Should Sunnyside switch to a heat pump?
Sunnyside sits right on the fence — how long you'll own the house decides this one. $3,500 is what Sunnyside would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. Lower bills claw that back: about $328 saved annually, for a payback of roughly 10.7 years. It's a genuine toss-up here — Sunnyside's numbers don't point clearly either way.
Sunnyside's weather, in the numbers that matter
Degree days tell the story here: Sunnyside racks up 5434 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 915 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 0°F here (record low -2°F), which works out to a seasonal COP of 2.7 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Sunnyside — 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, YAKIMA AIR TERMINAL/MCALSR FI, 31 miles from Sunnyside.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 5,096 kWh a year to keep it warm, plus cooling, for a combined electric bill near $839 a year. The gas furnace it replaces burns roughly 57 Mcf a year at 17.62 per Mcf here, for a running cost near $1,166 a year (electricity here runs 14.27¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 41.2 years, for a 15-year net position $1,418 ahead.
Electric resistance heat in Sunnyside, compared
Gas isn't universal in Sunnyside — many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. Switching saves about $1,294 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $8,000 spent up front comes back in about 6.2 years.
Sunnyside against the rest of the country
Sunnyside lands at position 415 out of 3206 cities on heating severity (coldest is 1), and 2264 out of 3206 by population size (biggest is 1). That's the coldest third of the dataset, where climate does most of the work behind this figure.
Next step for 16,317 people in Sunnyside
Sunnyside, Washington is home to about 16,317 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 Sunnyside, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Where Sunnyside's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Sunnyside's 2.7 seasonal COP and payback figure. Sunnyside's 0°F design temperature is below the 25°F line, which is why a cold-climate unit is the right call here — see what that changes in the cold-climate unit guide.