John Duffy Energy Services is one of central and northern New Jersey’s leading names in energy, commercial heating, fueling, and HVAC services. As such, we get a lot of questions, including air conditioning questions, heating questions, general energy questions, HVAC questions, and more. Here are some of the more common ones. If your question isn’t listed here, don’t hesitate to contact John Duffy Energy Services today! Maybe your question will make it to our FAQ page!