Should Stamford switch to a heat pump?

Here in Stamford, the honest answer is that a heat pump raises your annual running cost. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $3,500 after a $2,000 federal tax credit. Unfortunately the electric bill outweighs the gas bill it replaces by about $221 a year here, so the extra spend stays unrecovered. There's no spin on that: Stamford's numbers say wait.

The climate behind Stamford's payback figure

Stamford has a real but manageable winter — 4760 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 888 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 15.1°F, against a record low of 6.1°F. That puts the seasonal coefficient of performance at 3.06 for the recommended cold-climate unit. Stamford 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. Climate figures trace to the nearest NOAA station, WESTCHESTER COUNTY AIRPORT, 8.4 miles from Stamford.

The month-to-month numbers for Stamford

Electricity use for heating alone comes out to about 3,939 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,398 a year. The gas furnace it replaces burns roughly 50 Mcf a year at 16.83 per Mcf here, for a running cost near $1,177 a year (electricity here runs 29.78¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs past the 15-year equipment life, for a 15-year net position $6,821 behind.

If your home heats with electric baseboard instead of gas

Gas isn't universal in Stamford — 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 $2,534 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 3.2 years.

How Stamford compares nationally

Stamford lands at position 977 out of 3206 cities on heating severity (coldest is 1), and 205 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 for 139,134 people in Stamford

About 139,134 people live in Stamford, Connecticut, 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.

Ask a local HVAC contractor for a quote before committing either way.

Reading further on this page's numbers

Every constant behind this page — the 3.06 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. Stamford's 15.1°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.