AC Service in St Charles, MO

Same-Day Service Available | Family & Locally Owned | Competitive Pricing

Same-Day Service Available

Family & Locally Owned

Competitive Pricing

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Let Us Repair or Replace Your Air Conditioner

When it comes to the professional AC service OFallon, MO has relied on for years, CNO Comfort Zone Heating and Cooling is the place to call! If you're experiencing problems with your unit or are looking for a new installation, we've got your back. Our team of experts prioritize customer satisfaction above anything else and want to make sure your home is always comfortable and cool. Ready to get started? Call our office today if you're looking for professional AC service in St Charles, MO. We look forward to hearing from you and working with you in the near future!

Reliable AC Service in OFallon, MO for Your Home and Business

When it comes to keeping your home cool and comfortable, you need an air conditioning service provider you can trust. Our team of experienced professionals is dedicated to delivering top-quality AC repairs, installations, and maintenance, ensuring your system runs efficiently all year long. Whether your unit needs a quick fix or a full replacement, we have the expertise to get the job done right.

CNO Comfort Zone Heating and Cooling can repair and service almost any residential and commercial cooling unit with ease. From installations to repairs, our team can help with all your air conditioning needs. We also provide thorough maintenance and inspection services.        

Fast and Efficient AC Service in St Charles, MO You Can Depend On

We understand the importance of having a fully functioning air conditioner, especially during the hottest months of the year. That’s why we offer prompt service, often providing same-day estimates for new installations. Our skilled technicians are trained to work on all makes and models, so you can rest assured that your AC system is in good hands.

Customer Satisfaction and Quality Guaranteed

Your comfort is our priority. With competitive warranties and a commitment to excellent service, we strive to exceed expectations with every job. Contact us today!


We're an approved contractor for Spire and Ameren Missouri. Call us at (636) 578-1777 for a free estimate today. In some cases we can get your estimate for new installations on the same day!

Complete Air-Conditioning Services

  • Repairs
  • Installation
  • Service
  • Replacement
  • Maintenance
  • Indoor air quality
  • Utility rebates
  • Spring and fall maintenance
  • Inspections
  • Zone systems installation and maintenance
  • Warranties:
  • 90 days on parts
  • Two weeks labor warranty on service calls
  • 10-year parts warranty
  • One-year labor warranty and up to 10-year labor warranty

Affordable Air Conditioning Services

Call us for a free estimate

(636) 209-5087

(636) 209-5087

I am very impressed with this company. I was with another for years and years, decided to change and I am so glad I did. Very nice people all the way around, excellent and good service. Thank you so much.

- Joanne J, Google reviews

Spring Clean and Tune-Up Special
$79.00
$79 for your Spring Clean and Tune-Up. From CNO Comfort Zone Heating and Cooling.
Use This Coupon
EXPIRED
System Installation
$100 OFF
Get $100 off a complete HVAC system installation ​from CNO Comfort Zone Heating and Cooling. Coupon must be redeemed prior to installation.
Use This Coupon
EXPIRED
Service Call
$25 OFF
Must mention coupon when booking appointment. From CNO Comfort Zone Heating and Cooling.
Use This Coupon
EXPIRED

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CNO Comfort Zone Heating and Cooling

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