Furnace Installation in Trenton, NJ
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Mercer County will get in touch.
Tell us about the job
It takes about a minute.
What a Trenton winter asks of a new furnace
Trenton homes need heat from October through April, seven months of the year. Winter nights average 26°F, so a new furnace has to hold a house warm through a long stretch of cold, not just take the edge off a few weeks.
Most homes here heat with gas, and any non-weatherized gas furnace built after November 2015 has to reach at least 80 percent AFUE by federal rule. Storms are part of the picture too. Mercer County has logged 14 winter storms and 112 damaging wind events over the past ten years, and across New Jersey 11% of households lost power for at least 24 hours in 2024. Most furnaces start back up on their own once the power is back, no reset needed.
- 7 months
- October through April, your furnace is on duty
- 26°F
- the average winter night it heats against
- 71%
- of homes here heat with gas, so most furnaces here burn gas
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $130 a year to run in Mercer County compared with a gas furnace.
Estimates for a typical Mercer County home, from EIA household energy data, New Jersey fuel prices and NOAA climate normals. Your home will differ.
New Jersey requires HVAC contractors to hold a state license.
The state tested this contractor before handing out that license, and the Board of Examiners keeps a record of who holds one. That license belongs to the contractor, not to this one furnace job, and because New Jersey holds this authority statewide, no town or city in Mercer County can layer on its own separate license requirement.
For the furnace going into your house, the license tells you the person doing the work was tested and is on record with the state. What it does not cover is the installation itself. That comes from the local building office, which requires a permit for a furnace replacement and sends someone out to inspect the work once it is done. With most homes in Mercer County heating with gas, that inspection is the point where someone checks the gas connection itself, since a bad one is what makes this job dangerous.
Sources: New Jersey Legislature · New Jersey Division of Consumer Affairs
- What size furnace does my house need?
- The right size depends on your square footage, your insulation, your windows, and your ceiling height, so there is no single number that fits every home. A furnace that is too big will short cycle. It heats the house in bursts and wears out its parts faster. One that is too small will run constantly and still struggle on a 26°F night. A contractor will do a load calculation on your actual house, not a guess based on square footage alone, and that is what should size the unit.
- How do I know it's time to replace my furnace?
- Age is the first thing to look at, alongside how the furnace has been running. If it cycles on and off more than it used to, heats rooms unevenly, or your gas bill keeps climbing without a reason, those point to a furnace on its way out. A repair at that stage is often just a delay before the next breakdown. Homes here run their furnace from October through April, seven months a year, so a failing unit has a long season ahead of it to fail in.
- Is a high-efficiency furnace worth it?
- It depends on how much you run your furnace and what you have now. Every non-weatherized gas furnace sold since November 2015 has to reach at least 80 percent AFUE, so even a baseline replacement today is more efficient than an older unit might be. A high-efficiency model goes beyond that minimum and wastes less gas as heat lost out the flue instead of into your house. With seven months of heating season and winter nights averaging 26°F here, that difference gets used a lot more than it would somewhere milder. Whether the higher upfront cost pays off depends on your current furnace, your gas rates, and how long you plan to stay in the house, so a contractor can walk through the numbers for your situation.