WELCOME TO MISSOURI FURNACE For over 50 years, Missouri Furnace & Air Conditioning has provided quality service for air conditioning and heating needs. Our great customer support and established relationships have made Missouri Furnace & Air Conditioning a household name in St. Charles, St. Louis and the surrounding areas. We proudly service all makes and models and are equipped to handle your requests, from duct cleaning to new system installations. Our team of technicians are committed to keeping up to date on the latest technologies, which means you will receive reliable products and services that exceed industry standards. Have peace of mind knowing that we stand behind our products and installation and strive to ensure you are 100% satisfied.