HVAC company · South Lyon, Oakland County
Cornerstone Mechanical LLC
★ 5.0 16 Google reviews
Opens before 7 AMOpen after 8 PMWeekend hoursComes to youClaimed on Google
Call (248) 880-7865WebsiteDirectionsSee the South Lyon list
Cornerstone Mechanical LLC is a HVAC company in South Lyon, Michigan. Its TownAnswer score is 64 out of 100 (grade C+), from 5.0 stars on 16 Google reviews. It ranks #5 of 11 hvac companies in South Lyon and #859 in Michigan. It is a service-area business: it comes to you, from a base in South Lyon.
The 100-point TownAnswer score
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Google star breakdown
Details
| Address | Service area, map pin in South Lyon |
| Phone | (248) 880-7865 |
| Website | cornerstonemechanicalmi.com |
| Google category | HVAC contractor |
| Extra categories | Service establishment |
| Photos on Google | 12 |
| Claimed on Google | Yes |
Hours
| Monday | 6 AM to 10 PM |
| Tuesday | 6 AM to 10 PM |
| Wednesday | 6 AM to 10 PM |
| Thursday | 6 AM to 10 PM |
| Friday | 6 AM to 10 PM |
| Saturday | 6 AM to 10 PM |
| Sunday | 6 AM to 10 PM |
Questions
Is Cornerstone Mechanical LLC a good HVAC company?
Cornerstone Mechanical LLC has a TownAnswer score of 64 out of 100, grade C+, from 5.0 stars on 16 Google reviews. That ranks #5 of 11 hvac companies in South Lyon.
Where is Cornerstone Mechanical LLC?
Cornerstone Mechanical LLC is a service-area business based in South Lyon, Oakland County. It does not list a street address on Google. It travels to customers.
What are Cornerstone Mechanical LLC's hours?
Monday 6 AM to 10 PM; Tuesday 6 AM to 10 PM; Wednesday 6 AM to 10 PM; Thursday 6 AM to 10 PM; Friday 6 AM to 10 PM; Saturday 6 AM to 10 PM; Sunday 6 AM to 10 PM. Hours come from the Google listing. Confirm before you go.
How do I contact Cornerstone Mechanical LLC?
Call (248) 880-7865 or visit cornerstonemechanicalmi.com.
Nearby hvac companies
| Business | City | Distance | Score |
|---|---|---|---|
| Brumley Heating & Cooling | South Lyon | 0.3 mi | 32 |
| Heinanen Engineering, Inc. | South Lyon | 1.0 mi | 74 |
| Air Wizards HVAC | South Lyon | 1.1 mi | 59 |
| B's Custom Mechanical | South Lyon | 1.4 mi | 63 |
| McGraw Mechanical | South Lyon | 1.9 mi | 57 |
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Ratings and review counts come from Google Maps, read October 2026. The score comes from TownAnswer's published method. A business cannot pay to change it.