Cornerstone Mechanical LLC

Cornerstone Mechanical LLC holds a 5-star rating across 9 client reviews, establishing its reputation as a trusted heating and cooling contractor serving South Lyon, Detroit, and the broader Oakland County region. The company operates from South Lyon and extends services to neighboring communities including Novi, Wixom, Milford, Brighton, and Whitmore Lake. With more than two decades of hands-on experience in Michigan's demanding climate, the team handles residential furnace repairs, air conditioning installations, and water heater services. The business maintains 24/7 emergency availability, ensuring homeowners can reach qualified technicians regardless of when heating or cooling systems fail.

What distinguishes Cornerstone Mechanical from neighboring contractors is their commitment to transparent pricing and comprehensive equipment expertise. The company works across all AC brands and offers both tank and tankless water heater solutions. Reviewers consistently note the team's ability to arrive with the necessary parts already stocked in their service vehicles, eliminating multiple visit delays. The business guarantees satisfaction on every completed job, and their technicians pull required permits and ensure installations pass local inspections.

Customers frequently highlight specific technicians who exceeded expectations during challenging situations. One reviewer described how Justin arrived with parts already on the truck, completing a central air repair in short order after troubleshooting the issue rapidly. Another customer recounted how Justin and Dara identified underlying problems with a more than 20-year-old air conditioner during a furnace visit, ultimately guiding the homeowner toward a full system replacement. A third reviewer praised the team's thorough communication throughout a project, noting they went beyond the original scope to finish timely while maintaining a clean worksite.