Is a heat pump worth it in Portsmouth?

A heat pump earns back its extra cost in Portsmouth within a sensible timeframe. Against a like-for-like gas furnace and AC swap, going electric costs $1,000 more up front here (already netting out a $2,000 tax credit). Portsmouth's residents would see roughly $218 a year back in running costs, putting the payback around 4.6 years. The window here is reasonable, and it's specific to what Portsmouth actually pays for power and gas.

How cold Portsmouth actually gets

Degree days tell the story here: Portsmouth racks up 2541 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1741 cooling degree days on the cooling side. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 27.3°F, against a record low of 21.2°F. That puts the seasonal coefficient of performance at 3.01 for the recommended standard unit. Portsmouth's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. Source: NOAA station S CRANEY ISLAND, 2.1 miles from Portsmouth — the closest one on record.

The month-to-month numbers for Portsmouth

Electricity use for heating alone comes out to about 2,138 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $601 a year. That compares with roughly 26 Mcf a year of gas at Portsmouth's 16.79 per-Mcf rate — about $818 a year — against a local electricity rate of 16.58¢/kWh. Buy it outright, not incrementally, and payback stretches to 50.5 years; over 15 years the net position sits $2,268 ahead.

If your home heats with electric baseboard instead of gas

Gas isn't universal in Portsmouth — 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 $840 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $5,500 spent up front comes back in about 6.5 years.

Portsmouth against the rest of the country

Among 3206 cities, Portsmouth's winter puts it at rank 2138 for severity, while its size puts it at rank 356 for population — 1 in both cases being the extreme. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.

What to do with this number in Portsmouth

Portsmouth, Virginia is home to about 96,482 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. Given the math above, Portsmouth is a place worth lining up quotes ahead of a breakdown, not waiting for one.

Get quotes from local HVAC contractors before deciding.

Where Portsmouth's figure comes from

Every constant behind this page — the 3.01 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. The $2,000 federal credit baked into Portsmouth's number is explained, with the before-and-after math, in the tax credit guide.