Marc Viau MechanicalHVAC contractor in Cornwall, ON
Marc Viau Mechanical is an HVAC contractor at 209 Eleventh St W, Cornwall, ON K6J 3B4, ranked #15 of 24 HVAC contractors in Cornwall and rated 4.4 from 25 Google reviews. Open Monday to Friday.
Cornwall, ONUpdated 0 paid placements in any rankingHow we rank
Key facts
| Address | 209 Eleventh St W, Cornwall, ON K6J 3B4Get directions |
|---|---|
| Phone | (613) 932-8180 |
| Website | marcviaumechanical.ca |
| Hours | Monday to Friday: 8 AM – 4 PM |
| Google rating | 4.4 from 25 Google reviews |
Trades
Each trade shows the evidence we matched it on.
- HVACmain tradeGoogle main category
Service area
Based in Cornwall, ONView on map
Opening hours
| Day | Hours |
|---|---|
| Monday | 8 AM – 4 PM |
| Tuesday | 8 AM – 4 PM |
| Wednesday | 8 AM – 4 PM |
| Thursday | 8 AM – 4 PM |
| Friday | 8 AM – 4 PM |
| Saturday | Closed |
| Sunday | Closed |
- Open evenings — no
- Open Saturdays — no
- Open Sundays — no
Typical heating and cooling prices
| Job | Low | Typical | High |
|---|---|---|---|
| AC replacementPer system, installed (unit plus labor); typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | CA$5,460 | CA$8,400 | CA$11,350 |
| Furnace replacementPer system, installed; typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | CA$3,970 | CA$6,770 | CA$9,690 |
Market ranges for the trade, checked October 2026, not a quote from this business. Ask for a written estimate.
Compare nearby HVAC contractors
| Business | Rank | CR Score | Google rating | License verified | Saturday | Sunday | Distance away |
|---|---|---|---|---|---|---|---|
| Marc Viau Mechanical (this business) | — | 55 | 4.4 (25) | — | No | No | |
| Mike Paquette Mechanical | #13 | 55 | 5.0 (4) | — | — | — | 7.8 km |
| Boileau Mechanical Ltd | #14 | 55 | 5.0 (14) | — | No | No | 7.3 km |
| Cornelisse & Sons Heating & Cooling | #16 | 55 | 5.0 (3) | — | — | — | 2.4 km |
Reviews
ContractorsRanked reviews
No ContractorsRanked reviews yet
4.4from 25 Google reviews
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Questions about Marc Viau Mechanical
How is Marc Viau Mechanical ranked in Cornwall?
Marc Viau Mechanical is ranked #15 of 24 HVAC contractors in Cornwall by CR Score, with 55 out of 100 as of October 2026. The score weighs reputation, credentials, review volume, recency, availability, trade focus, proximity, claimed profile, partnered and ContractorsRanked reviews. No business can pay to change its rank.
What are Marc Viau Mechanical’s hours?
Marc Viau Mechanical is open Monday to Friday. Its listed hours are Monday to Friday, 8 AM – 4 PM. It is closed on Saturdays and closed on Sundays. Hours come from the business listing; holiday hours may differ.
What do Google reviews say about Marc Viau Mechanical?
Marc Viau Mechanical has a rating of 4.4 from 25 Google reviews. The CR Score adjusts the star rating for review count, so a high rating from a few reviews counts for less than the same rating from many.
How do I contact Marc Viau Mechanical?
Call Marc Viau Mechanical on (613) 932-8180. The business is at 209 Eleventh St W, Cornwall, ON K6J 3B4. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.
Own Marc Viau Mechanical? Claim this profile.
Claiming is free. Correct your hours, trades and service area. The CR Score is recalculated from corrected data; payment never changes it.