Serving St. Louis for Over 50 Years

For over 50 years,  IFS – Residential Services has been serving the St. Louis area and surrounding communities. Our dedication to providing top quality service and support has not changed since our first service call in 1966. What began as Air Masters, a 1 man service shop, has grown into a major corporation with over 300 employees and nearly 200 service vehicles.  While IFS has become one of the premier mechanical contractors in the state, our goal is, and will always remain offering stellar service to all of our customers.