We are experts in working with different makes and models of residential HVAC units.
Years of Experiences

What Makes John Duffy The Best In HVAC?

We are experts in working with different makes and models of residential HVAC units.

Having been in business since 1891 (yes, you read that right), we’ve seen and fixed practically every type of heating, ventilation, and air conditioning-related problem. When you choose to use our services, you may rely on our extensive knowledge and experience as well as our industry connections. Besides, all our technicians come with the required training and licensing.


Home Services John Duffy Services For Your Home

John Duffy Services For Your Home
Home Cooling & Heating Oil in NJ - John Duffy Energy Services
  • Heating Services
  • Boilers
  • Furnaces
  • Water Heaters
  • Thermostats

Heating Oil What Kind Of Service Do You Need?

Home Heating Oil in NJ - John Duffy Energy Services
  • Heating Oil Delivery
  • Easy Payment Plan
  • Service Plan
  • Tank Protection
  • Repair/Maintenance
  • Price Protection

Special Offers Save Big With Rebates And Discounts

  • Get A Free Nest Wi-Fi Thermostat
  • All HVAC Tune-Up Special
  • $500 Off New System
  • Free In-Home Comprehensive Assessment

Frequently Asked Questions FAQs

How often do air filters need to be changed?

It varies depending on the type of filter you have. If you have cheaper, disposable filters, we recommend changing them every 30 days. If you have pleated, or poly, filters, we recommend changing them every 90 days. Media filters or Clean Effects filters can last a little longer and should be replaced about once a year.

Do bigger air conditioning units perform better?

Not necessarily. It is important to purchase an air conditioner that is the right size for your home. If you buy an AC unit that’s too big, it will cool your home faster, but it will also be less efficient and will not eliminate humidity well enough. It will have short-run cycles. While it will cool the air quickly, it will shut off before it blows enough air across the indoor coil to drain water from your system. This will leave too much moisture in the air, which can lead to mold and mildew in your home.

Your system starting and stopping more often may cause it to use more energy+ and wear down faster. Longer run cycles are more efficient.

How long does HVAC equipment last?

HVAC systems generally last 10 to 15 years. However, your system becomes less efficient and performs worse as it gets older. Therefore, after about 10 years, you may want to start looking for a replacement. Even if you are not having any major problems, modern HVAC systems will save you money on your energy bills because they are more efficient. Plus, they generally come with 10-year warranties, so you won’t need to worry about replacing them for quite a while.

If I have an older system, can I save money by just replacing the outdoor unit?

Probably not. Older systems use Freon R-22, which has been phased out and replaced with Freon R-410A, also known as Puron. Puron is more environmentally friendly and more efficient. In addition, the minimum SEER rating or efficiency that we can use today is 13 SEER (older systems are 10 SEER and below). The refrigerant and efficiency rating of your indoor coil and outdoor unit must be the same, so you have to replace the whole system at once.

Why do I need a system with matched components?

Matched systems ensure maximum performance, maximum efficiency, and maximum comfort.
A matched system will maintain proper cycle times and manage humidity properly for your home. In addition, a matched system will prevent you from paying too much for your energy bills. Your system will run at peak efficiency, with no energy wasted due to improper size.

What are the advantages of high-efficiency air filters?

Proper air filtration is crucial to the health of both your HVAC system and your family. Air filters prevent dust and dirt from building up in your system to keep it performing at its best. High-efficiency filters do a better job of this and remove dust, dirt, mold, and more from the air. This is especially useful if you have allergies or respiratory issues. High-efficiency filters are better but not 100% necessary. Whether or not you choose to use them, remember to change your filters regularly.