Welcome to D.E. Duffey & Sons, your trusted, local, 4th generation home comfort partner.  Since 1898, suburban Philadelphia home-owners have trusted Duffeys to provide complete comfort solutions for their families.  We have experienced a lot in nearly 120 years, as have our loyal customers.  But throughout that time we have continually evolved to meet the ever-changing needs of the communities we serve.  We have done this through an unwavering commitment to delivering an exceptional level of service for our customers in everything that we do.  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.  While we are extremely proud of our past, Duffeys remains on the cutting edge of our industry. We offer the latest in high efficiency heating and cooling systems and a team of installation and service professionals that are truly the best around.  We believe that this is a perfect combination of past and future and, along with our commitment to the customer experience, positions Duffeys as the clear choice as your complete comfort partner.