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Welcome to the D.E. Duffey & Sons Web Site. Our company is a full-service heating oil and HVAC contractor located in suburban Philadelphia, PA. We have been keeping families comfortable since 1898 with exceptional service and quality products.


  • Delaware Valley Fuel Dealer
  • NORA
  • Better Home Heat Council
  • Oil Heat America
  • PMAA

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We had Duffey's Install a new heating and air conditioning system in our home and we were very pleased with the job.

Steve and Nicole Brandt, Norristown

I have come to rely on Duffey's for prompt service. I also appreciate the quality in the service and products you deliver to my home.

Mark Brody, Collegeville

I was very happy with the conversion from hot air to high efficiency hot water heating and multiple air conditioning system which included a high efficiency hot water heater.

Joe Houldin, Chestnut Hill