For After Hours Please Call (815) 978-2254 A. G. Holhfelder Heating & Cooling, Inc., in Rockford, Illinois is the area's leading heating and cooling specialist serving a 30 mile radius of Rockford since 1958. We specialize in the installation and repair of heating and cooling systems, air cleaning systems, humidifiers, furnaces, boilers, water heaters and more. For all your heating and cooling needs, call A. G. Holhfelder Heating & Cooling, Inc.