HVAC & Heating
Cozy World Inc.
Toronto, ON
Keystone Mechanical Group
HVAC contractor in Toronto, Ontario
Keystone Mechanical Group is a HVAC contractor in Toronto, Ontario. The business is located at 2700 Dufferin St #28, York, ON M6B 3R4. It holds a Google rating of 4.2 out of 5 from 5 customer reviews. Listed services include heating contractor, furnace repair service and air conditioning contractor. Keystone Mechanical Group lists hours on 6 days of the week.
What customers say
MSARCH analyzed 5 of Keystone Mechanical Group's most recent Google reviews (of 5 total). 80% are positive (4-5★), averaging 4.2★.
What reviewers praise most
Keystone Mechanical were professional, informed, skilled, and reliable.
They fixed my boiler with professional professionalism, Care and great work.
Their technician was extremely knowledgeable and friendly.
A minority noted: “Never ever again, just very unprofessional, not punctual, dishonest, and deserves negative stars if possible.”
Themes and sentiment summarized automatically by MSARCH from public Google reviews, not paid placements. Updated August 2026.
Frequently asked questions
What are Keystone Mechanical Group's hours?
Keystone Mechanical Group lists these hours: Monday 8a.m.-4:30p.m.; Tuesday 8a.m.-4:30p.m.; Wednesday 8a.m.-4:30p.m.; Thursday 8a.m.-4:30p.m.; Friday 8a.m.-4:30p.m.; Saturday 9:30a.m.-3p.m.; Sunday Closed.
What is Keystone Mechanical Group's rating?
Keystone Mechanical Group has a Google rating of 4.2 out of 5, based on 5 reviews.
Where is Keystone Mechanical Group located?
Keystone Mechanical Group is located at 2700 Dufferin St #28, York, ON M6B 3R4.
What is Keystone Mechanical Group's phone number?
You can reach Keystone Mechanical Group at +1 416-782-3500.
Is Keystone Mechanical Group a good HVAC contractor?
Keystone Mechanical Group is rated 4.2/5 across 5 Google reviews. Always confirm licensing, insurance and a written quote before hiring any HVAC contractor.
More contractors in Toronto
Get a free quote from a Toronto HVAC contractor
Compare Keystone Mechanical Group with other top-rated HVAC contractors in Toronto, or request a free quote and we'll connect you with the right local pro at no cost.
Get a free quote