Tahlequah, OK: the heat pump payback math
In Tahlequah, the extra upfront cost technically comes back, just not before the equipment wears out. $3,500 is what Tahlequah would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. Tahlequah's residents would see roughly $185 a year back in running costs, putting the payback around 18.9 years. Tahlequah's own numbers say this pencils out only in theory, not in practice.
The climate behind Tahlequah's payback figure
Degree days tell the story here: Tahlequah racks up 3213 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1844 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 1.4°F here (record low -4°F), which works out to a seasonal COP of 2.73 for the cold-climate class of unit this climate calls for. Below the 25°F line where a standard machine starts leaning on resistance backup, Tahlequah sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station TAHLEQUAH MUNICIPAL ARPT, 1.9 miles from Tahlequah — the closest one on record.
The month-to-month numbers for Tahlequah
A 2000-square-foot house here would pull roughly 2,980 heating kilowatt-hours annually on top of cooling, totalling about $596 a year on electricity. The gas furnace it replaces burns roughly 33 Mcf a year at 13.99 per Mcf here, for a running cost near $781 a year (electricity here runs 13.10¢/kWh). Buy it outright, not incrementally, and payback stretches to 73 years; over 15 years the net position sits $727 behind.
If your home heats with electric baseboard instead of gas
Not every home in Tahlequah has gas service. Swap the comparison to resistance heat instead of gas, and Tahlequah's answer improves. About $782 a year comes back this way, enough that the 10.2-year payback clears the $8,000 premium comfortably within the equipment's life.
Tahlequah against the rest of the country
Tahlequah lands at position 1846 out of 3206 cities on heating severity (coldest is 1), and 2163 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
Next step for 17,319 people in Tahlequah
About 17,319 people live in Tahlequah, Oklahoma, 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.
Ask a local HVAC contractor for a quote before committing either way.
Where Tahlequah's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Tahlequah's 2.73 seasonal COP and payback figure. Tahlequah's 1.4°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.