Heat Pump Payback in St. Paul, MN
Heat pump vs. gas furnace in St. Paul, MN
St. Paul is a place where a heat pump genuinely costs more to operate than the alternative. $5,500 is what St. Paul would pay extra to go electric rather than replace the furnace and AC with the same again. The heat pump would cost about $184 more a year to run than the furnace it replaces, a premium with no payback. There's no spin on that: St. Paul's numbers say wait.
Compare against another city
Landed on St. Paul by mistake, or want to compare it against somewhere else? Search the other 3206 cities below.
Why St. Paul's climate drives this number
Degree days tell the story here: St. Paul racks up 5994 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 749 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: -5.1°F here (coldest 2024 reading -8°F), which works out to a seasonal COP of 2.58 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in St. Paul, 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, St Paul Dwtwn Holman Fd AP, 2.6 miles from St. Paul.
St. Paul's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 5,883 heating kilowatt-hours annually on top of cooling, totalling about $1,022 a year on electricity. That compares with roughly 62 Mcf a year of gas at St. Paul's $10.98 per-Mcf rate, about $838 a year with the old AC included, against a local electricity rate of 15.67¢/kWh. With running costs higher every year, there is no payback at any purchase price; over 15 years, against a like-for-like replacement, a household here would end $8,265 behind.
What would change St. Paul's answer
The heat pump would become the cheaper option in St. Paul if electricity fell to 12.3¢/kWh (from 15.67¢) or gas rose above $13.93 per Mcf (from $10.98). At today's prices a cheaper quote cannot rescue the gas comparison in St. Paul, since there is no yearly saving to recover it from.
The other scenario: no gas furnace to begin with
Gas isn't universal in St. Paul, many houses run on electric heat already. Against electric-resistance heat, baseboard or an electric furnace, both 100% efficient but still just resistance, the case for switching gets stronger here. The saving here runs about $1,509 a year, which recovers the extra $10,000 spent going electric in roughly 6.6 years.
Where St. Paul ranks in this dataset
Ranked against the other 3206 cities covered, St. Paul comes in at 231 for heating severity, 1 would be the coldest place in the dataset, and 68 by population, where 1 is largest. That's the coldest third of the dataset, where climate does most of the work behind this figure.
Deciding what's next in St. Paul, MN
About 307,465 people live in St. Paul, Minnesota, 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.
Where St. Paul's figure comes from
Every constant behind this page, the 2.58 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. St. Paul's -5.1°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.