Should Vermillion switch to a heat pump?

In Vermillion, a heat pump would cost more to run each year than what you have now. $3,500 is what Vermillion 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. Running costs here land $230 a year HIGHER than the furnace it replaces, so that premium is never recovered. That's Vermillion's own climate and rates talking, not a hedge or a caveat.

Vermillion's weather, in the numbers that matter

Vermillion has a cold winter that leans hard on heating equipment — 6007 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 853 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is -13°F, against a record low of -18.9°F. That puts the seasonal coefficient of performance at 2.39 for the recommended cold-climate unit. Vermillion 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 CHAN GURNEY MUNICIPAL ARPT, the closest NOAA station, 23.2 miles out.

The month-to-month numbers for Vermillion

Modelled on a typical 2000-square-foot house, the heat pump draws about 6,364 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,003 a year. Vermillion's gas rate of 9.86 per Mcf, applied to the 63 Mcf a year the furnace burns, puts its running cost near $773 a year, against 14.15¢ per kWh for electricity. Buy it outright, not incrementally, and payback stretches to beyond the 15-year equipment life; over 15 years the net position sits $6,953 behind.

The other scenario: no gas furnace to begin with

Gas isn't universal in Vermillion — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Vermillion's answer improves. About $1,305 a year comes back this way, enough that the 6.1-year payback clears the $8,000 premium comfortably within the equipment's life.

Vermillion against the rest of the country

Ranked against the other 3206 cities covered, Vermillion comes in at 229 for heating severity — 1 would be the coldest place in the dataset — and 2828 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 11,877 people in Vermillion

Vermillion, South Dakota is home to about 11,877 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 Vermillion, nothing is lost by holding off until the current equipment genuinely fails.

Line up a few local HVAC quotes before you decide.

Where Vermillion's figure comes from

The methodology guide walks through exactly how Vermillion's 2.39 seasonal COP and the rest of this page's numbers get built. Vermillion's -13°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.