Your Heating & Cooling Expert

We'll keep your home and family comfortable year-round.

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We Do it All - Give Us a Call! 618-694-7699
From furnace or AC repair, to upgrading your old indoor comfort system, we have you covered.

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We install furnaces, boilers, heat pumps, mini-splits, AC units, rooftop & commercial refrigeration units. Is it time to upgrade your heating & cooling system? See if you quality for the IRA 25(c) tax credits. Call today to see how much money you can save now and for years to come in lower utility consumption.
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Our trained service technicians will diagnose and service your indoor comfort system. Our expertise in commercial walk-in or reach-in refrigeration units is second-to-none. Need a rooftop unit, unit heater, or radiant tube heater checked out? Give us call. You'll be glad you did!
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Statistics show annual maintenance ensures your heating and cooling system runs at optimum efficiency, increases the life of your equipment, and decreases the number of repairs. Call today for a residential or commercial maintenance agreement.

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Welcome to John's Mechanical Services
Commercial & Residential Indoor Comfort Specialist

John's Mechanical Services is Southern Illinois' top choice when it comes to professional heating, cooling, ventilation, and commercial refrigeration. Our technicians are second-to-none in diagnosing your heating system; whether it be a gas furnace, heat pump, roof top unit, boiler, or ductless mini-split. We provide fast HVAC service in the dead of winter or the heat of summer. We'll give you the options to service or upgrade your indoor comfort systems. We stand behind our 100% customer satisfaction guarantee. If you’re not totally satisfied with our work, then we promise to make it right.

Click ENERGY STAR RECOMMENDS to see when is the right time to replace your heating and cooling system.

Have you had your commercial boiler serviced this year? If you are an Ameren client, did you know they offer rebates on boiler maintenance? Call us today to see if you qualify.

We can repair your roof top unit, service unit heaters and radiant tube heaters, and provide comprehensive HVAC maintenance agreements for your business, church, or warehouse.

Are you needing service on your walk-in freezer or refrigeration unit? Our technicians have serviced many manufacturers' equipment; from AmeriKooler and True, to Manitowoc and Traulsen. 

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Our Residential Services

 Residential Heating, Air Conditioning, Ventilation and Indoor Air Quality.

Commercial Services
Whether it's heating or cooling, we can handle all of your business comfort needs.

Sales, service and repair HVAC systems.
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Why Choose Us?

At John's Mechanical Services, we know there are plenty of heating and cooling companies to choose from in Marian and the surrounding communities. However, not all companies have the same high standards we have. For instance, we thoroughly screen all our applicants and make sure they pass a background check and drug test before they join our team. We only employ technicians with the certifications and expertise necessary to do every install and/or service; and do it very well. When it comes to quality and customer service, we take no shortcuts.

Locally Owned & Operated
We are a local family-owned company right here in Marion that cares about our customers and the communities we serve. We stand behind all of our work with a 100% Money-Back Guarantee!

Superior Craftsmanship
All of our technicians are highly trained and experienced in both residential and commercial heating and cooling. We only use quality parts from the top manufacturers.

Fully Licensed & Insured
We're are a team of professionals, fully licensed and insured for the safety of our customers and employees.

Affordable Pricing with No Surprise Fees
We keep our prices competitive to offer our customers the most value. We also won’t try to sell you anything that you don’t need. Remember, quality doesn't cost, it saves!
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Contact Us Today to Schedule an Appointment

John's Mechanical Services 's licensed and certified technicians can tackle even the toughest heating and cooling challenges. Contact us today for a free estimate or to request service.

Hours of Operation : Monday- Friday
7am- 4:30pm
Emergency Services 24/7

Request A Quote
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Peace of mind feels good!
Our 100% Customer Satisfaction Guarantee

We are a locally owned and operated HVAC company right here in Marion that cares about our customers and the communities we serve. We're dedicated to providing the best products and services at fair and competitive prices, all backed by our satisfaction guarantee. If you're not 100% happy, simply let us know and we will do everything we can to make it right. We appreciate your business and look forward to serving with you.
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Service Area
We are Proud to Serve Marion, Illinois and the Surrounding Communities Including:

• Marion

• Herrin

• Pittsburg

• Carbondale

• Harrisburg
• Carrier Mills

• Eldorado

• Carterville

• Colp

• Murphysboro
• Johnson City

• West Frankfort

• Creal Springs

• New Burnside

• Goreville

Get in Touch or Request a Quote

Give us a call or send us a message using the form below.