Amesbury, MA: the heat pump payback math

The payback math works in Amesbury on paper, past the equipment's own working life. 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). Amesbury's residents would see roughly $109 a year back in running costs, putting the payback around 32.2 years. That's a technicality, not a recommendation, for anyone actually living in Amesbury.

How cold Amesbury actually gets

Amesbury has a cold winter that leans hard on heating equipment — 5514 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 759 cooling degree days. Sizing runs off the design temperature, not the average day: 10°F here (record low 3.9°F), which works out to a seasonal COP of 2.94 for the cold-climate class of unit this climate calls for. Amesbury needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. These numbers come from LAWRENCE MUNICIPAL AIRPORT, the closest NOAA station, 12.6 miles out.

Amesbury's running-cost comparison, in dollars

Electricity use for heating alone comes out to about 4,749 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,627 a year. The gas furnace it replaces burns roughly 57 Mcf a year at 25.06 per Mcf here, for a running cost near $1,736 a year (electricity here runs 30.15¢/kWh). Looked at as a full purchase rather than an incremental one, payback here is roughly 124.2 years, leaving the 15-year total $1,869 behind.

The other scenario: no gas furnace to begin with

Not every home in Amesbury has gas service. Swap the comparison to resistance heat instead of gas, and Amesbury's answer improves. The saving here runs about $2,879 a year, which recovers the extra $8,000 spent going electric in roughly 2.8 years.

Where Amesbury ranks in this dataset

Ranked against the other 3206 cities covered, Amesbury comes in at 369 for heating severity — 1 would be the coldest place in the dataset — and 2126 by population, where 1 is largest. That's the coldest third of the dataset, where climate does most of the work behind this figure.

Next step for 17,617 people in Amesbury

Amesbury, Massachusetts is home to about 17,617 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 Amesbury, nothing is lost by holding off until the current equipment genuinely fails.

Line up a few local HVAC quotes before you decide.

Where Amesbury's figure comes from

Every constant behind this page — the 2.94 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. At a 10°F design temperature, Amesbury sits in cold-climate territory; the guide to that class of unit explains why.