Heat Pump Payback in Trenton, NJ
Should Trenton switch to a heat pump?
Here in Trenton, the honest answer is that a heat pump raises your annual running cost. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. Unfortunately the electric bill outweighs the gas bill it replaces by about $104 a year here, so the extra spend stays unrecovered. That's Trenton's own climate and rates talking, not a hedge or a caveat.
Checking a different city
This runs the same numbers for 3206 US cities, not just Trenton. Look one up here.
How cold Trenton actually gets
Trenton has a real but manageable winter, 4479 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 1128 cooling degree days. Sizing runs off the design temperature, not the average day: 12°F here (coldest 2024 reading 5°F), which works out to a seasonal COP of 2.99 for the cold-climate class of unit this climate calls for. Below the 25°F line where a standard machine starts leaning on resistance backup, Trenton sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station Trenton Mercer Airport, 4.6 miles from Trenton, the closest one on record.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,793 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,107 a year. That compares with roughly 47 Mcf a year of gas at Trenton's $14.21 per-Mcf rate, about $1,003 a year with the old AC included, against a local electricity rate of 23.28¢/kWh. Because the heat pump costs more to run here, the gap only widens with time: $7,056 behind after 15 years compared with replacing the furnace and AC like-for-like.
How sensitive Trenton's result is to prices
For the verdict in Trenton to flip, electricity would need to drop to about 20.1¢/kWh from 23.28¢, or gas climb past $16.43 per Mcf from $14.21. A utility offering a lower heat pump rate can change this. Until then, no quote price makes a heat pump pay back against gas in Trenton; the case for one here rests on comfort, cooling, or replacing electric heat instead.
Electric resistance heat in Trenton, compared
Gas isn't universal in Trenton, many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $1,874 a year, which recovers the extra $10,000 spent going electric in roughly 5.3 years.
Trenton against the rest of the country
Ranked against the other 3206 cities covered, Trenton comes in at 1214 for heating severity, 1 would be the coldest place in the dataset, and 385 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
Next step if you live in Trenton
Trenton, New Jersey is home to about 91,193 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system, this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. In Trenton, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
Where Trenton's figure comes from
The methodology guide walks through exactly how Trenton's 2.99 seasonal COP and the rest of this page's numbers get built. Trenton's 12°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.