Is a heat pump worth it in Bonney Lake?

This one's marginal in Bonney Lake: it only clears if you stay long enough. 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). That premium is recovered through $344 of lower running costs every year, landing the payback clock at roughly 10.2 years. Whether that's worth it in Bonney Lake depends on how many years you expect to own the place.

The climate behind Bonney Lake's payback figure

Bonney Lake has a real but manageable winter — 4867 heating degree days a year against a 65°F base — and summers rarely ask much of an air conditioner, at 227 cooling degree days. Sizing runs off the design temperature, not the average day: 17.6°F here (record low 12.2°F), which works out to a seasonal COP of 3.12 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Bonney Lake — below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station PIERCE COUNTY AIRPORT THUN FI, 8.8 miles from Bonney Lake — the closest one on record.

What it actually costs to run, year to year

Modelled on a typical 2000-square-foot house, the heat pump draws about 3,950 kWh a year to keep it warm, plus cooling, for a combined electric bill near $591 a year. That compares with roughly 51 Mcf a year of gas at Bonney Lake's 17.62 per-Mcf rate — about $935 a year — against a local electricity rate of 14.27¢/kWh. Looked at as a full purchase rather than an incremental one, payback here is roughly 39.3 years, leaving the 15-year total $1,657 ahead.

The other scenario: no gas furnace to begin with

Gas isn't universal in Bonney Lake — many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $1,209 a year comes back this way, enough that the 6.6-year payback clears the $8,000 premium comfortably within the equipment's life.

Bonney Lake against the rest of the country

Among 3206 cities, Bonney Lake's winter puts it at rank 885 for severity, while its size puts it at rank 1772 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.

What to do with this number in Bonney Lake

About 22,145 people live in Bonney Lake, Washington, and every number on this page is what a contractor would actually work from when quoting a system here — the point isn't to replace that quote, it's to tell you whether to bother asking for one. Here, there's no cost penalty to waiting until your current furnace or AC actually needs replacing.

Get quotes from local HVAC contractors before deciding.

Reading further on this page's numbers

Every constant behind this page — the 3.12 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. At a 17.6°F design temperature, Bonney Lake sits in cold-climate territory; the guide to that class of unit explains why.