Heat pump vs. gas furnace in Mahomet, IL

Here in Mahomet, 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). Running costs here land $248 a year HIGHER than the furnace it replaces, so that premium is never recovered. That's Mahomet's own climate and rates talking, not a hedge or a caveat.

Mahomet's weather, in the numbers that matter

Degree days tell the story here: Mahomet racks up 4921 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 889 cooling degree days on the cooling side. -2.4°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of -10.3°F on file. Worked through the model, that's a seasonal COP of 2.64 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Mahomet sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station CHAMPAIGN 9 SW , 9.5 miles from Mahomet — the closest one on record.

Mahomet's running-cost comparison, in dollars

Electricity use for heating alone comes out to about 4,720 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,044 a year. The gas furnace it replaces burns roughly 51 Mcf a year at 11.25 per Mcf here, for a running cost near $796 a year (electricity here runs 19.06¢/kWh). 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 $7,219 behind.

The other scenario: no gas furnace to begin with

Plenty of homes in Mahomet heat with electricity alone, no gas line involved. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. Switching saves about $1,551 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 5.2 years.

Mahomet against the rest of the country

Among 3206 cities, Mahomet's winter puts it at rank 840 for severity, while its size puts it at rank 3061 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.

What to do with this number in Mahomet

Mahomet, Illinois is home to about 10,619 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 Mahomet, nothing is lost by holding off until the current equipment genuinely fails.

Line up a few local HVAC quotes before you decide.

Reading further on this page's numbers

Every constant behind this page — the 2.64 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. At a -2.4°F design temperature, Mahomet sits in cold-climate territory; the guide to that class of unit explains why.