Gas Furnace vs Oil Furnace in New Jersey: Which Is Better for Your Home?

Quick answer: In most of New Jersey, a gas furnace is the simpler choice: no fuel deliveries, no storage tank, less maintenance and very high efficiency in modern models. Oil furnaces still heat many older and rural homes, especially where gas mains do not reach, and they work well when they are cleaned every year. If your street has natural gas and your oil system is aging, switching to gas (or to a heat pump) is often worth pricing out. We install gas furnaces and heat pumps across Ocean, Monmouth, Burlington and Middlesex counties; see furnace and heat pump installation.

Heating is the biggest energy bill for most New Jersey households, so the fuel you use matters. This guide compares gas and oil furnaces on the points homeowners care about: cost, maintenance, comfort, safety and long-term plans.

How common is each fuel in New Jersey?

According to U.S. Census Bureau estimates, about three quarters of occupied homes in New Jersey heat with natural gas, with electricity second and fuel oil a smaller share. Oil is much more common in some towns than others. In parts of rural Ocean, Monmouth and Burlington counties, a quarter or more of homes still use oil, while many suburban and shore towns are mostly gas. Each of our town pages shows the heating fuel mix for that town.

How a gas furnace works

A gas furnace burns natural gas (or propane) in a burner, heats a metal heat exchanger and blows air across it into your ductwork. Combustion gases are vented outside. High-efficiency models capture extra heat from the exhaust and drain condensation, which is why they vent through plastic pipe and have a condensate drain.

Pros

• Fuel arrives through a pipe, so there are no deliveries or tank to watch
• Modern high-efficiency models turn most of the fuel's energy into heat
• Cleaner burning, with less soot and simpler yearly maintenance
• Pairs easily with central air and with a heat pump in a dual-fuel system

Cons

• Only available where a gas main reaches your street (otherwise propane is the alternative)
• Requires proper venting, gas piping and a working carbon monoxide alarm

How an oil furnace works

An oil furnace pumps heating oil from a tank to a burner nozzle, sprays it as a fine mist and ignites it. The flame heats a heat exchanger, and a blower moves the warm air through the ducts. Exhaust leaves through a chimney or a direct vent.

Pros

• Works anywhere, with no gas main needed
• Strong, hot heat output
• Many oil systems run reliably for decades with good care

Cons

• Needs fuel deliveries and a storage tank (indoors or outdoors)
• Soot builds up, so a yearly cleaning is essential
• Usually less efficient than a modern high-efficiency gas furnace
• Tanks age and eventually need replacing or removal

Running costs

Fuel prices for both natural gas and heating oil change from year to year, so any fixed comparison goes out of date quickly. What stays true:

• Efficiency matters as much as fuel price. A modern high-efficiency gas furnace wastes far less fuel up the chimney than an older oil furnace.
• Maintenance adds up. Oil systems need more hands-on yearly service.
• The home matters. Insulation, air sealing and ductwork affect your bills as much as the furnace. See lower heating and cooling bills.

The best way to compare is to look at your own last year of bills and the efficiency of the equipment you would install.

Maintenance

Gas furnace: a yearly check of the burner, igniter, flame sensor, safety switches, venting and carbon monoxide, plus regular filter changes.

Oil furnace: a yearly cleaning of the burner and heat exchanger, a new nozzle and oil filter, a combustion test and adjustment, and a check of the tank and oil line. Skipping the cleaning lets soot build up, which wastes fuel and can cause breakdowns.

See the seasonal maintenance checklist.

Safety

Both fuels are safe when the equipment is installed and maintained properly. Every home with fuel-burning equipment should have working carbon monoxide alarms on each level and near bedrooms. Gas homes should know the smell of gas (a rotten-egg odor) and what to do: leave the house and call 911 or the gas utility from outside. Oil systems should be checked for leaks at the tank and lines. See carbon monoxide safety.

Comfort

Both gas and oil furnaces deliver warm air quickly. Comfort depends more on correct sizing, ductwork and controls than on the fuel. A two-stage or variable-speed furnace of either type runs longer, quieter and more evenly than a basic single-stage unit. See how to size a furnace or heat pump.

When does switching make sense?

Consider switching from oil when:

• A gas main reaches your street. Your gas utility can confirm and quote the service line.
• Your oil furnace or tank is old. Combining the switch with a needed replacement saves money and disruption.
• You want less maintenance and no deliveries.
• You plan to stay in the home long enough to benefit from lower running costs.

If gas is not available, a modern heat pump is another option, often paired with your existing furnace as a dual-fuel system. See propane and oil heat vs heat pumps and heat pump vs furnace.

What a switch involves

1. Gas service: the utility runs a service line and installs a meter.
2. New equipment: a new gas furnace (or boiler) sized for your home, with proper venting.
3. Gas piping: a licensed contractor runs piping to the furnace and other appliances.
4. Oil tank: the old tank is removed or properly abandoned according to local requirements.
5. Permits and inspection: the work is permitted and inspected.

Read the full oil-to-gas conversion guide.

What about boilers?

Many New Jersey homes heat with a boiler and radiators or baseboard instead of a furnace. The same fuel question applies: gas boilers are common where gas is available, and oil boilers are common in older and rural homes. Modern gas boilers and tankless combi boilers can also make your hot water, which saves space and removes a separate water heater. If your home has radiators, see boiler vs furnace and combi boilers.

Propane: the third option

Where there is no gas main, propane is often the alternative to oil. Propane furnaces work much like natural gas furnaces and can reach high efficiency, but propane is delivered and stored in a tank like oil. Many rural homeowners compare propane, oil and a heat pump side by side. The right answer depends on fuel prices in your area, your home's insulation and how long you plan to stay.

Questions to ask before you decide

• Is gas available on my street, and what will the utility charge for the service line?
• How old are my furnace and oil tank, and what condition are they in?
• What efficiency would a new system have?
• Would a heat pump or dual-fuel system suit my home better?
• How long do I plan to stay?

Get honest advice

We are a family-owned, veteran-owned company led by a licensed NJ Master HVACR contractor (25 years of experience) and a founder with 40 years in heating and cooling. We will look at your home, explain your options and give you an upfront quote, with $500 off a new heating system (terms apply). We serve every town in Ocean, Monmouth, Burlington and Middlesex counties, including Jackson, Howell and Manalapan. Book online or call for a free estimate.