Welcome to D.E. Duffey & Sons, your trusted, local, 4th generation total home comfort partner.  Since 1898, suburban Philadelphia home-owners have trusted us to provide fair pricing on home heating oil as well as heating and AC system service, maintenance and installations. After 120 years, we continue to strive to meet the ever-changing needs of the communities we serve through an unwavering commitment to delivering an exceptional level of service for our customers.  This is our promise, it is who we are, and what we do each and every day.  It is what has driven our growth for over a century and it is what will fuel our continued growth in the future.  It is the “Duffey Difference.” To do so, D.E. Duffey offers the best high efficiency heating and cooling systems from Rheem, Fijitsu, Burnham, Lockinvar, Energy Kinetics and more – installed and serviced by the best technicians in the area.