Heat Pump Payback in Hermiston, OR
Hermiston, OR: the heat pump payback math
Hermiston technically pencils out, but only past the point the equipment would need replacing anyway. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. Lower bills claw that back: about $240 saved annually, for a payback of roughly 22.9 years. That's a technicality, not a recommendation, for anyone actually living in Hermiston.
Checking a different city
This runs the same numbers for 3206 US cities, not just Hermiston. Look one up here.
Hermiston's weather, in the numbers that matter
Hermiston has a real but manageable winter, 4729 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 1065 cooling degree days. Sizing runs off the design temperature, not the average day: 3°F here (coldest 2024 reading -6°F), which works out to a seasonal COP of 2.77 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Hermiston, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Climate figures trace to the nearest NOAA station, Hermiston Municipal Airport, 1.2 miles from Hermiston.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 4,323 kWh a year to keep it warm, plus cooling, for a combined electric bill near $792 a year. Hermiston's gas rate of $16.71 per Mcf, applied to the 49 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $1,032 a year, against 15.14¢ per kWh for electricity. Priced as a standalone purchase, with a working furnace ripped out early, payback would take longer than the 15-year equipment life. Measured against the like-for-like replacement instead, a household here ends 15 years $1,900 behind.
What would change Hermiston's answer
Gas would only overtake the heat pump in Hermiston if electricity rose past 21.4¢/kWh from 15.14¢, or gas fell under $11.84 per Mcf from $16.71. A useful quote test for Hermiston: the heat pump is worth it within a decade if it costs less than $2,400 more than replacing the furnace and AC, and within 7 years if the gap is under $1,680.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Hermiston, many houses run on electric heat already. Against electric-resistance heat, baseboard or an electric furnace, both 100% efficient but still just resistance, the case for switching gets stronger here. The saving here runs about $1,230 a year, which recovers the extra $10,000 spent going electric in roughly 8.1 years.
Where Hermiston ranks in this dataset
Among 3206 cities, Hermiston's winter puts it at rank 1002 for severity, while its size puts it at rank 1949 for population, 1 in both cases being the extreme. That's the coldest third of the dataset, where climate does most of the work behind this figure.
Next step if you live in Hermiston
Hermiston, Oregon is home to about 19,746 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 Hermiston, 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 Hermiston's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Hermiston's 2.77 seasonal COP and payback figure. At a 3°F design temperature, Hermiston sits in cold-climate territory; the guide to that class of unit explains why.