When it Comes to Heating and AC Repair in Clinton, Ingham, Eaton, Shiawassee, and Gratiot Counties, We're Tried and True

There are a lot of companies that do what we do—repair, maintain, and install HVAC equipment. But there are few with as many longstanding, loyal customers! We’re glad to be the air conditioning company so many residents of St. Johns, Dewitt, and Owosso know and trust.

Our philosophy is simple: we treat our customers the way we'd like to be treated. Before starting work, we educate you as to your options and potential costs of your air conditioning repair or ductless ac replacement. We show our respect by showing up on time, being prepared, doing quality work, and treating your home as if we were working in our own. When we’re done, you pay what was agreed upon up front and can count on us stand behind our work. When you couple that with our dedication to our customers, why would anyone in the St. Johns area go anywhere else?
Trust our techs to service your Water Heater in Owosso MI

Williams Heating-Cooling, Inc. offers the following HVAC services to people in St. Johns, Dewitt, and the surrounding areas:

  • furnace repair
  • compressor repair
  • smart thermostats
  • thermostat service
  • filter replacement
  • air conditioner repair
  • residential zoning systems
  • ductless mini-split systems
  • furnace service and cleaning
  • boiler repair and installation
  • high efficiency ac installation
  • water heater repair and replacement
  • air conditioner service and cleaning
  • high efficiency furnace installation
Check out our AC repair service in Dewitt MI
Amana Air Conditioning service in Owosso MI is our speciality.
Radiant Heat

Never step on a cold floor again! Stay warm when you let us install your infloor heating system in the St. Johns or Dewitt area!

In-Floor Heat
Call Williams Heating-Cooling, Inc. for an in-floor heating installation today!
For your next fireplace repair in Owosso MI, call Williams Heating-Cooling, Inc.

Whether you want to install a new fireplace or repair an existing one, Williams Heating-Cooling, Inc. can help!


Tired of staring at an unsightly chimney? Trust us to install a Class-A Chimney in your home for a more efficient heating outlet!

Need a chimney installation in Dewitt MI? Call Williams Heating-Cooling, Inc. today to schedule one!
Improve your indoor air quality in Dewitt MI by having a clean Ductless AC.
Air Quality

Learn more about how our IAQ services can improve your air quality and prevent mold and toxins from entering your home.

Air Quality
Water Heaters

Whether you need to replace a rusty water heater in Owosso or install a new one in St. Johns, our hot water experts have you covered.

Water Heaters
Get your Water Heater replacement done by Williams Heating-Cooling, Inc. in St. Johns MI

Cities We Service

Click on a city below to see what your friends and neighbors are saying about their recent experience with us
Williams Heating-Cooling, Inc. is a Michigan (MI) HVAC company located in Elsie. Williams Heating-Cooling, Inc. employs only the best HVAC technicians for your AC, chimney, water heater, in-floor heating, furnace, and boiler repair or replacement. We're proud to service the following communities: Ashley, Bancroft, Bannister, Bath, Brant, Chesaning, Corunna, Dewitt, Durand, East Lansing, Elsie, Eureka, Fowler, Haslett, Ithaca, Laingsburg, Lansing, Lennon, Maple Rapids, Oakley, Okemos, Ovid, Owosso, Perrinton, Perry, Saint Charles, Saint Johns, and Williamston. So, when you ask to find "A good HVAC company near me", you've come to the right place. To get a quote on your next air conditioning repair or replacement, call (989) 862-5400. Williams Heating-Cooling, Inc. services all HVAC equipment brands including Carrier, Bryant, Payne, Trane, Lennox, Rheem, Ruud, Amana, Daikin, Mitsubishi, Fujitsu, Crown, Frigidaire, Gibson, Goodman, Lochinvar, Maytag, Weil McLain, A O Smith, Kohler, American Standard, GeoExcel, General, Aprilaire, Honeywell, White Rodgers, Dynamic and Skuttle.