Heat Pump Payback in Monmouth, OR
Is a heat pump worth it in Monmouth?
Monmouth technically pencils out, but only past the point the equipment would need replacing anyway. $5,500 is what Monmouth would pay extra to go electric rather than replace the furnace and AC with the same again. Monmouth's residents would see roughly $243 a year back in running costs, putting the payback around 22.7 years. That's a technicality, not a recommendation, for anyone actually living in Monmouth.
Checking a different city
Monmouth is one of 3206 cities covered here, each run through the same model. Search another below.
Monmouth's weather, in the numbers that matter
Monmouth has a real but manageable winter, 3970 heating degree days a year against a 65°F base, and summers add a moderate cooling load, at 686 cooling degree days. The 99% winter design temperature here, the cold snap equipment must be sized for, not the seasonal average, is 16°F, and the coldest daily reading in the 2024 station record was 15.8°F. That puts the seasonal coefficient of performance at 3.08 for the recommended cold-climate unit. A cold-climate unit is the right call in Monmouth, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station McNary Field Airport, 11.7 miles from Monmouth, the closest one on record.
The yearly running costs in Monmouth
A 2000-square-foot house here would pull roughly 3,264 heating kilowatt-hours annually on top of cooling, totalling about $583 a year on electricity. The gas furnace it replaces burns roughly 41 Mcf a year at $16.71 per Mcf here, for a running cost near $825 a year including the old AC (electricity here runs 15.14¢/kWh). Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $1,858 behind.
What would change Monmouth's answer
Gas would only overtake the heat pump in Monmouth if electricity rose past 23.3¢/kWh from 15.14¢, or gas fell under $10.84 per Mcf from $16.71. A useful quote test for Monmouth: the heat pump is worth it within a decade if it costs less than $2,430 more than replacing the furnace and AC, and within 7 years if the gap is under $1,701.
If your home heats with electric baseboard instead of gas
Not every home in Monmouth has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $1,074 a year, which recovers the extra $10,000 spent going electric in roughly 9.3 years.
How Monmouth compares nationally
Monmouth lands at position 1550 out of 3206 cities on heating severity (coldest is 1), and 2870 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
Next step if you live in Monmouth
Monmouth, Oregon is home to about 11,651 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 Monmouth, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
Reading further on this page's numbers
The methodology guide walks through exactly how Monmouth's 3.08 seasonal COP and the rest of this page's numbers get built. Monmouth's 16°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.