Keeping Elsie, St. Johns, Dewitt, and the surrounding areas Comfortable For 110 Years
When it comes to furnace service in your home, trust the same company your grandpa did.
Schedule Service Explore Ductless Financing OptionsTrust the Furnace Company With Over a Century of HVAC Experience
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Furnaces
Our St. Johns HVAC technicians have been working on furnaces since the early days. Need a quick heating fix? Looking to get a quote on a new heating system? Leave it to Williams.
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Air Conditioners
Stay cool with confidence in Dewitt and Lansing. We install and maintain every kind of air conditioner. Obviously, we repair cooling systems as well. Just one call to (989) 862-5400 gives you access to almost a century of comfort experience.
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Air Quality
We offer air purifiers, humidifiers, and dehumidifiers to help reduce allergens, dust, and airborne contaminants. Breathe easy knowing your indoor air in St. Johns is in expert hands.
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Boilers
Boilers use water and radiators to heat your home. They’re also something our St. Johns HVAC experts are familiar with. Reach out today for boiler repair or a quote on a radiant system.
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Mini-Splits
No ducts in St. Johns? No problem. Mini-split systems are ideal for zoned comfort and energy efficiency. We install and service all kinds of ductless HVAC systems in Clinton County.
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Maintenance
Regular HVAC maintenance keeps your AC and furnace running stronger, longer. Our St. Johns maintenance plan includes priority service and repair discounts. It’s an easy way to avoid breakdowns and lower utility bills.
Ensure Efficiency
Introducing Williams
The Name Most People in St. Johns Already Know and Trust
Serving families and businesses since 1916, Williams is built on a century of trust, craftsmanship, and forward thinking. What began as a small one-man shop has grown into a full-service HVAC company. In our years in business, we've worked on everything from residential to commercial and industrial systems. We've even dabbled with agricultural ones.
In addition to standard HVAC services, we also work on water heaters and fireplaces. A testament to the fact that central systems weren’t common when we started.
Today, the company is proudly owned and operated by Deborah Brya, a woman who honors her late husband's legacy and passion as she prepares to one day pass the business on to their son. That family-driven mission guides everything we do. It's why we offer fair, flat-rate pricing and regularly invest in new technology to serve our customers better.
We believe great furnace service starts with great people. That’s why we prioritize technician training and stay ahead of the curve by quickly adapting new practices. We've witnessed the advent of everything from ductless mini-splits to window air conditioners. We know how quickly a single good idea can shake up an industry. Whether we’re installing a new boiler or servicing an old ductless mini-split, we treat every home or business like it’s our own.
Because after more than 100 years, one thing has never changed: our commitment to doing right by you.
Proud Dealer of Majestic and Vermont Castings Fireplaces
Pick up a Gas Stove, Fireplace Insert, or Fireplace that's Made in the USA.
We're picky about the products we offer our customers. This is true no matter what part of Dewitt or St. Johns you call home. When it comes to fireplaces, two brands met our strict standards: Vermont Castings and Majestic.
Majestic has been around for over 125 years. Their product line has everything you can imagine: indoor, outdoor, wood, gas, and electric. Each one is engineered for performance and long-term reliability. Their IntelliFire system makes it possible to control your fireplace from your phone.
We also proudly sell and install Vermont Castings products. The company has been around since 1975. That's given them a lot of time to perfect their craft. Their gas stoves and fireplace inserts set themselves apart with their elegance and longevity.
Not sure which one is right for you? Just give Williams Heating-Cooling a call. We'll help you find a fireplace that fits your aesthetics and lifestyle.
Proud to Be an Amana Dealer
Go for a Brand that Guarantees Its Heat Exchangers for LIFE
When we started the search for a system supplier, we put our trust in Amana. Their systems are American-made, built to last, and backed by some of the strongest warranties in the business.
At Williams, we believe in combining time-tested service with cutting-edge technology, and Amana fits that perfectly. It's a brand that aligns with our values: reliable, innovative, and focused on long-term performance.
Plus, when you pair their lifetime guarantee with our no lemon one, you get peace of mind with every furnace installation.
Since We Opened in 1916...
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1922
Carrier introduced the first centrifugal chiller.
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1927
The first "talkie" film hit theaters.
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1928
Sliced bread was invented. Still the gold standard for greatness.
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1931
The window air conditioner was invented.
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1945
The microwave oven was introduced.
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1950
Central air conditioning started popping up in homes.
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1955
Velcro was patented. Shoes breathed a collective sigh of relief.
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1959
Barbie debuted.
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1969
Humans landed on the moon.
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1971
The first email was sent.
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1983
Programmable thermostats became widely available.
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1998
Google launched.
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2006
Pluto was demoted.
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2011
Nest released the first smart thermostat.
Just $90 to Get Back on the Road to Comfort
Our dispatch fee is among the most competitive in St. Johns, and it doesn’t even amount to a dollar per year of experience!
Schedule Service Contact WilliamsOur Expertise in St. Johns Goes Beyond Standard HVAC
Radiant Floors
Heat your space from the ground up. Instead of relying on blowing air, radiant floors gently and evenly warm the entire room. These quiet systems are perfect for cold mornings in St. Johns.
Heat Your Home Bottom UpFireplaces
Before HVAC systems were commonplace, people in Dewitt relied on fireplaces. We worked on them then. And our team still repairs and replaces them.
Explore Hearthside ServicesWater Heaters
Hot water in St. Johns is a must. When your water heater starts acting up, give Williams a call. We’re happy to repair your unit or give you a quote on a new one. You can also count on us to service tankless units!
Put a Stop to Cold ShowersWant Efficiency and Flexibility in HVAC?
Consider Going Ductless in Dewitt and St. Johns
Not every home or business in St. Johns was built with ductwork. And that’s exactly where ductless HVAC shines.
Whether you’re upgrading a single room or an addition, ductless mini-splits offer targeted comfort with impressive energy savings. Williams has worked with every kind of heating and cooling system out there.
There’s a reason ductless mini-splits are one of our favorites. They're cost-effective, flexible, and a great choice for historic places in Clinton County.
Learn About Ductless Systems