Serving the GTA and nearby Ontario info@kelvinmechanical.ca +1 905-407-7353

Commercial / Mechanical

Commercial HVAC and Mechanical Service for Small and Mid-Size Ontario Buildings

Rooftop units, packaged units, make-up air, restaurant and kitchen ventilation, unit heaters and gas piping for light commercial buildings, scoped in writing after a site walk.

Daikin VRV outdoor unit on a rooftop stand with the Toronto skyline behind

In pictures

What this work looks like

Rooftop unit serviceKelvin job photo
Rooftop unit servicePanels open for a planned visit
Rooftop equipment by craneKelvin job photo
Rooftop equipment by cranePlanned lift day
Sheet-metal weather hood on a rooftop standKelvin job photo
Sheet-metal weather hood on a rooftop standRooftop ventilation equipment

Photos from Kelvin Mechanical jobs in the GTA and nearby Ontario.

Who the commercial side is built for

Kelvin Mechanical handles light commercial and mechanical work for small and mid-size buildings: offices, shops, restaurants, garages, plazas and multi-unit properties. The equipment is usually on a roof, on a pad beside the building or in a mechanical room, and the work has to fit around tenants, customers and opening hours.

Serving Ontario homeowners, landlords, property managers and light commercial clients, we keep commercial scheduling, access planning and written scopes separate from residential visits. We serve the GTA and nearby Ontario. The service areas page lists the approved cities.

Property managers and landlords

Tenant calls, planned seasonal visits, equipment lists and written notes for owners, handled through one organized work-order process.

Restaurants and food service

Dining room comfort, make-up air balance and exhaust fan support, planned around service hours and prep schedules.

Garages and workshops

Unit heaters, ventilation and make-up air for bays and shops where large doors, dust and fumes change the heating and air picture.

Small businesses

Rooftop and packaged units, thermostats and schedules for owners who lease a single unit or run a stand-alone building.

Retail and plazas

Customer-facing comfort with equipment on shared roofs, where access, noise and landlord approvals have to be sorted early.

Offices and professional suites

Zoned comfort, fresh air and steady temperatures for staff and visitors, with filters and belts kept on a schedule.

Multi-unit buildings

Common-area ventilation, mechanical room equipment and suite-level units, with work orders and equipment lists kept per building. See property management HVAC.

From site walk to written scope

Every commercial job starts with the building, not a price list. A visit has four parts, and each one is written down so a manager, landlord or owner can review the scope before anything is ordered.

1. Site walk

We look at where the equipment sits, how it is reached, what the space is used for and where the problems show up. Roof hatches, ladders, mechanical rooms and tenant access are noted.

2. Equipment nameplate review

Model, serial number, voltage and phase, gas input, refrigerant type and age are recorded from each nameplate. That shows what can be repaired, what can be replaced like for like and what needs a closer look.

3. Access and shutdown planning

We agree on who opens the building, when power or gas can be isolated and whether work should happen outside opening hours. Crane or lift needs are identified at this stage.

4. Written scope

You receive a written scope listing the work, the equipment, any trades involved and what is excluded. Pricing varies with equipment, venting, ductwork, installation complexity and warranty options; a quote follows a site review.

A diagnostic fee may apply to repair calls; it is confirmed at booking. Start with Build My Quote or call +1 905-407-7353.

What to send with a commercial request

A few details up front let us plan the visit, ask the right questions and bring suitable parts.

  • Photos of each equipment nameplate, plus the thermostat or controller display
  • How the roof or mechanical room is reached: hatch, fixed ladder, ground pad or lift needed
  • A building contact, and the landlord or property manager if approvals are required
  • Operating hours, blackout dates and any tenants who need notice
  • What stopped or changed, when it started and any error codes shown
  • Previous service notes or invoices, if you have them
  • For gas work, a photo of the meter and the existing piping route

Planned visits and maintenance agreements

A maintenance agreement is a written schedule: which units, how often, what is checked and what is reported. Filters, belts, coils, drain pans, burners, economizers and controls are looked at on a seasonal or quarterly rhythm that suits each piece of equipment.

Each visit ends with a service note so owners and property managers can plan repairs and replacements instead of reacting to breakdowns. Details are on the commercial maintenance page. Terms and pricing are quoted after a site review.

Installation, repair and maintenance on every system

Each commercial service page covers the same three needs, so you can start from the equipment you have rather than the type of call.

Installation

Site measurements, curb or pad work, gas and power connections, duct transitions and start-up readings are planned before the unit arrives.

Repair

Faults are traced to a part or a setting first. You get written options, including whether repair or replacement makes more sense.

Maintenance

Seasonal checks, clean coils, fresh filters, belt and motor checks and written notes keep small problems from turning into shutdowns.

If equipment fails: the emergency pathway

Commercial emergency service is subject to availability, and we do not promise a response time. Call +1 905-407-7353 with the address, the unit type and what has stopped, and we will tell you plainly what we can offer.

A diagnostic fee may apply and is confirmed at booking. The full pathway, including what to have ready, is on the commercial emergency service page.

If you smell gas, see smoke or hear a carbon monoxide alarm, leave the building and call 911 or the gas utility first.

Where our commercial scope stops

We keep the commercial side honest. Kelvin Mechanical works with licensed and qualified professionals and trade partners, depending on the project scope, and we say so when a job belongs to another trade.

  • Large industrial or plant equipment, chillers, cooling towers and central boiler plants
  • Commercial refrigeration such as walk-in coolers and freezers
  • Fire-suppression systems and hood-and-duct cleaning, which belong to specialist trades
  • Roof structure, membrane and flashing repairs, which belong to a roofing contractor
  • Gas utility meters and regulators, which belong to the gas utility
  • Building automation programming beyond thermostat and unit controller setup

If your building is outside this range, we will say so at the first call rather than take on the wrong job.

Customer reviews

What customers say

Kelvin Mechanical recently serviced the air conditioning system at the IODE charitable thrift shop in Oakville, where my mother volunteers. We are so pleased with their exceptional service and competitive pricing. We highly recommend their services..

Scott M. Google review

As a Sana Grill restaurant in Stoney Creek we had a great experienc with Zia last month.his not just a gret profisional contractor his kind gentelmn out his own soul In his work.alwys give him a calll when we need se. Thing relted to het pump or AC. Shkar

Allan K. Google review

Five-star Google reviews, copied as written with shortened names. Read more reviews

Help centre

Common questions

Do you work on large industrial plants or high-rise buildings?

No. The commercial side is built for small and mid-size buildings with light commercial equipment. If your project is bigger than that, we will tell you early and, where we can, point you toward the right kind of contractor.

Can you quote on equipment another contractor installed?

Yes, in most cases. Send nameplate photos and a short description with your request. We confirm what we can service or replace after reviewing the unit and the site.

Can one agreement cover several locations?

It can. Each building is walked, its equipment is listed and visits are scheduled per site. Terms are confirmed in writing, and pricing follows a site review.

Is emergency commercial service available?

Emergency service is subject to availability. Call +1 905-407-7353, and we will confirm what is possible at the time. No response time is promised.

Which areas do you cover for commercial work?

We serve the GTA and nearby Ontario, including Toronto, Etobicoke, Mississauga, Brampton, Vaughan, Markham, Oakville, Burlington and Hamilton, and the other cities on our service areas page. Call +1 905-407-7353 to confirm your address.

What counts as light commercial HVAC in Ontario?

Light commercial usually means small and mid-size buildings served by rooftop units, packaged units, make-up air units, unit heaters and exhaust fans. It sits between a house furnace and large plant equipment. Kelvin Mechanical works on the light end of that range. If you are not sure where your building falls, send nameplate photos through Build My Quote and we will say so at the first call.

Who pays for HVAC repairs in a leased commercial space in Ontario?

It depends on the lease. In many leases the tenant looks after equipment that serves only their unit, while the landlord handles the roof and shared equipment, but the wording varies. Read the repair and maintenance clauses, and ask your property manager before ordering work, especially anything on the roof. Send us the lease wording and a nameplate photo if it helps us plan the visit.

Do commercial HVAC changes need a permit in Ontario?

Often they do, depending on the work and the municipality. New or altered gas piping, new equipment on a roof, ductwork changes and electrical work can each trigger a permit or a notification. A like-for-like swap may be treated differently from a new installation. Rules differ by municipality and change, so we confirm the requirements in the written scope before work starts.

How do I choose a commercial HVAC contractor in the GTA?

Ask for a site review before a quote, a written scope that lists the equipment and the exclusions, and a clear answer on who carries out the gas and electrical work. Ask how access, tenant notice and after-hours work will be handled. Our guide to choosing an HVAC contractor in Ontario lists more questions, whether your building is in Toronto, Mississauga, Brampton or Hamilton.

How do I know when commercial HVAC equipment should be replaced?

Repeat repairs, an aging unit, a cracked heat exchanger, parts that are hard to find and growing comfort complaints are common signs. Refrigerant type matters too, because older units may use refrigerants that are being phased out. A written equipment list with ages and conditions makes the decision easier. See commercial maintenance for how that list is built.

Can commercial HVAC work be done without closing my business?

Sometimes. Many visits, such as filter changes or fan checks, fit around normal hours. Replacements, and any gas or power isolation, may need a closed period or a staged plan. Work outside opening hours is subject to availability and is agreed in writing beforehand. Tell us your hours and blackout dates when you call +1 905-407-7353.

How is commercial HVAC service different from residential service?

Commercial equipment usually sits on a roof or a pad and often runs on three-phase power with larger gas inputs. Access, tenant notice, landlord approval and opening hours shape the schedule. Each building and each unit is scoped in writing. Kelvin Mechanical keeps commercial scheduling separate from home visits for that reason. The first step is a site walk and a written scope.

What happens if my building has no HVAC records?

That is common. The first visit builds the record from scratch: location, nameplate details, approximate age, condition and filter or belt sizes for each unit, with photos where they help. The list then becomes the base for maintenance, repair decisions and replacement planning. Send whatever you do have, even old invoices, through Build My Quote.

Quote and booking

Request a commercial quote

Share a few details and we will follow up. A written quote comes after a site review. There is no online checkout.

  • City and service type help us route your request
  • Urgency and property details let us prepare properly
  • Optional equipment photos speed up repairs and replacements

Prefer to talk? +1 905-407-7353

Gas smell or carbon monoxide alarm? Leave the building and call 911 first. Do not use this form.