Heat pump vs. gas furnace in Wentzville, MO
In Wentzville, the extra upfront cost technically comes back, just not before the equipment wears out. 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). Wentzville's residents would see roughly $219 a year back in running costs, putting the payback around 16 years. That's a technicality, not a recommendation, for anyone actually living in Wentzville.
How cold Wentzville actually gets
Wentzville has a real but manageable winter — 3990 heating degree days a year against a 65°F base — and summers are hot enough that cooling matters as much as heating, at 1370 cooling degree days. 0°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of -8°F on file. Worked through the model, that's a seasonal COP of 2.7 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Wentzville — below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. These numbers come from SPIRIT OF ST LOUIS AIRPORT, the closest NOAA station, 16 miles out.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,742 kWh a year to keep it warm, plus cooling, for a combined electric bill near $630 a year. That compares with roughly 42 Mcf a year of gas at Wentzville's 14.94 per-Mcf rate — about $849 a year — against a local electricity rate of 12.83¢/kWh. Buy it outright, not incrementally, and payback stretches to 61.7 years; over 15 years the net position sits $220 behind.
Electric resistance heat in Wentzville, compared
Plenty of homes in Wentzville heat with electricity alone, no gas line involved. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $894 a year, which recovers the extra $8,000 spent going electric in roughly 8.9 years.
Where Wentzville ranks in this dataset
Among 3206 cities, Wentzville's winter puts it at rank 1514 for severity, while its size puts it at rank 845 for population — 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
Deciding what's next in Wentzville, MO
Wentzville, Missouri is home to about 48,646 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 Wentzville, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Wentzville's 2.7 seasonal COP and payback figure. Wentzville's 0°F design temperature is below the 25°F line, which is why a cold-climate unit is the right call here — see what that changes in the cold-climate unit guide.