Heat pump vs. gas furnace in Louisville, CO

Here in Louisville, 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 $157 a year here, so the extra spend stays unrecovered. That's Louisville's own climate and rates talking, not a hedge or a caveat.

Louisville's weather, in the numbers that matter

Degree days tell the story here: Louisville racks up 4908 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1015 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 -5.8°F, against a record low of -11.2°F. That puts the seasonal coefficient of performance at 2.56 for the recommended cold-climate unit. A cold-climate unit is the right call in Louisville — below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station ATCT ROCKY MOUNTAIN METRO, 5 miles from Louisville — the closest one on record.

What it actually costs to run, year to year

A 2000-square-foot house here would pull roughly 4,855 heating kilowatt-hours annually on top of cooling, totalling about $946 a year on electricity. Louisville's gas rate of 11.17 per Mcf, applied to the 51 Mcf a year the furnace burns, puts its running cost near $788 a year, against 16.53¢ per kWh for electricity. Looked at as a full purchase rather than an incremental one, payback here is longer than the 15-year equipment life, leaving the 15-year total $5,857 behind.

The other scenario: no gas furnace to begin with

Not every home in Louisville has gas service. Swap the comparison to resistance heat instead of gas, and Louisville's answer improves. Switching saves about $1,326 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 6 years.

Louisville against the rest of the country

Among 3206 cities, Louisville's winter puts it at rank 853 for severity, while its size puts it at rank 1857 for population — 1 in both cases being the extreme. That's the coldest third of the dataset, where climate does most of the work behind this figure.

Next step for 20,811 people in Louisville

Louisville, Colorado is home to about 20,811 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 Louisville, nothing is lost by holding off until the current equipment genuinely fails.

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

More on how this number was built

The methodology guide walks through exactly how Louisville's 2.56 seasonal COP and the rest of this page's numbers get built. Louisville's -5.8°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.