Hermiston, OR: the heat pump payback math
Hermiston sits right on the fence — how long you'll own the house decides this one. Against a like-for-like gas furnace and AC swap, going electric costs $3,500 more up front here (already netting out a $2,000 tax credit). Lower bills claw that back: about $240 saved annually, for a payback of roughly 14.6 years. It's a genuine toss-up here — Hermiston's numbers don't point clearly either way.
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 (record low -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 ARPT, 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 its running cost near $1,032 a year, against 15.14¢ per kWh for electricity. Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 56.3 years, for a 15-year net position $100 ahead.
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 $8,000 spent going electric in roughly 6.5 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 for 19,746 people 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.