Des Moines / Denison
Denison has 8,260 residents (give or take 24) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US1919945, checked 2026-10-19), about 1,263 people per square mile.
Denison is about 95 miles from the Census center point for Des Moines in a straight line and covers 6.54 square miles of land (Census 2024 Gazetteer internal points and land area, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/, checked 2026-10-19).
Of the 3,091 occupied homes in Denison, 56% heat with natural gas, 0% with heating oil, 41% with electricity and 2% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US1919945, checked 2026-10-19).
Gas heats 56% of Denison against electricity at 41%, so most quotes here are a partial-home system that carries the shoulder seasons and the summer while the gas furnace handles the coldest nights, or a whole-home system when the house is ready for it.
Denison has about the Crawford County oil share of 2% and the same 41% electric share (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US19047, checked 2026-10-19).
Denison has 3,251 housing units, 17% built before 1940 and 68% before 1980, with 10% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1919945, checked 2026-10-19).
Denison has 14 points fewer pre-1940 homes than Crawford County as a whole (31%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US19047, checked 2026-10-19).
The median Denison home was built in 1974 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US1919945, checked 2026-10-19) and the median home has 5.5 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US1919945, checked 2026-10-19).
65% of Denison homes are single-family detached, 12% are in two- to four-unit buildings and 11% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US1919945, checked 2026-10-19).
29% of Denison homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US1919945, checked 2026-10-19), so beside the 65% detached houses there is a real share of jobs where the landlord, not the resident, signs the quote.
Denison has 13 points fewer detached houses than Crawford County overall (78%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US19047, checked 2026-10-19).
68% of Denison homes were built before 1980 and only 10% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1919945, checked 2026-10-19), so most of the stock predates modern insulation codes; the installer's heat-loss calculation, not a square-footage rule, decides the tonnage.
MidAmerican Energy lists Denison among the Iowa communities it serves for electricity (MidAmerican Energy community list, electric communities, https://www.midamericanenergy.com/territory-communitylist, checked 2026-10-19).
MidAmerican 2026 Instant Discount air source heat pump, run by MidAmerican Energy, is a live program for Iowa addresses and covers qualifying equipment at $1,200 per system (registry row 31 verified 2026-10-14, https://www.midamericanenergy.com/home-discounts-and-rebates, checked 2026-10-16); confirm eligibility for the Denison address before counting it. With 41% of Denison homes already on electric heat and 58% on gas, oil or propane, the row that applies depends on the name on the electric bill and the fuel coming out.
Median household income in Denison is $65,684 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US1919945, checked 2026-10-19); many state and utility heat pump rebate programs set higher incentive tiers for income-qualifying households, so the household income on the application, not the town median, decides which level applies.
Heating design temperature: -4F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Crawford County row, 99% heating, PDF pages 37 to 41 of 141 (Revised 11/11/2020), https://www.energystar.gov/sites/default/files/Design%20Temperature%20Limit%20Reference%20Guide%20(2019%20Ed)%20-%20ENERGY%20STAR%20Single-Family%20New%20Homes_Rev11.pdf, fetched 2026-10-19, 99%.
That -4F figure is the Crawford County cold-day number a Denison heat pump is sized against, so ask the installer to show the system's heating output at -4F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 56% of Denison on gas and 41% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Denison home has 5.5 rooms and was built around 1974, and the count of heads and the tonnage follow the rooms and the insulation, not the square footage.
The form on this page is the follow-up for Denison. The public number is the number the contractor quotes from.
No local contractor is named on this door for Denison yet. A request from this page goes to the first licensed shop that takes the door.