Heat Pump Payback in Flat Rock, MI
Should Flat Rock switch to a heat pump?
Here in Flat Rock, the honest answer is that a heat pump raises your annual running cost. $5,500 is what Flat Rock would pay extra to go electric rather than replace the furnace and AC with the same again. Unfortunately the electric bill outweighs the gas bill it replaces by about $304 a year here, so the extra spend stays unrecovered. There's no spin on that: Flat Rock's numbers say wait.
Checking a different city
This runs the same numbers for 3206 US cities, not just Flat Rock. Look one up here.
Why Flat Rock's climate drives this number
Degree days tell the story here: Flat Rock racks up 5067 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 786 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 3.6°F here (coldest 2024 reading -1.7°F), which works out to a seasonal COP of 2.79 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Flat Rock, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station Grosse Ile Municipal Airport, 5.6 miles from Flat Rock, the closest one on record.
Flat Rock's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 4,599 heating kilowatt-hours annually on top of cooling, totalling about $1,092 a year on electricity. Flat Rock's gas rate of $10.92 per Mcf, applied to the 53 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $787 a year, against 20.72¢ per kWh for electricity. 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 $10,066 behind.
How sensitive Flat Rock's result is to prices
The heat pump would become the cheaper option in Flat Rock if electricity fell to 13.6¢/kWh (from 20.72¢) or gas rose above $16.69 per Mcf (from $10.92). At today's prices a cheaper quote cannot rescue the gas comparison in Flat Rock, since there is no yearly saving to recover it from.
Electric resistance heat in Flat Rock, compared
Not every home in Flat Rock has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $1,778 a year, which recovers the extra $10,000 spent going electric in roughly 5.6 years.
How Flat Rock compares nationally
Among 3206 cities, Flat Rock's winter puts it at rank 619 for severity, while its size puts it at rank 3139 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.
Deciding what's next in Flat Rock, MI
About 10,249 people live in Flat Rock, Michigan, 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.
More on how this number was built
Every constant behind this page, the 2.79 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Flat Rock's 3.6°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.