Cincinnati / Mariemont
Mariemont is about 7 miles from the Census center point for Cincinnati in a straight line and covers 0.894 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).
Mariemont has 3,474 residents (give or take 29) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US3947600, checked 2026-10-19), about 3,886 people per square mile.
3,886 people per square mile puts Mariemont in suburban density, where the outdoor unit usually sits in a side yard and the noise is not an issue for neighbors.
Of the 1,366 occupied homes in Mariemont, 78% heat with natural gas, 1% with heating oil, 19% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US3947600, checked 2026-10-19).
Mariemont has about the Hamilton County oil share of 1% and 16 points less electric heat than the county's 35% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US39061, checked 2026-10-19).
Gas heats 78% of Mariemont against electricity at 19%, 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.
The median Mariemont home was built in 1945 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US3947600, checked 2026-10-19) and the median home has 6.5 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US3947600, checked 2026-10-19).
Mariemont has 1,477 housing units, 37% built before 1940 and 87% before 1980, with 12% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US3947600, checked 2026-10-19).
Mariemont has 12 points more pre-1940 homes than Hamilton County as a whole (25%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US39061, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
37% of Mariemont homes were built before 1940 and 87% before 1980 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US3947600, 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.
60% of Mariemont homes are single-family detached, 12% are in two- to four-unit buildings and 20% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US3947600, checked 2026-10-19).
25% of Mariemont homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US3947600, checked 2026-10-19), so beside the 60% detached houses there is a real share of jobs where the landlord, not the resident, signs the quote.
No electric utility is on file for Mariemont on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Median household income in Mariemont is $152,273 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US3947600, 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), Hamilton County row, 99% heating, PDF pages 94 to 97 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 Hamilton County cold-day number a Mariemont 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 78% of Mariemont on gas and 19% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; a Mariemont house from before 1940 (37% of the 1,477 units) rarely matches a square-footage rule of thumb.
The form on this page is the follow-up for Mariemont. The public number is the number the contractor quotes from.
No local contractor is named on this door for Mariemont yet. A request from this page goes to the first licensed shop that takes the door.