Should Oak Forest switch to a heat pump?
Oak Forest is a place where a heat pump genuinely costs more to operate than the alternative. 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 $278 a year HIGHER than the furnace it replaces, so that premium is never recovered. That's Oak Forest's own climate and rates talking, not a hedge or a caveat.
Oak Forest's weather, in the numbers that matter
Degree days tell the story here: Oak Forest racks up 4971 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 864 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: -5.3°F here (record low -10.7°F), which works out to a seasonal COP of 2.57 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Oak Forest — below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station LANSING MUNICIPAL AP, 12.3 miles from Oak Forest — the closest one on record.
The month-to-month numbers for Oak Forest
Modelled on a typical 2000-square-foot house, the heat pump draws about 4,898 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,074 a year. Oak Forest's gas rate of 11.25 per Mcf, applied to the 52 Mcf a year the furnace burns, puts its running cost near $796 a year, against 19.06¢ 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 $7,671 behind.
If your home heats with electric baseboard instead of gas
Not every home in Oak Forest has gas service. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. About $1,539 a year comes back this way, enough that the 5.2-year payback clears the $8,000 premium comfortably within the equipment's life.
How Oak Forest compares nationally
Ranked against the other 3206 cities covered, Oak Forest comes in at 761 for heating severity — 1 would be the coldest place in the dataset — and 1488 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 26,813 people in Oak Forest
Oak Forest, Illinois is home to about 26,813 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 Oak Forest, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Where Oak Forest's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Oak Forest's 2.57 seasonal COP and payback figure. Oak Forest's -5.3°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.