Dan Donnelly offers only the finest of service and installation from industry leading certified repair personnel.. Service and installation of furnaces,air conditioning systems,heat pumps,hot water heaters,boilers,humidifiers and air cleaners in residential and light commercial structures. Fabrication,install and repair of ductwork. Service maintenance contracts. Service all makes and models with the exception of window air conditioning units. 24-HOUR EMERGENCY ON-CALL SERVICE. FREE REPLACEMENT CONSULTATION - FREE ON-SITE ESTIMATES PROVIDED