Heat Pump Payback in Sunnyside, WA
Should Sunnyside switch to a heat pump?
Sunnyside technically pencils out, but only past the point the equipment would need replacing anyway. $5,500 is what Sunnyside would pay extra to go electric rather than replace the furnace and AC with the same again. Lower bills claw that back: about $328 saved annually, for a payback of roughly 16.8 years. That's a technicality, not a recommendation, for anyone actually living in Sunnyside.
Compare against another city
This runs the same numbers for 3206 US cities, not just Sunnyside. Look one up here.
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 (coldest 2024 reading -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 including the old AC (electricity here runs 14.27¢/kWh). 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 $582 behind.
How sensitive Sunnyside's result is to prices
Gas would only overtake the heat pump in Sunnyside if electricity rose past 21.3¢/kWh from 14.27¢, or gas fell under $11.83 per Mcf from $17.62. A useful quote test for Sunnyside: the heat pump is worth it within a decade if it costs less than $3,280 more than replacing the furnace and AC, and within 7 years if the gap is under $2,296.
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 $10,000 spent up front comes back in about 7.7 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 if you live 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.