Des Moines / Marshalltown
Marshalltown has 27,626 residents (give or take 28) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US1949755, checked 2026-10-19), about 1,439 people per square mile.
Marshalltown is about 48 miles from the Census center point for Des Moines in a straight line and covers 19.198 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 10,135 occupied homes in Marshalltown, 71% heat with natural gas, 0% with heating oil, 26% with electricity and 2% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US1949755, checked 2026-10-19).
Gas heats 71% of Marshalltown against electricity at 26%, 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.
Marshalltown has about the Marshall County oil share of 0% and 4 points more electric heat than the county's 22% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US19127, checked 2026-10-19).
Marshalltown has 11,046 housing units, 30% built before 1940 and 78% before 1980, with 10% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1949755, checked 2026-10-19).
Marshalltown tracks Marshall County on housing age, with the county at 31% pre-1940 and 11% post-2000 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US19127, checked 2026-10-19).
The median Marshalltown home was built in 1958 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US1949755, checked 2026-10-19) and the median home has 5.4 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US1949755, checked 2026-10-19).
73% of Marshalltown homes are single-family detached, 8% are in two- to four-unit buildings and 14% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US1949755, checked 2026-10-19).
With 73% detached houses and 8% in small multi-family buildings, a Marshalltown quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 31% of Marshalltown homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US1949755, checked 2026-10-19), the landlord signs the quote in many of them.
Marshalltown has 6 points fewer detached houses than Marshall County overall (79%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US19127, checked 2026-10-19).
30% of Marshalltown homes were built before 1940 and 78% before 1980 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1949755, checked 2026-10-19), so insulation is the first sizing question: an older home leaks more heat per square foot, and the installer runs a room-by-room heat-loss calculation to size the system for what the walls and windows actually hold in, not just the floor plan.
No electric utility is on file for Marshalltown on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
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 Marshalltown address before counting it. With 26% of Marshalltown homes already on electric heat and 73% 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 Marshalltown is $69,068 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US1949755, 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: -5F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Marshall 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 -5F figure is the Marshall County cold-day number a Marshalltown heat pump is sized against, so ask the installer to show the system's heating output at -5F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 71% of Marshalltown on gas and 26% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; a Marshalltown house from before 1940 (30% of the 11,046 units) rarely matches a square-footage rule of thumb.
The form on this page is the follow-up for Marshalltown. The public number is the number the contractor quotes from.
No local contractor is named on this door for Marshalltown yet. A request from this page goes to the first licensed shop that takes the door.