How much does HVAC cost in Trenton?
By Our research team · Last verified · Methodology
Most Trenton homeowners pay $3,800–$8,500 to replace a central AC sized at 3 tons on ducts you already have. $5,850 is typical, and a single-zone 12,000 BTU mini-split is $2,400–$5,400.
How we get this data- Typical
- $5,850
- Low end
- $2,850
- High end
- $12,750
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Get my fair quote →The typical Trenton price is $5,850, 6% below the US typical of $6,200.
Trenton's price band
Trenton is pricier than 54% of the 195 US metros we price for HVAC work.
Most Trenton AC replacements land between $3,800 and $8,500, with $5,850 the typical price for a 3-ton system on existing ducts. Doing the furnace at the same time brings it to $6,250–$15,350, and a heat pump instead of an AC is $5,300–$12,000.
Heating drives system choice in Trenton: gas furnace + AC is the common setup, and electric options lean toward cold-climate or dual-fuel heat pumps. The federal floor for a new split AC here is 13.4 SEER2.
These are installed prices for Trenton, re-verified in November 2026. Removal and startup are normally included; the permit, a new line set and duct repairs often are not. Get them itemized.
Comparing cities, or after the US-wide picture? See the national guide: HVAC cost in the USA.
$3,800–$8,500 to replace a 3-ton central AC on existing ducts in Trenton, installed — $5,850 typical. A heat pump runs $5,300–$12,000, a gas furnace $2,700–$7,700, and AC + furnace together $6,250–$15,350. Verified November 2026. Get free Trenton quotes →
- 3-ton central AC on existing ducts: $3,800–$8,500 ($5,850 typical)
- Heat pump, 3-ton: $5,300–$12,000; gas furnace: $2,700–$7,700
- AC + furnace together: $6,250–$15,350
- Mini-split: $2,400–$5,400 for one 12,000 BTU zone, $7,700–$17,300 for four
- Downtown Trenton & Mill Hill runs 5–10% above the city average; Ewing & Lawrence: standard to 5% below
Prices verified November 2026 · Cross-referenced against 45+ American pricing sources · See methodology
Installed prices for the Trenton metro, re-verified November 2026. Equipment-heavy jobs move less with local labor costs than service calls do.
| Service | Low | Typical | High |
|---|---|---|---|
| Central AC replacement, 3-ton (existing ducts)installed | $3,800installed | $5,850 | $8,500 |
| Central AC + gas furnace, replaced togetherinstalled | $6,250installed | $9,400 | $15,350 |
| Heat pump replacement, 3-ton (existing ducts)installed | $5,300installed | $7,700 | $12,000 |
| Central heat pump, high-efficiency with zoning (3-ton)installed | $9,600installed | $13,950 | $20,150 |
| Gas furnace replacement (80–96% AFUE)installed | $2,700installed | $4,400 | $7,700 |
| Ductless mini-split, 1 zone, 9,000 BTUinstalled | $2,100installed | $3,150 | $4,600 |
| Ductless mini-split, 1 zone, 12,000 BTUinstalled | $2,400installed | $3,750 | $5,400 |
| Ductless mini-split, 1 zone, 18,000 BTUinstalled | $3,050installed | $4,800 | $6,900 |
| Ductless mini-split, 1 zone, 24,000 BTUinstalled | $3,650installed | $5,950 | $8,450 |
| Ductless mini-split, 1 zone, 30,000–36,000 BTUinstalled | $4,600installed | $7,500 | $11,050 |
| Multi-zone mini-split, 2 zonesinstalled | $4,300installed | $6,250 | $9,600 |
| Multi-zone mini-split, 4 zonesinstalled | $7,700installed | $11,550 | $17,300 |
| Like-for-like AC swap: same-size mini-split, existing line setinstalled | $2,200installed | $3,350 | $5,000 |
| Install only: homeowner-supplied mini-split, 1 zonelabor only | $470labor only | $1,050 | $1,900 |
| Evaporative (swamp) cooler, roof-mountedinstalled | $1,250installed | $2,200 | $3,450 |
| Ductwork replacement, whole houseinstalled | $2,400installed | $5,250 | $9,050 |
| AC compressor replacement (out of warranty)per repair | $1,250per repair | $2,000 | $2,900 |
| AC repair, major: refrigerant leak fix + rechargeper repair | $570per repair | $1,250 | $2,400 |
| AC repair, minor: capacitor, contactor or drain lineper repair | $140per repair | $280 | $570 |
| AC tune-upper visit | $70per visit | $100 | $190 |
| Whole-system HVAC tune-up (AC + furnace)per year | $140per year | $220 | $420 |
| Duct cleaning, whole houseper home | $280per home | $420 | $660 |
| Smart thermostat, installedinstalled | $190installed | $290 | $440 |
| Old AC or furnace removal and disposalper unit | $95per unit | $240 | $470 |
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Prices verified November 2026 · Cross-referenced against 45+ American pricing sources · See methodology
Figures are for the Trenton metro area in November 2026. Rural edges may add trip fees; Downtown Trenton & Mill Hill sits at the top of these ranges.
HVAC prices across Trenton
Same city, four kinds of job. Older buildings in Downtown Trenton & Mill Hill take longer, bigger homes in Hamilton, Princeton & Bordentown need bigger systems, and Ewing & Lawrence usually comes in at or under the city typical.
Downtown Trenton & Mill Hill
- Installed
- $4,000–$9,350 installed
- Typical job
- $5,550–$7,400 / 3-ton AC swap
Older homes and mid-rise buildings. A like-for-like condenser swap is routine, but rooftop units and long line runs push quotes toward the top of the range.
North & East Trenton
- Installed
- $3,900–$8,950 installed
- Typical job
- $5,350–$7,050 / 3-ton AC swap
Renovated older homes. Contractors here often find leaky ducts or a tired air handler or furnace, which is where a simple AC quote grows.
Ewing & Lawrence
- Installed
- $3,650–$8,350 installed
- Typical job
- $5,050–$6,600 / 3-ton AC swap
Student rentals and small houses. Smaller systems and simple swaps keep most quotes at or a little below the city typical.
Hamilton, Princeton & Bordentown
- Installed
- $3,800–$9,000 installed
- Typical job
- $5,250–$7,150 / 3-ton AC swap
Larger homes on easy lots. The ton count drives the price more than access, and two-system homes are common.
Real-world HVAC costs in Trenton
Here's what common HVAC jobs cost in Trenton in 2026, a 3-ton central AC replacement on existing ducts, installed.
Swap a 3-ton AC on good ducts
Same spot, same size, matched indoor coil, old unit hauled away. Most Trenton jobs land near $5,850; a 17+ SEER2 unit adds about $2,000.
Replace the AC and gas furnace together
The usual move when both are 15+ years old. One install, one warranty, a matched system. Typical is $9,400.
Switch from AC + furnace to a heat pump
A 3-ton heat pump on existing ducts, typically $7,700. Keeping the furnace as backup (dual-fuel) runs $6,800–$16,350.
Cool one room with a mini-split
A 12,000 BTU single-zone mini-split for a bedroom, office or addition, typically $3,750. A 9,000 BTU unit for a small room is $2,100–$4,600.
Cool a whole home with no ducts
A 4-zone ductless system, typically $11,550. Adding ducts for central AC instead costs $2,400–$9,050 before the equipment.
How much does HVAC cost in Trenton?
Between $3,800 and $8,500 for a 3-ton central AC on existing ducts, and most Trenton homeowners pay close to $5,850. Size, efficiency and access set the number: a basic 13.4 SEER2 swap in an easy spot sits at the bottom, and a 20+ SEER2 variable-speed system with an attic air handler sits at the top.
Heating changes the math. A gas furnace alone runs $2,700–$7,700, a 3-ton heat pump $5,300–$12,000, and replacing the AC and furnace together $6,250–$15,350. For Trenton's climate, a gas furnace with central AC (or a cold-climate heat pump) is the usual fit.
Central AC, heat pump and furnace prices in Trenton (2026)
A 3-ton central AC runs $3,800–$8,500, a 3-ton heat pump $5,300–$12,000, and a gas furnace $2,700–$7,700, all installed.
| Line on the quote | Low | Typical | High |
|---|---|---|---|
| Central AC replacement, 3-ton (existing ducts) | $3,800 | $5,850 | $8,500 |
| Heat pump, 3-ton (existing ducts) | $5,300 | $7,700 | $12,000 |
| Gas furnace (80–96% AFUE) | $2,700 | $4,400 | $7,700 |
| Central AC + gas furnace together | $6,250 | $9,400 | $15,350 |
| Mini-split, 1 zone, 12,000 BTU | $2,400 | $3,750 | $5,400 |
| Mini-split, 2 zones | $4,300 | $6,250 | $9,600 |
| Mini-split, 4 zones | $7,700 | $11,550 | $17,300 |
| Ductwork replacement, whole house | $2,400 | $5,250 | $9,050 |
The gap between an AC and a heat pump in Trenton is about $1,850 at the typical price. That gap buys heating as well as cooling, so it matters most when the furnace is near the end of its life.
What moves an HVAC quote in Trenton:
- Size: a 2-ton system runs about $4,900 and a 5-ton about $8,200 at the typical price. Ask for a Manual J load calculation.
- Efficiency: the minimum here is 13.4 SEER2; a 17+ SEER2 two-stage unit adds about $2,000.
- Access: attic air handlers, rooftop condensers and tight closets add labor, most often in Downtown Trenton & Mill Hill.
- Line set and coil: a new line set runs $190–$620, and the indoor coil has to match the new refrigerant.
- Season: spring and fall bring the best prices; a breakdown during a summer heat wave brings the worst.
Ask every Trenton contractor for the same things: tonnage, SEER2 rating, model numbers for both the outdoor and indoor units, and whether the permit and line set are included. Compare those, not just the total. Get a quote for your heating and cooling work →
HVAC cost in Trenton by home size
About $5,300 for a 2.5-ton AC (1,000–1,600 sq ft), $5,850 for 3 tons (1,600–2,000 sq ft), and $7,200–$8,200 for 4–5 tons in homes over 2,500 sq ft, typical Trenton prices on existing ducts.
Worked example: a 2,000 sq ft Trenton home with a 16-year-old AC and furnace. Replacing both runs about $9,400; switching to a 3-ton heat pump on the same ducts runs about $7,700; replacing only the AC is $5,850 but leaves an old furnace in place.
Homes over 2,500 sq ft or with two floors often have two systems or zoning. A high-efficiency zoned heat pump runs $9,600–$20,150, and adding zoning to an existing system $1,650–$4,300.
Trenton HVAC costs by system type
| System type | Cost | Best for |
|---|---|---|
| Central AC, 3-ton (existing ducts) | $3,800–$8,500 installed | Homes with sound ducts and a furnace or air handler to pair with |
| Ductless mini-split, single zone (9,000–18,000 BTU) | $2,100–$6,900 installed | One room, an addition, or a home with no ducts |
| Multi-zone ductless mini-split (2–4 zones) | $4,300–$17,300 installed | Whole homes with no ducts, room-by-room control |
| Heat pump, 3-ton ducted (heats and cools) | $5,300–$12,000 installed | Mild and hot climates; replacing an AC and electric heat |
| Gas furnace + AC, replaced together | $6,250–$15,350 installed | Cold climates with natural gas and old equipment on both sides |
| Gas furnace only (80–96% AFUE) | $2,700–$7,700 installed | When the AC is newer than the furnace |
| Dual-fuel: heat pump + gas furnace | $6,800–$16,350 installed | Cold climates: electric heat most days, gas on the coldest |
| Cold-climate heat pump, 3-ton ducted | $9,100–$23,050 installed | Northern homes leaving gas, oil or propane |
| Central heat pump, high-efficiency with zoning | $9,600–$20,150 installed | Big or two-story homes with hot and cold rooms |
| Evaporative (swamp) cooler, roof-mounted | $1,250–$3,450 installed | Dry Western climates only |
| Geothermal heat pump (ground loop) | $14,400–$33,600 installed | Large lots and long stays in one home |
| Window or through-the-wall AC | $200–$1,150 installed | Single rooms and renters; cheapest way to cool |
Equipment vs installation: the Trenton AC bill
On a typical $5,850 3-ton swap in Trenton, the condenser and matched coil are roughly $2,350–$3,500 and the rest is labor, materials, the permit and overhead. Labor usually makes up 40–60% of an AC replacement.
Buying the unit yourself rarely saves much: many contractors won't install customer-supplied equipment, and the ones who do charge $470–$1,900 or more for a mini-split and won't cover the parts. Brand warranties often require a licensed installer.
What's included in a Trenton AC replacement (and what costs extra)
A standard replacement quote covers the outdoor unit, a matched indoor coil, refrigerant, connection to your existing ducts and wiring, removal of the old unit, and startup. Common extras:
- Permit and inspection: $95–$240, often built into the quote
- New refrigerant line set: $190–$620 if the old one can't be reused
- New condenser pad: $40–$240
- Electrical panel upgrade: $810–$3,800, mostly when adding a heat pump or more capacity
Ask for the AHRI certificate showing the matched rating of your outdoor and indoor units. It proves the system you paid for is the one that was installed.
Climate and what it means here
Heating drives system choice in Trenton: gas furnace + AC is the common setup, and electric options lean toward cold-climate or dual-fuel heat pumps. The federal floor for a new split AC here is 13.4 SEER2.
System size
Each ton adds equipment cost: about $4,900 for 2 tons and $7,200 for 4 tons at the typical Trenton price. A Manual J load calculation often shows a smaller system will do.
Efficiency rating
The federal minimum for a new split AC here is 13.4 SEER2. Higher ratings cost more upfront and pay back fastest where AC runs most of the year.
New refrigerants
New systems use A2L refrigerants (R-454B or R-32), so the indoor coil must match the outdoor unit. That's why condenser-only swaps are rare now, and why older R-410A systems cost more to service.
Ducts and access
Leaky or undersized ducts, attic air handlers and rooftop condensers add hours. Whole-house duct replacement runs $2,400–$9,050.
Location: Downtown Trenton & Mill Hill vs Ewing & Lawrence
Downtown Trenton & Mill Hill jobs cost more because of access, parking and older buildings. Ewing & Lawrence quotes usually sit at or a little under the city typical.
Season and urgency
Replacing on your schedule in spring or fall is cheaper than an emergency swap in a heat wave. After-hours repair labor runs $150–$240 an hour.
- Get three quotes for the same system.Same tonnage, same SEER2 rating, model numbers on every quote. Trenton quotes for the same 3-ton swap run anywhere from $3,800 to $8,500.
- Replace before it fails.If your system is 12–15+ years old, replace it in spring or fall. Emergency replacements in peak season leave no room to shop around.
- Right-size the system.Ask for a Manual J load calculation. An oversized AC costs more, cycles on and off, and leaves the house clammy.
- Check your utility for rebates.There is no federal tax credit for systems installed in 2026, but many utilities still pay rebates on efficient heat pumps and AC. Check before you sign; most require pre-approval or a listed contractor.
- Do the AC and furnace together if both are old.One install of both runs $6,250–$15,350, less than two separate jobs.
- Keep up with tune-ups.A yearly tune-up at $70–$190 catches weak capacitors and low refrigerant before they kill a compressor ($1,250–$2,900).
Before you pay a deposit to a Trenton HVAC contractor, get these in writing:
- Tonnage and how it was sized (a Manual J load calculation)
- Model numbers for the outdoor unit and the indoor coil or air handler
- The matched SEER2 (and HSPF2 for a heat pump) rating
- Whether the line set is new, flushed or reused
- Permit, inspection and removal of the old unit
- Thermostat, pad, disconnect and any electrical work
- Parts and labor warranty terms, and who registers the equipment
- Total price, deposit, and start and finish dates
How much does it cost to replace a central AC in Trenton?
$3,800–$8,500 for a 3-ton system on existing ducts, installed, with $5,850 typical in Trenton. Higher-efficiency units, attic or rooftop installs and new line sets push it up.
How much does a heat pump cost in Trenton?
$5,300–$12,000 for a 3-ton heat pump on existing ducts, about $7,700 typical. A high-efficiency zoned system runs $9,600–$20,150.
How much is a new furnace in Trenton?
$2,700–$7,700 for a gas furnace installed, about $4,400 typical. With a new AC at the same time, $6,250–$15,350.
How much does a mini-split cost in Trenton?
$2,400–$5,400 for a 12,000 BTU single zone, $4,300–$9,600 for two zones and $7,700–$17,300 for four.
How much is an AC tune-up in Trenton?
$70–$190 per visit. A yearly plan for AC and furnace runs $140–$420.
How much does AC repair cost in Trenton?
$140–$570 for common fixes like a capacitor or contactor. A refrigerant leak repair with recharge runs $570–$2,400, and a compressor $1,250–$2,900.
What size AC does a Trenton home need?
As a rough guide, 2.5 tons covers about 1,000–1,600 sq ft and 3 tons about 1,600–2,000 sq ft, but insulation, windows and climate change that. Ask for a Manual J load calculation instead of matching the old unit.
Is there a tax credit for a new AC or heat pump in Trenton?
No federal one for 2026: the 25C credit covered improvements made through December 31, 2025. Utility and state rebates may still apply, so check before you buy.
Do I need a permit to replace an AC in Trenton?
Usually, yes. Most US cities and counties require a mechanical permit for an AC or furnace replacement, typically $95–$240, and a licensed contractor normally pulls it.
How much does it cost to add ducts in Trenton?
$2,400–$9,050 for whole-house ductwork, before the AC or heat pump. In many older homes a multi-zone mini-split ($7,700–$17,300 for four zones) costs less.
Prices verified November 2026 · Cross-referenced against 45+ American pricing sources · See methodology
Prices for the Trenton metro area, November 2026. Outer suburbs may vary.
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