Tell us what is happening in your building. We show you the right service. Commercial air conditioning, ventilation and heating in Montréal, Laval, Longueuil, the South Shore and the North Shore
15 services sorted by need, a three-question diagnostic and a calculator that decodes your Hydro-Québec bill. The on-site estimate is free and the quote arrives within 24 h.
15 services. Type a word or tell us what is happening.
Each service opens a card: what it fixes, the signs to watch, the first step and the full page.
15 services
No service matches that word. Try “heat”, “air” or “bill”, or call 514 316-2973.
Three questions. A plan in the right order.
The diagnostic crosses your need, your building type and urgency, then ranks the services to open.
1. What brings you here?
2. Your building
3. When?
Your Hydro-Québec bill, decoded: energy, demand, winter effect.
Move the sliders to match your bill. You see right away which part weighs most, and which service tackles it.
Three numbers from your bill
Indicative, before taxes, Hydro-Québec rates in effect April 1, 2026. Assumes each winter month reaches the winter peak and the other months the rest-of-year peak.
Have my last 12 bills analyzedAll 15 services side by side, with the licence that covers them.
Filter by what concerns you. Each row leads to the full page.
| Service | What it fixes | When to think of it | RBQ | |
|---|---|---|---|---|
| Air conditioning | Hot zones, units that can no longer keep up, replacement projects. | Before summer, or as soon as a zone overheats | 15.10 | Open → |
| Heating | Cold workstations, high demand peaks, old electric heaters. | After a steep winter bill | 15.10 · 16 | Open → |
| Ventilation | Stale air, odours, unbalanced pressure, make-up air. | Stale air, odours, new tenant | 15.8 | Open → |
| Building automation | HVAC running at night, winter peak, thermostats out of control. | Empty space at night, winter peak | 16 · 15.8 | Open → |
| Refrigeration | Rising temperatures, frost, refrigerant leaks, leak tests. | Rising temperature, frost | 15.10 | Open → |
| Preventive maintenance | Filters, coils, drains, leak tests, maintenance calendar. | Over a year without a visit | 15.8 · 15.10 · 16 | Open → |
| Emergency | Heating, cooling or refrigeration down during business hours. | Right now | 15.8 · 15.10 · 16 | Open → |
| Design and installation | New builds, additions, change of use, plans to be sealed. | Before signing the plans | 15.8 · 15.10 · 16 | Open → |
| Indoor air quality | Headaches, dust, odours, staff complaints. | Complaints or headaches | 15.8 | Open → |
| Ducts and piping | Poorly served rooms, leaks, whistling, refrigerant piping. | Poorly served rooms, whistling | 15.8 · 15.10 | Open → |
| Upgrades and retrofit | Equipment at end of life, old refrigerants, rising bills. | Equipment at end of life | 15.8 · 15.10 · 16 | Open → |
| HVAC consulting | Conflicting quotes, audits before a lease or purchase, incentive files. | Before buying, leasing or signing | 15.8 · 15.10 · 16 | Open → |
| Dehumidification | Fog, mould, pools and rinks. | Fog, mould, pool | 15.8 · 15.10 | Open → |
| Humidification | Dry winter air, static, materials that crack. | November to March | 15.8 · 16 | Open → |
| Custom solutions | Unusual buildings, conflicting zones, leaving oil or gas. | An unusual building | 15.8 · 15.10 · 16 | Open → |
A business’s HVAC year, month by month.
The current month is selected. Bluish months are Hydro-Québec’s winter period.
Eight numbers the regulations impose on a business.
Tap a card for the detail and the source.
Our three licences cover most needs. The rest goes to a licensed partner.
A clear quote says who does each part. Ours does too.
Ducts, grilles, diffusers, air exchangers, make-up air, duct-mounted humidifiers.
Heat pumps, air conditioning, VRF, walk-in coolers, refrigerant piping.
Equipment power, controls, thermostats, sensor wiring (CMEQ).
- Natural gas, propane15.2
- Boilers, hot water, glycol15.4
- Plumbing, drain connection15.5
- Alarms, cameras, access controlBSP permit
- Sealed plans, where requiredEngineer
AirGreen holds RBQ licence 5645-9605-01, subclasses 15.8, 15.10 and 16. Anything outside those subclasses goes to a partner who holds the right licence, and we tell you before you sign.
Who can pay part of the work.
The programs that most often apply to commercial projects, with their detailed page.
Rates G and Flex G. At least 10% stays at your expense. ENERGY STAR certified split heat pumps.
Learn more →Hydro-Québec75%Efficient Solutions, medium and large businessesUp to 75% with the simplified option. Amount calculated by Hydro-Québec’s tool.
Learn more →Federal30 %Clean technology tax creditFor eligible corporations, on certain equipment including heat pumps. Your accountant confirms.
Learn more →ÉnergirDual energyElectricity – natural gas dual energyFor gas-heated businesses adding a heat pump.
Learn more →Six mistakes we often see in commercial buildings.
The winter peak sets 65% of billed demand until the next winter.
That work needs RBQ subclasses other than ventilation and refrigeration.
Some incentives require an application before work. Check first.
The regulation requires a leak test before any refrigerant charge (s. 9).
HVAC that was never reprogrammed heats and cools empty space.
An oversized unit short-cycles, dehumidifies poorly and wears out faster.
Short answers to the questions we hear most.
Which service should I pick if I don’t know where the problem comes from?+
Start with the three-question diagnostic above. It ranks the services in order. Otherwise, book the free estimate: the technician finds the cause on site.
How much does the estimate cost?+
Nothing. The on-site estimate is free, the quote arrives within 24 h and the final price is confirmed before work starts.
Where do you work?+
Montréal, Laval, Longueuil, the South Shore and the North Shore. Our showroom is in Boucherville.
Which licences do you hold?+
RBQ licence 5645-9605-01: 15.8 Ventilation, 15.10 Refrigeration and 16 Electrical. Gas, plumbing and hot-water heating go to a licensed partner.
Why does my summer bill stay high?+
On rates G and M, billed demand is never below 65% of the peak reached during the winter period (December 1 to March 31) of the last 12 months. A January peak is paid until the next winter.
Rate G or rate M: which applies to my business?+
Rate G covers accounts whose minimum billing demand is below 65 kW. Rate M applies when demand reaches 50 kW or more and the account no longer qualifies for G. Your bill shows the rate that applies.
What is rate Flex G?+
A rate G option for accounts under 50 kW: 10.173 ¢/kWh in winter outside events, but 56.516 ¢/kWh during peak events, between 6 and 10 a.m. or 4 and 8 p.m., December 1 to March 31, 120 h at most.
Is there an incentive for my commercial project?+
Often. Hydro-Québec’s Efficient Solutions helps small businesses (at least 10% stays at your expense) and medium and large businesses. The federal clean technology tax credit may also apply. Have the incentive confirmed before you sign.
What humidity level does the law require in a business?+
At least 20% relative humidity during business hours, in offices and commercial establishments built or operated after December 19, 1979 (RSST, s. 119).
Must my building report its energy use?+
In Montréal, By-law 21-042 covers buildings of 2,000 m² or more or 25 units or more: annual declaration by June 30. Québec also requires a declaration from large buildings starting in 2027 (5,000 m² and up).
What is the minimum temperature in my premises?+
It depends on the work: 12 to 20 °C under RSST Schedule IV. Office work requires 20 °C.
How often should equipment be serviced?+
We recommend a visit before each heating and cooling season. Refrigeration and air-conditioning units of 20 kW or more need a leak test at least once a year, never more than 15 months apart.
Do you handle emergencies?+
Yes. During business hours (Mon–Thu 8 a.m.–6 p.m., Fri 8 a.m.–4 p.m.), breakdown calls get priority. Call 514 316-2973 or 514 316-3007 (South Shore).
Do you work on gas rooftop units?+
Yes for the ventilation, refrigeration and electrical parts. The gas side (burner, valve, connection) goes to a partner holding subclass 15.2.
No question matches. Call us at 514 316-2973, we will answer.
One building, one visit, a clear plan.
Tell us what is happening. A technician comes, measures and sends a quote within 24 h. The final price is confirmed before work starts.
Sources checked on November 2, 2026.
- Hydro-Québec, Electricity rates in effect April 1, 2026 (rates G, Flex G and M).
- Regulation respecting occupational health and safety (CQLR, c. S-2.1, r. 13), ss. 116 to 119 and Schedule IV.
- Halocarbons Regulation (CQLR, c. Q-2, r. 29), ss. 9 and 21.1, current to June 1, 2026.
- MAPAQ, food storage temperatures (5M approach).
- City of Montréal, By-law 21-042 (page updated September 8, 2026); Government of Québec, large building performance reporting (Gazette officielle, June 23, 2026).
- Hydro-Québec, Efficient Solutions, March 2026 guides; Canada Revenue Agency, clean technology investment tax credit (ITA, s. 127.45); Énergir, dual energy, April 1, 2026 guide.
- Régie du bâtiment du Québec, licence 5645-9605-01.
Amounts shown are indicative estimates, before taxes. Only Hydro-Québec, Énergir and the responsible bodies confirm a rate or an approved incentive.