About C-N-O Comfort Zone: Heating and Cooling Services for Saint Peters C-N-O Comfort Zone is a family-owned and operated heating and cooling company in Saint Peters, providing excellent customer service and quality products for your home. Whether you need repairs right away or simply want to avoid costly problems down the road, C-N-O Comfort Zone is ready to take care of your needs. Our service technicians have the training and tools necessary to get the job done right the first time.We carry innovative, high-end Lennox® products that will help your HVAC systems run more efficiently and more reliably than the competition. Pair high-technology products with our outstanding repair and maintenance service, and you’ve found a match made in HVAC heaven. Our friendly technicians make repair challenges look easy – so you’ll be able to get back to a relaxing and comfortable home in no time. We aim to exceed your expectations by providing you with a quality product, industry expertise and outstanding customer service.C-N-O Comfort Zone is YOUR heating and cooling service, located right here in Saint Peters to meet your service and product replacement needs. Give us a call at 636-578-1777 or schedule an appointment online to learn more.