Heat Pump Payback in Kent, WA
Will a heat pump pay off in Kent, WA?
In Kent, the extra upfront cost technically comes back, just not before the equipment wears out. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. Kent's residents would see roughly $336 a year back in running costs, putting the payback around 16.4 years. That's a technicality, not a recommendation, for anyone actually living in Kent.
Compare against another city
This runs the same numbers for 3206 US cities, not just Kent. Look one up here.
Kent's weather, in the numbers that matter
4626 heating degree days pile up here every year, so Kent has a real but manageable winter; the cooling side runs to 260 cooling degree days, where summers rarely ask much of an air conditioner. 19°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 15.1°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.16 on the cold-climate unit fit for this climate. Kent needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. Source: NOAA station Seattle-Tacoma International, 6 miles from Kent, the closest one on record.
Kent's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 3,707 heating kilowatt-hours annually on top of cooling, totalling about $561 a year on electricity. That compares with roughly 48 Mcf a year of gas at Kent's $17.62 per-Mcf rate, about $897 a year with the old AC included, against a local electricity rate of 14.27¢/kWh. Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $454 behind.
What would change Kent's answer
Gas would only overtake the heat pump in Kent if electricity rose past 23.6¢/kWh from 14.27¢, or gas fell under $10.64 per Mcf from $17.62. A useful quote test for Kent: the heat pump is worth it within a decade if it costs less than $3,360 more than replacing the furnace and AC, and within 7 years if the gap is under $2,352.
If your home heats with electric baseboard instead of gas
Plenty of homes in Kent heat with electricity alone, no gas line involved. Against electric-resistance heat, baseboard or an electric furnace, both 100% efficient but still just resistance, the case for switching gets stronger here. Switching saves about $1,159 a year here, a heat pump moving heat rather than generating it needs far less electricity than resistance coils, so the extra $10,000 spent up front comes back in about 8.6 years.
Kent against the rest of the country
Ranked against the other 3206 cities covered, Kent comes in at 1061 for heating severity, 1 would be the coldest place in the dataset, and 213 by population, where 1 is largest. That's the coldest third of the dataset, where climate does most of the work behind this figure.
What to do with this number in Kent
Kent, Washington is home to about 136,588 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 Kent, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Kent's 3.16 seasonal COP and payback figure. Kent's 19°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.