Heating, Cooling, & Plumbing Service in South Lyon, MI

Thornton & Grooms has been putting people ahead of profits since we opened our doors in 1937. That's over 8 decades of doing the right thing for our customers, day in and day out, for every home service job imaginable. Over the years, we've built a reputation for honesty and integrity that can't be beaten. In fact, we've earned more 5-star reviews than any other contractor operating in South Lyon today—over 7,000 and counting!

Over 85 Years of Honest Service at Fair Prices. That's Thornton & Grooms.

Hiring Qualified Professionals:

You'll enjoy working with our licensed experts from the first call to the final handshake.

Taking a Prevention-First Approach:

Annual maintenance is proven to save you money. So we prioritize check-ups over selling new systems.

Honoring Our We Care Guarantee:

Showing we care by guaranteeing our professionalism, reputation, and convenience each day.

Service Overview

Call South Lyon's Highest-Rated Home Service Company

Thornton & Grooms makes home service repairs and replacements easier than ever before, starting from the moment you schedule your repair diagnostic or in-home estimate. You'll be surprised by how fast we can schedule your visit, sometimes as soon as the same day you call. And you'll never meet plumbers and HVAC technicians as friendly as ours. For repairs, you can expect a convenient same-day turnaround every time. As far as replacements go, you won't find a home service company that considers your budget and comfort the same way Thornton & Grooms does. It's just one of the reasons we earned the "Vote 4 The Best" customer-voted award in 2021!

Service Details

How Can We Help You Today?

  • Heating Service in South Lyon

    Thornton & Grooms can handle any repair on any brand and model of heating system in operation today. If you have an older system that you aren't quite ready to let go of, you can bet we'll do everything in our power to keep it running. Our licensed and high-qualified experts can diagnose and fix most furnace or heat pump repairs in just one visit to your home. Last but not least, if you're ready for a brand new system, we're the best choice you can make for a comfort specialist. We've got more systems and better deals than anywhere else, and you can start right on our website with our Comfort Survey.

  • Cooling Service in South Lyon

    When summer comes along and cooling systems break down, homeowners in South Lyon turn to Thornton & Grooms to get them their comfort back fast. We've been repairing and replacing air conditioners since air conditioners were a thing. Really, we were one of the first companies in the state to install and repair them! Not to mention, we make things easy for our customers by providing convenient same-day repairs, and better customer support. That includes our "We Care" Guarantee, which ensures you receive the 5-star service you deserve every time.

  • Plumbing Service in South Lyon

    Need a drain unclogged or hot water restored? Thornton & Grooms provides fast and dependable plumbing services. Our plumbers and drain technicians can handle any job, from drain cleaning to replacing water heater systems.

    We provide peace of mind to homeowners in South Lyon by meeting rigid trust certification standards and backing up our plumbing installations and repairs with guarantees in writing. For example, our "We Care" Guarantee has guided every plumbing project we have taken on since we opened our doors.

    If you're looking for a plumbing contractor with easy-to-schedule appointment options and a great reputation in South Lyon, look no further than Thornton & Grooms.

Home Care Club

Join the Home Care Club and Save on Home Services

Get lower monthly energy bills and avoid expensive A/C repairs by joining the Home Care Club. With bi-annual HVAC check-ups, our comfort specialists will catch small issues before they snowball into costly fixes. Plus, with yearly maintenance, you’ll keep your A/C equipment under warranty for as long as possible.

Additionally, plan members receive:

  • Markdowns on HVAC, plumbing, and drain repairs
  • Discounts on comfort system replacements
  • Extended warranties
  • Lower service fees
  • And more...


Celebrating 85+ years of service in the great state of Michigan

Had all the equipment right there on his truck…

"Rodney from Thornton & Grooms came out bright and early and quickly identified the source of the problem (a crack in the garbage disposal). He offered me several options from which to choose and had all the equipment right there on his truck. Rodney set to work quickly and efficiently and in no time had the new garbage disposal installed and functioning perfectly. He is very knowledgeable in plumbing matters, and I felt very comfortable with his expertise. He was friendly and polite to my elderly mom. I would ask for Rodney again if I had another plumbing issue. 5 Stars."

-—Rita F. | South Lyon

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Guarantees You Won't Find Anywhere Else

We promise to provide our customers with 5-star service—no matter what. If you are not satisfied with our level of service at any point, we ask that you inform us so we can make it right before we leave your home.

Real Guarantees
  • Professionalism

    We are a team of skilled, knowledgeable professionals who undergo regular training to provide top-notch service and solutions at a fair cost.

  • Reputation

    We truly care about providing 5-star service to our customers and our community. With thousands of Google reviews (we reply to each one!), it seems our customers agree.

  • Convenience

    We know customers already have enough to deal with, so we offer friendly and convenient service from the first call to our post-service process.

Schedule Your Home Service Visit in South Lyon with Thornton & Grooms Today