Is a heat pump worth it in Marlborough?

Marlborough technically pencils out, but only past the point the equipment would need replacing anyway. $3,500 is what Marlborough 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 $101 saved annually, for a payback of roughly 34.5 years. That's a technicality, not a recommendation, for anyone actually living in Marlborough.

How cold Marlborough actually gets

Marlborough has a cold winter that leans hard on heating equipment — 5633 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 703 cooling degree days. 10°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 0°F on file. Worked through the model, that's a seasonal COP of 2.94 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Marlborough sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station LAURENCE G HANSCOM FLD APT, 15.6 miles from Marlborough — the closest one on record.

The month-to-month numbers for Marlborough

Electricity use for heating alone comes out to about 4,852 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,643 a year. The gas furnace it replaces burns roughly 59 Mcf a year at 25.06 per Mcf here, for a running cost near $1,745 a year (electricity here runs 30.15¢/kWh). Looked at as a full purchase rather than an incremental one, payback here is roughly 133.1 years, leaving the 15-year total $1,979 behind.

Electric resistance heat in Marlborough, compared

Not every home in Marlborough has gas service. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. Switching saves about $2,932 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 2.7 years.

Marlborough against the rest of the country

Among 3206 cities, Marlborough's winter puts it at rank 335 for severity, while its size puts it at rank 974 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 Marlborough

Marlborough, Massachusetts is home to about 42,169 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 Marlborough, nothing is lost by holding off until the current equipment genuinely fails.

Get quotes from local HVAC contractors before deciding.

More on how this number was built

The methodology guide walks through exactly how Marlborough's 2.94 seasonal COP and the rest of this page's numbers get built. At a 10°F design temperature, Marlborough sits in cold-climate territory; the guide to that class of unit explains why.