, commercial water heaters, chillers, boilers, kitchen ventilation and building controls. Mixed-use buildings are taken on where the equipment serving the commercial space is the scope. Residential inquiries are referred to the residential side of the company.

The site address and the on-site contact, the equipment involved and where it is located, what the equipment is doing or not doing, how long it has been that way, and whether anyone has worked on it recently. For refrigeration, the current box or case temperature and the set point help. For rooftop equipment, roof access arrangements matter more than most people expect; a locked hatch or a missing ladder is the most common reason a first visit runs long. Plan members can skip most of this because the asset record in the DaVinci Portal already holds it.

Yes, when an on-call technician is available, which covers most nights and weekends. After-hours work is billed at a different rate than normal-hours work, and that rate is confirmed before anyone is dispatched so there is no surprise on the invoice. For refrigeration failures the right first step is often a phone consultation: closing doors, turning off interior lights and moving product can protect inventory while a technician is en route, and sometimes the fix can wait until normal hours without loss.

Where scheduling allows, yes, and for maintenance plan sites continuity is the goal because a technician who knows the equipment notices changes that a stranger would miss. When a different technician does attend, the Portal record closes the gap: the full history, readings, photos and notes for every asset are available on a phone by scanning the QR label, so the new technician starts from the same information rather than from zero.

Service runs across all of Orange County, with frequent work in Irvine, Anaheim, Santa Ana, Orange, Tustin, Costa Mesa, Newport Beach, Huntington Beach, Garden Grove, Fullerton and the south county cities around Lake Forest, Mission Viejo and Laguna Niguel. City-specific detail, including the commercial districts and the climate exposure that affects equipment there, is on the service areas pages. Larger commercial, institutional and bid work extends into neighboring counties; see the question on regional coverage below.

It means finding out why a part failed before replacing it. A tripped compressor overload, for example, can be caused by a dirty condenser, a weak capacitor, low voltage, a restricted metering device or a failing compressor, and swapping the part that is visibly bad without checking the rest leads to the same call a few weeks later. The technician measures pressures, temperatures, amps and voltages, compares them with what the equipment should produce, and works back to the cause. The method is described in the diagnostics guide.

By looking at the unit's age, the repair history, the cost of the current repair relative to the remaining useful life, refrigerant type, energy performance and the operational risk of another failure at that location. A twelve-year-old rooftop unit on an older refrigerant with a failed compressor is a different conversation from a four-year-old unit with a failed contactor. The recommendation is written out with both options so the owner decides with the facts, and when the answer is replacement the RTU replacement process covers permits, cranes and Title 24.

Yes. A second-opinion diagnostic is an independent assessment of a unit that another company has said needs a major repair or replacement. The technician tests the equipment, documents the readings and photos, and gives a written opinion on whether the recommended work is necessary, whether a smaller repair would resolve it, or whether the original call was right. There is no obligation to have the work done by Davinci Mechanical afterward.

The technician diagnoses, then presents the findings and options before any parts are installed. Small items that can be done on the spot are approved verbally or in the Portal and documented. Larger repairs are written up with photos and readings, and the owner or facility manager approves in writing. Nothing beyond the diagnostic is started without approval, and if a repair uncovers a second problem, the technician stops and re-approves rather than continuing on assumption.

Trucks stock the components that fail most often on commercial equipment: capacitors, contactors, relays, fan motors in common sizes, belts, igniters, flame sensors, gaskets and refrigerant. Many repairs finish on the first visit. Compressors, specialty boards, variable-speed drives and manufacturer-specific parts are usually ordered from Southern California distributors with a confirmed ETA, and the follow-up visit is scheduled when the part arrives. Plan sites benefit here because known equipment means the right parts can be staged before the visit.

Usually, and these are often the most satisfying calls. A unit with a trail of repeat repairs almost always has an underlying cause that was never addressed: an airflow problem fouling the evaporator, a leak that keeps getting recharged, a control sequence that short-cycles the compressor. The first visit is a full diagnostic rather than another parts swap, and the findings go into a Portal record so the unit's history is finally in one place.

Ice on the evaporator coil means moisture is getting into the box faster than the defrost cycle can clear it, or the defrost is not working. The usual causes, in order of frequency, are a door gasket or sweep that no longer seals, a door being propped open during deliveries, a failed defrost heater or timer, a drain line that has frozen, or an evaporator fan not running. A technician checks all of them rather than just melting the ice, because ice that returns within a week was never fixed. The walk-in guide covers each cause.

Manufacturers generally call for a full clean and sanitize at least twice a year, and kitchens with high mineral content water, heavy use, airborne flour or yeast, or warm equipment areas often need it quarterly. Health inspectors in California look for the cleaning log and visible condition of the evaporator and bin. On a maintenance plan the sanitizing cycle is performed on schedule and logged on the asset record so the date is always available; see the ice machine guide for the process and the warning signs between visits.

Yes. Reach-in coolers and freezers, open and glass-door display cases, prep tables, under-counter units and remote-condenser case lineups are all covered under commercial refrigeration. Self-contained units are serviced in place, and rack or remote systems are handled at both the case and the condensing equipment. Grocery and convenience-store lineups are typically put on quarterly maintenance because case temperature drift shows up as product loss before it shows up as an alarm.

Treat it as urgent. A slow rise usually means the system is losing capacity rather than having failed outright, which gives a window to act before product is lost. Keep the door closed, check that the evaporator fans are running and the condenser is not blocked or covered, and call. Common causes are a condenser coil choked with dust or grease, a slow refrigerant leak, a failing compressor valve or a defrost that is not terminating. Moving product to another box is a reasonable precaution if the reading is near the safe limit.

Yes, within the technician's role. Federal rules and California's refrigerant management program impose leak repair, record-keeping and in some cases registration and reporting requirements on commercial refrigeration above certain charge sizes. Service records with leak checks, repair dates and refrigerant added are kept on the Portal asset record in a format that supports those requirements. Which thresholds apply to a given system depends on charge size and refrigerant type, so confirm current requirements; the refrigerant compliance guide explains the framework.

More than lifting a box onto a roof. A proper replacement includes verifying the existing curb and either adapting or replacing it, confirming structural capacity, pulling the mechanical permit, coordinating a crane and street or parking-lot closure if needed, matching electrical and gas supply, correcting any ductwork or economizer issues, meeting Title 24 requirements including acceptance testing where triggered, and commissioning the unit with documented readings. The RTU replacement page and the Title 24 and permits guide walk through each stage and the lead times involved.

Yes. Mechanical permits are pulled under California contractor license 1083101, and the replacement is designed to meet the current Title 24 energy code, which for commercial HVAC can involve economizers, fault detection, thermostat requirements and third-party or self-certified acceptance testing depending on the equipment size and the jurisdiction. Requirements are revised on a code cycle, so the specific obligations are confirmed against the version in force at permit time rather than assumed.

Yes. VRF and commercial split systems suit tenant improvements, additions to older buildings without duct capacity, server rooms, medical suites with zone-by-zone needs and historic structures where ductwork is impractical. The design work matters as much as the installation: line set lengths, refrigerant charge calculations, branch selector placement and controls integration determine whether the system performs as the manufacturer's literature promises. Installs are commissioned with recorded performance data and the asset records are set up in the Portal from day one.

For a straightforward like-for-like rooftop replacement, several weeks is typical once the proposal is approved, driven by equipment availability, permit processing and crane scheduling. Custom curbs, larger tonnage, utility upgrades or units with long manufacturer lead times extend that. The practical advice is to plan replacements in the winter and early spring so that equipment is installed and commissioned before the first summer heat event, when crane companies, distributors and permit counters are all busiest.

Yes. Commercial water heaters, tank and tankless, and boilers and hydronic heating are replaced with attention to venting category, combustion air, gas sizing, recirculation design and the hot water demand profile of the operation. Restaurants and hotels in particular are often under-served by a like-for-like swap when their usage has changed since the original installation. Options including condensing equipment and redundant configurations are presented with the trade-offs explained in the water heaters and boilers guide.

Match the frequency to the equipment, its operating hours and the cost of a failure. Kitchens, grocery and any site with refrigeration generally run quarterly; standard-hours retail, offices and schools fit bi-annual with visits before summer and before heating season; low-occupancy warehouse or storage with few units suits annual. Mixed sites split assets across tiers under one agreement. The plans page includes a decision table by property type and a description of what each visit covers, and the onboarding walkthrough confirms the recommendation against the actual equipment.

Supply and return air temperatures, refrigerant pressures with superheat and subcooling, compressor and motor amp draws, capacitor microfarad values, voltage, box and case temperatures on refrigeration, and water temperatures and combustion readings on heating equipment. Each number is stored on the asset record rather than in a PDF so that the next visit can be compared with the last. The comparison is where failures are caught early: a capacitor losing value or a compressor drawing more current than it did last quarter is scheduled for correction before it becomes an outage.

Plans include scheduled preventive visits, a waived diagnostic fee on repair calls, a block of labor hours per year and member-rate labor beyond those hours. Parts are always billed separately and quoted before installation. Emergency and after-hours response is available to members with priority scheduling, billed at the after-hours member rate. A plan is not a full-coverage contract that bundles major repairs into a fixed fee; the distinction is explained on the plans page so the two models can be compared honestly.

Yes, and it is the typical starting point. The onboarding walkthrough inventories every asset regardless of who installed it, labels each with a QR code, and records nameplate data and condition. The first maintenance visit establishes baseline readings, and recommendations from that visit tend to be longer than usual because deferred items surface all at once. Manufacturer warranties generally stay valid as long as maintenance is performed and documented to the manufacturer's requirements, which the Portal record is built to show.

The pre-summer visit, roughly April through early June, is the most important for cooling equipment and is where condensers are cleaned and refrigerant circuits proven before the first heat event. Inland sites get a second heavy-cooling visit during the September and October Santa Ana wind season, when dust loads condensers and heating sections need their first checks. Coastal sites receive corrosion inspection and fin rinsing on every visit. Winter is reserved for work that needs equipment offline. The Orange County climate guide explains the pattern.

Yes. Portfolio programs put every site under one scope with a per-site equipment schedule, so each asset runs at the frequency it needs while the client deals with one contact and one reporting format. The Portal gives the manager a view across all locations, sortable by age, repair history and open recommendations, which is the starting point for capital planning. Tenant access coordination and the split between landlord-owned and tenant-owned equipment are written into the scope; see property management.

A record-keeping system built around the equipment rather than the invoice. Every asset gets a QR label linked to a record that holds nameplate data, location, service history, every reading from every visit, technician notes, before-and-after photos, open recommendations and the next scheduled visit. Scanning the label with a phone opens the record; no app is required. It is included with service rather than sold as an add-on, and the DaVinci Portal page shows what a record looks like and how facility teams use it.

Yes. Service history, readings and photos for a single asset or a whole site can be exported as a report. Health inspectors ask for ice machine sanitizing dates and refrigeration temperature records; insurers ask for maintenance evidence after a loss; landlords and tenants ask for equipment condition at lease commencement and surrender. The same record serves each purpose without re-creating paperwork, and because the data is tied to the asset, a new facility manager inherits the full history on day one.

Access is granted per site to the people the owner or manager designates: facility staff, property managers, regional directors or an auditor for a defined period. A portfolio manager sees all of their sites; a store manager sees only their own. Records are not shared with other customers or with third parties without the account holder's direction. Technicians see the records for the sites they are dispatched to, which is what lets a new technician pick up where the last one left off.

The maintenance and repair documentation is separate from certified payroll, but both are kept to a standard that public agencies expect. Work on public projects includes certified payroll reporting under California prevailing wage rules, and the Portal provides the parallel technical record: what was done on which asset, by whom, with readings and photos. Agencies reviewing a maintenance contract's performance or closing out a project find the two records together answer most questions; the public agency procurement guide covers what agencies typically ask for.

Labels are replaced on the next visit and the record is unaffected, because the record lives in the system and the label is only the shortcut to it. Assets can also be found by location, nameplate or unit tag without scanning. Rooftop labels are placed inside the control panel door or on a protected cabinet face rather than on exposed sheet metal, and refrigeration labels go on the condensing unit or box exterior away from wash-down areas, which keeps replacement rare.

Yes. Davinci Mechanical is the commercial and union division of Scottish Tom's Heating & Air, signatory to UA Local 250. Technicians are trained through the union apprenticeship and journeyman programs, and union status is what allows the company to work under project labor agreements and on public projects where a signatory contractor is required or preferred. For private commercial customers this translates to consistent training standards and documented qualifications for the people on the roof.

Yes. Public works projects in California generally require prevailing wage rates set by the Department of Industrial Relations, contractor registration with the DIR, and certified payroll records submitted electronically. Those processes are in place, and the company is ready for project labor agreements. Requirements, thresholds and reporting portals change, so specifics are confirmed for each project. The prevailing wage guide explains how the system works and what an agency or general contractor should expect from a mechanical subcontractor.

California contractor license number 1083101, held under Scottish Tom's Heating & Air, covering the heating, ventilation, air conditioning and refrigeration work the company performs. License status, bonding and workers' compensation coverage can be verified on the Contractors State License Board website, and that verification is recommended for any contractor, not just this one. The guide to choosing a commercial HVAC contractor lists what else to check before signing.

Technicians hold the EPA Section 608 certification required to handle refrigerants, recover rather than vent refrigerant during repairs and replacements, and log refrigerant added or removed on the asset record. California's refrigerant management program adds registration, leak inspection and reporting duties for larger commercial refrigeration systems, and the transition away from high-global-warming-potential refrigerants is changing which refrigerants can be installed in new equipment. Current requirements should be confirmed for each system; the general framework is in the refrigerant compliance guide.

Yes. K-12 districts, community colleges, cities, counties, special districts and other public owners are a core part of the commercial scope, both for maintenance and for repair and replacement projects. Public work brings prevailing wage, procurement rules, site access and background requirements, and often a preference for scheduling during breaks. Those are handled as part of the normal process. Sector pages for schools and public works describe typical scopes, and bid projects covers how larger agency projects are pursued.

Yes, for larger commercial, institutional and public work. Los Angeles County, the Inland Empire, San Diego County and Ventura County are served from the Orange County base for projects and multi-site programs where the scope justifies the travel; there are no local offices in those counties. Single small repair calls far from Orange County are generally referred locally. Regional detail is on the pages for Los Angeles County, the Inland Empire, San Diego County and Ventura County.

Routine maintenance and non-urgent repairs are typically scheduled a few days to a few weeks out, depending on season. Spring and early fall fill quickly because every commercial operator is preparing for the same heat. Plan members have visits set on a calendar for the year and receive priority for repair calls, so their scheduling pressure is lower. For project work such as replacements, equipment lead times and permit processing drive the timeline more than technician availability does.

Yes. Restaurant equipment is commonly serviced in the morning before service or between lunch and dinner, retail rooftops are handled during business hours because the work is on the roof, and schools are scheduled during breaks or after dismissal. Refrigeration work that requires shutting a box down is coordinated so product can be protected. Early morning starts are routine; true overnight work is treated as after-hours and quoted accordingly.

Yes. Seal Beach, Huntington Beach, Newport Beach, Laguna Beach, Dana Point and San Clemente put rooftop and exterior equipment in salt air year-round, and the maintenance task list for those sites includes fin inspection, freshwater rinsing of condenser coils, close inspection of electrical terminations and fastener condition. At replacement, coated coils and corrosion-resistant hardware are recommended. City pages such as Huntington Beach and Newport Beach describe the exposure and what it does to equipment over time.

Yes. Plan members can request service or book the next maintenance visit from an asset record, attach a photo of the problem and note access instructions. Requests are confirmed with a scheduled window. Phone remains the right channel for outages, because a conversation at the start of a refrigeration or cooling failure often prevents product loss or narrows the diagnosis before the technician arrives. The phone number is (714) 594-9194.

Yes. Davinci Mechanical bids mechanical scopes for general contractors, owners and public agencies: rooftop unit and split system replacements across a building or portfolio, central plant work, refrigeration packages for grocery and food service, and maintenance contracts put out to bid. Proposals include the equipment schedule, scope boundaries, exclusions, schedule and the documentation approach. The bid projects page describes the types of work pursued and how to send plans and specifications for pricing.

Larger projects are considered nationwide on a project-by-project basis, typically for repeat clients, multi-site owners and public or institutional work where the scope supports mobilization. Licensing requirements differ by state and are addressed for each specific project rather than assumed. The nationwide bidding guide explains how out-of-area mechanical bidding works from the owner's side, including licensing, local labor and what to require of any contractor traveling to a job.

Drawings or at minimum an equipment schedule with nameplate data, roof plan and curb details, electrical and gas information, any structural reports, the required Title 24 and permit path, access and schedule constraints, prevailing wage status if public, and clear direction on who handles controls, roofing patches and electrical. Incomplete packages produce bids with different assumptions that cannot be compared. The project delivery and bidding guide lists what a complete package includes and the questions a bidder should be asking.

Yes. As a UA Local 250 signatory the company is PLA-ready, which many public agencies, school districts and large private owners in Southern California now require on major projects. Working under a PLA involves local hire goals, dispatch procedures, apprenticeship ratios and reporting, all of which are part of the normal project setup. Owners and general contractors assembling a team for a PLA project can send the agreement with the bid documents so that the requirements are priced correctly from the start.

Yes. Multi-year maintenance contracts for school districts, cities, counties and other agencies are a natural fit for the plan model, since the scope is defined by an equipment inventory and a task list per asset, and the documentation produced by the Portal is exactly what an agency contract administrator needs for performance review. Responses address the agency's specifications, prevailing wage and insurance requirements, and the transition plan for taking over equipment without a documented history. See public works and bid work for the sectors covered.