Heat pump vs. gas furnace in Belgrade, MT

Here in Belgrade, the honest answer is that a heat pump raises your annual running cost. 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). The heat pump would cost about $400 more a year to run than the furnace it replaces — a premium with no payback. There's no spin on that: Belgrade's numbers say wait.

The climate behind Belgrade's payback figure

Degree days tell the story here: Belgrade racks up 7555 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 348 cooling degree days on the cooling side. -32.1°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of -45°F on file. Worked through the model, that's a seasonal COP of 2.3 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Belgrade — below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Climate figures trace to the nearest NOAA station, GALLATIN FIELD AIRPORT, 0.9 miles from Belgrade.

What it actually costs to run, year to year

Modelled on a typical 2000-square-foot house, the heat pump draws about 8,318 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,168 a year. The gas furnace it replaces burns roughly 79 Mcf a year at 8.99 per Mcf here, for a running cost near $769 a year (electricity here runs 13.56¢/kWh). Buy it outright, not incrementally, and payback stretches to beyond the 15-year equipment life; over 15 years the net position sits $9,494 behind.

Electric resistance heat in Belgrade, compared

Plenty of homes in Belgrade heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Belgrade's answer improves. The saving here runs about $1,487 a year, which recovers the extra $8,000 spent going electric in roughly 5.4 years.

Belgrade against the rest of the country

Belgrade lands at position 25 out of 3206 cities on heating severity (coldest is 1), and 2686 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 12,741 people in Belgrade

About 12,741 people live in Belgrade, Montana, 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.

Line up a few local HVAC quotes before you decide.

Reading further on this page's numbers

Nothing above is a black box: the methodology guide shows the full arithmetic behind Belgrade's 2.3 seasonal COP and payback figure. At a -32.1°F design temperature, Belgrade sits in cold-climate territory; the guide to that class of unit explains why.