Heinanen Engineering, Inc.

Heinanen Engineering, Inc. has kept South Lyon comfortable for over two decades, building a reputation on technical precision and honest advice. Founded with a commitment to treating customers like family, this licensed contractor maintains a 4.9-star average across 329 verified reviews, a volume of feedback that speaks to consistent execution. The company serves homeowners throughout the greater South Lyon area, handling everything from routine furnace maintenance to complex system replacements. Their office maintains weekday hours with emergency availability, ensuring that a broken AC unit during a July heat wave doesn't become a multi-day crisis.

What distinguishes Heinanen Engineering from the field is their status as a Trane Authorized Comfort Specialist, which means access to equipment specs, factory training, and replacement parts that independent dealers cannot match. Unlike companies that apply a one-size-fits-all template, this team performs full load calculations before recommending any system, ensuring the new furnace won't short-cycle or inflate utility bills. Several reviewers specifically mention custom-manufactured ductwork fabricated on-site to solve airflow imbalances that other contractors missed. The company also handles water heaters, water softeners, and whole-home generator installations, positioning them as a single point of contact for the mechanical systems that keep a house functional.

Reviewers who named their technician tell the most complete story. Bill Angelopoulos worked directly with owner Jeff Heinanen on a heat pump installation and continues calling the company years later for any HVAC or water issue, valuing the thorough explanations that never leave him wondering about next steps. David Majka's review describes a detailed proposal with custom ductwork, noting that the team worked inside his home with evident expertise and respect. Kenny Walkup scheduled Steve for a water heater replacement and praises the courteous arrival, estimate process, and final cleanup. These named encounters illustrate what 329 reviewers collectively describe: a team that arrives on time, explains the work, and finishes the job right.