The AhTown Guide to Heating and Air Conditioning in New Jersey

Cost by size

Other sources run lower. PickHVAC (June 2025) lists a 3-ton replacement at $3,000 to $6,500. Get more than one quote.

What does it cost in New Jersey?

HVACProjectCost (July 2026) estimates $4,500 to $10,000 for central AC in NJ, and $8,500 to $17,000 for AC and furnace together. It puts North Jersey 15 to 20% above the state average and South Jersey 5 to 10% below. We found no NJ contractor that publishes its prices.

What drives the price?

• Size: based on a load calculation, not square footage alone. See what size you need
• Efficiency: higher SEER2 ratings cost more up front
• Ductwork: repairs or replacement can add thousands
• Matching: replacing the indoor coil along with the outdoor unit
• Permit: required in NJ for a replacement. See HVAC permits

Check NJ rebates before you sign.

Furnace cost

One NJ estimate (HVACProjectCost, July 2026): $3,500 to $8,500 for a gas furnace.

Boiler cost

What does converting from oil to gas add?

Are there rebates?

Yes. NJ gas utilities pay $850 to $1,750 toward high-efficiency furnaces and boilers. See NJ HVAC rebates.

Ducted heat pumps

One NJ estimate for replacing an existing heat pump: $6,500 to $15,000 (HVACProjectCost, July 2026).

Ductless mini splits

Do heat pumps work in NJ winters?

Yes. Cold-climate heat pumps are rated to keep heating down to -13°F, well below typical New Jersey lows. Some homeowners keep their furnace or boiler as backup, which utilities call a hybrid or dual-fuel setup.

What rebates apply?

JCP&L lists up to $1,000 for an air-source heat pump and $750 for a ductless mini split. PSE&G has larger incentives for switching a whole home from fossil fuel heat. The federal tax credit ended after 2025. Details in NJ HVAC rebates.

Rebates by utility

Programs and amounts change. Confirm with your utility before you sign, and ask whether your contractor must be a participating contractor.

Is there still a federal tax credit?

No. The IRS says the Energy Efficient Home Improvement Credit applies to equipment placed in service before the end of 2025. There is nothing for 2026 installations.

What about converting to a heat pump?

PSE&G's building decarbonization program has larger incentives for replacing fossil fuel heat with heat pumps. A participating contractor lists up to $10,000 or 50% of the project cost. Confirm current terms with PSE&G.

How do you claim a rebate?

• Choose equipment that meets the efficiency level on the rebate form
• Use a licensed contractor, and a participating one if the program requires it
• Keep the invoice with model numbers
• Apply inside the deadline. Elizabethtown Gas, for example, requires applications within 120 days

The $5,000 rule

Age of the system × cost of the repair.

It's an industry rule of thumb, not a government standard. Treat it as a starting point.

Signs it's time to replace

From ENERGY STAR:

• The AC or heat pump is over 10 years old, or the furnace or boiler is over 15
• It needs frequent repairs
• Your energy bills keep rising
• Some rooms are too hot or too cold
• The house is humid, dusty or noisy

When does repair make sense?

• The system is under 10 years old
• The repair is a common part: a capacitor, igniter or fan motor
• It's still under the manufacturer's warranty

See common repair costs.

What else should you factor in?

• Rebates: utilities pay toward efficient replacements. See NJ rebates
• Refrigerant: systems that use the phased-out R-22 are expensive to recharge. See refrigerant changes
• Timing: replacing before it fails lets you compare quotes instead of buying in an emergency

Typical lifespans

These assume regular maintenance.

What shortens the life of a system?

• Skipped maintenance. ENERGY STAR recommends a checkup before each heating and cooling season
• Dirty filters. They make the system run longer and hotter
• Wrong size. An oversized unit switches on and off constantly. See sizing
• Poor installation. ENERGY STAR says improper installation can cut efficiency by up to 30%

How do you find your system's age?

Look at the data plate on the outdoor unit or inside the furnace door. The manufacture date is often printed there, or built into the serial number.

The yearly schedule

The CDC also recommends having fuel-burning appliances serviced every year to prevent carbon monoxide problems.

What does maintenance cost?

Which air filter should you use?

The EPA suggests upgrading to a MERV 13 filter, or the highest rating your system's fan and filter slot can handle. Check the manual or ask your technician first, because a filter that's too restrictive can strain an older system.

Is a maintenance plan worth it?

It can be if it includes both seasonal visits and priority service. Compare the plan price to two single tune-ups, and read what's actually covered.

What else helps?

ENERGY STAR says sealing leaky ducts can improve efficiency by as much as 20%.

Common repairs

What does emergency service cost?

$140 to $250 an hour. If the house is safe and the weather is mild, waiting for regular hours saves money.

When is a repair not worth it?

A compressor or evaporator coil on a system over 10 years old is usually the point to price a replacement too. See repair or replace.

What should the invoice show?

• The diagnostic fee and whether it's credited toward the repair
• The part replaced
• The contractor's NJ license number, which is required on invoices

What does NJ law require?

• License: no one may work as, or advertise as, an HVACR contractor without a Master HVACR Contractor license (N.J.S.A. 45:16A-7).
• Insurance: $500,000 in general liability coverage.
• Bond: a $3,000 surety bond.

What must be on the truck and paperwork?

• Both sides of commercial vehicles: the business name, the contractor's name and license number
• The license number on correspondence, invoices and all advertising, including websites

A truck or estimate with no license number is a warning sign.

How do you check a license?

Search the contractor or business at newjersey.mylicense.com/verification, New Jersey's license lookup, and confirm the license is active. Complaints go to NJ Consumer Affairs at 800-242-5846.

Do the technicians need anything else?

Yes. Anyone who services equipment containing refrigerant must hold EPA Section 608 certification, a federal requirement.

Is home improvement contractor registration required too?

New Jersey's home improvement registration law exempts people licensed by the state in a related profession when they work within that license. HVACR contractors aren't named in the exemption but fit its wording. The license to check is the HVACR license.

What needs what?

How does minor work go?

1. The contractor notifies the town's construction office before starting. Notice can be oral or written.
2. Work proceeds.
3. The permit application is filed within five business days of the notice.
4. The town inspects within three business days of the request.

Why does this matter to you?

• A no-heat emergency in January doesn't have to wait for paperwork
• You should still end up with a permit and a passed inspection. Ask for proof
• A contractor who says a replacement needs no permit at all is wrong

What is Manual J?

It's the standard method from the Air Conditioning Contractors of America for calculating how much heating and cooling a specific house needs. It accounts for:

• Insulation and air leaks
• Window size, type and direction
• Ceiling height and layout
• Local climate
• How many people live there

Why is bigger worse?

The Department of Energy says oversized systems can cost too much, provide inadequate comfort, and lead to mold and poor indoor air quality. An oversized air conditioner cools the house fast, then shuts off before it removes humidity. The constant starting and stopping also wears it out.

Is “one ton per 500 square feet” accurate?

No. Federal research warns against sizing by floor area. Two homes of the same size can need very different systems.

What should you ask?

• Will you do a Manual J load calculation, and can I see it?
• Are you replacing with the same size as the old unit? Why?
• Have you checked the ductwork? ENERGY STAR says to expect a home evaluation before a quote.

What do the ratings mean?

Higher is more efficient. Utility rebates usually require ratings above the minimum.

What happened to R-410A?

• New residential systems using R-410A can't be manufactured or imported since January 1, 2025. New equipment uses lower-impact refrigerants.
• In 2026, the EPA removed the deadline for installing leftover R-410A equipment built before 2025, so some contractors may still offer it.
• Parts and refrigerant for repairing existing systems aren't restricted.

What about older R-22 systems?

R-22 production and import ended in 2020. The EPA doesn't require you to replace or convert an R-22 system, but it can only be recharged from recovered or reclaimed supply, which makes leaks expensive to fix.

What should you ask a contractor?

• Which refrigerant does this system use?
• When was the equipment manufactured?
• Does it qualify for my utility's rebate?

AC not blowing cold air

Common causes, from Carrier:

Furnace blowing cold air

When is it an emergency?

If you smell gas or a carbon monoxide alarm sounds, leave the house first. See gas smell and carbon monoxide.

NJ gas emergency numbers

Or call 911.

If you smell gas

From PSE&G:

• Leave immediately and get at least 350 feet away
• Don't use light switches, phones, matches or anything that could spark
• Don't start a car near the building
• Call from a safe distance

What are the symptoms of carbon monoxide poisoning?

The CDC lists headache, dizziness, weakness, upset stomach, vomiting, chest pain and confusion. If several people in the house feel sick at once, or feel better when they leave, get outside and call 911. NJ Poison Control is 800-222-1222.

Where do CO alarms go?

• The Consumer Product Safety Commission says on every level of the home and outside sleeping areas
• New Jersey requires them near sleeping areas in one- and two-family homes that have a fuel-burning appliance or an attached garage

How do you prevent it?

The CDC says to have fuel-burning appliances, including your furnace or boiler, serviced every year.

Run the numbers

It's a rule of thumb, not a standard. On a very old furnace, a cheap repair still makes sense. It lets you shop for a replacement in spring instead of in a cold snap.

What's a belt-drive blower?

Older furnaces often turn the blower fan with a rubber belt from a separate motor, like a fan belt in a car. Belts stretch, squeal and break. A belt is a small part. The motor, the bearings and the blower itself are bigger jobs.

When is repair the wrong call?

• A cracked heat exchanger. It can leak carbon monoxide. Furnace heat exchangers last about 10 to 15 years, according to InterNACHI
• Repeated breakdowns in the same season
• A carbon monoxide alarm going off. Leave the house and call 911 or your gas utility. See gas smell and CO

How do you find a tech who repairs, not just sells?

1. Ask on the phone: “Do you repair older furnaces, or only replace them?”
2. Ask for a written diagnosis that names the failed part and the repair price
3. If you're told the heat exchanger is cracked, ask to see the crack or a photo
4. Get a second opinion before replacing a furnace that's heating
5. Check the NJ HVACR license number, which must be on the invoice and the truck. See checking a license

If you do replace it

A new gas furnace typically costs $3,800 to $12,000 installed, and NJ gas utilities pay rebates toward efficient models. See furnace costs and rebates.

Ten questions to ask

1. What's your NJ Master HVACR license number?
2. Can you send proof of your $500,000 liability insurance?
3. Will you do a Manual J load calculation?
4. What are the exact model numbers and efficiency ratings?
5. Which refrigerant does it use?
6. Does it qualify for my utility's rebate, and who files the paperwork?
7. Who pulls the permit and schedules the inspection?
8. What's the warranty on parts and on labor?
9. Is the price itemized: equipment, labor, ductwork, permit, removal of the old unit?
10. Are your technicians EPA Section 608 certified?

What does ENERGY STAR recommend?

• Know your state's license and insurance requirements
• Ask for referrals and call references
• Look for rebates
• Expect a home evaluation
• Get written, itemized estimates and compare cost, efficiency and warranty
• Put the agreement in writing

Red flags

• No license number on the truck, estimate or invoice
• A quote by phone with no visit
• Sizing by square footage or “same as the old one”
• “You don't need a permit for a replacement”
• Pressure to sign today

Where do you find one?

AhTown features one company per trade per ZIP code in New Jersey. HVAC listings are opening soon. Featured Pros pay for placement. AhTown does not endorse, verify or guarantee any provider, so run the license check above for any contractor you call. See who's featured in your ZIP.