What makes John Duffy the best in Commercial Fuel?

Our experience, customer service and quality.


John Duffy is family-owned and operated with a history spaning over four generations.

A people-first attitude and customer-driven approach defines our company values.

An authority in our field, we are devoted to providing high-quality energy solutions.


Get a FREE NEST
Wi-Fi Thermostat

Wi-Fi Nest Learning Thermostat

A $450.00 value!

with the purchase of any new Home Heating System.*

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Fall HVAC
Tune-Up
Special

$89

a $159 Value*

Tune up your HVAC equipment yearly.

Just as a tune-up for your car can improve your gas mileage, a yearly tune-up of your heating and cooling system can improve efficiency and comfort.

15 Point Precision Cooling Tune Up

  1. Test carbon monoxide levels.
  2. Clean and adjust burner and inspect heat exchanger.
  3. Check thermostat operation.
  4. Lubricate all motors, bearings, fans and circulator pumps.
  5. Clean pilot assembly.
  6. Install one 1-inch air filter supplied where applicable.
  7. Test and adjust operation of safety and operating controls.
  8. Inspect flue pipe and gas valve.
  9. Check blower motor (and belt if applicable).
  10. Test and tighten all wiring and connections.
  11. Turn exposed dampers to heating position if marked (no balancing).
  12. Flush condensate drain to protect against overflow.
  13. Check temperature rise.
  14. Check fan speeds.
  15. Inform customer of equipment condition. Recommend necessary repairs.

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John Duffy is the most trusted name in heating, air conditioning, and heating oil services in northern
and central New Jersey.

Explore Our Service Map

Office Address
465 Mulberry St Newark NJ 07114-2736

Mailing Address
P.O. Box 5610, Newark, NJ 07105