Find Comfort With C-N-O Comfort Zone

Heating & cooling installation, service & repair in St. Peters, MO


Not finding comfort with your current heating or cooling system? You might need a new installation or repair. Let C-N-O Comfort Zone provide you with comfort today. We are a small, family-owned business with over 15 years of experience. We not only have the skills, but also the top-notch equipment and products to keep you comfortable and satisfied. Whether you need a heating or cooling system replaced or installed in your home, we have the quality service for you.

We provide affordable, professional and reliable products and services. Our business is insured and BBB accredited, which means you are guaranteed quality comfort. Choose a business that makes you their top priority. We strive to provide you with the best services to fit your needs.

Top products that C-N-O Comfort Zone can provide for you:

  • Gas furnaces
  • Electric furnaces
  • Air conditioners
  • Heat pumps
  • Humidifiers
  • Air cleaners
  • UV lamps
  • Thermostats


Heating and cooling problems require immediate care. Call 636-578-1777 and make an appointment now. We make it our goal to provide you with fast and superior service within the same day.

High-quality brands & free estimates

No matter what type of air-conditioning or heating system you have, we have the product and service for you. We carry many name brand air conditioners, furnaces and replacement parts. We offer brands such as Lennox, Coleman, Goodman and more. We also provide free estimates on new furnaces, air conditioners or complete system replacements. Schedule a consultation with us today to learn more about our preferred brands, specials, and estimates.



We Offer Flexible & Convenient Financing on Lennox Systems!

To prequalify for a high-quality Lennox HVAC for your home:

1) Visit the Lennox Website by following the link below

2) Fill out your information and submit to CNO Comfort Zone through the Lennox Website

3) Wait for CNO to reach out to you with available financing options!



  • CNO Comfort Zone

    1124 Carrington Dr.
    St. Peters, MO 63376

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    Call Us
    Phone: (636) 578-1777

    Hours
    Mon: 8:00AM-8:00PM
    Tue: 8:00AM-8:00PM
    Wed: 8:00AM-8:00PM
    Thu: 8:00AM-8:00PM
    Fri: 8:00AM-8:00PM
    Sat: 8:00AM-8:00PM
    Sun: Closed