St. Louis / Ladue
Ladue has 8,940 residents (give or take 25) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US2939656, checked 2026-10-19), about 1,044 people per square mile.
Ladue is about 8 miles from the Census center point for St. Louis in a straight line and covers 8.56 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).
The quote form takes a ZIP code; for Ladue that is 63124 (Census 2020 ZCTA to county subdivision and ZCTA to place relationship files, ZIP areas at least 20% inside the town, https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/tab20_zcta520_cousub20_natl.txt and https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/tab20_zcta520_place20_natl.txt, checked 2026-10-19).
Of the 3,428 occupied homes in Ladue, 87% heat with natural gas, 0% with heating oil, 11% with electricity and 0% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US2939656, checked 2026-10-19).
Gas heats 87% of Ladue against electricity at 11%, 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.
Ladue has about the St. Louis County oil share of 0% and 12 points less electric heat than the county's 23% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US29189, checked 2026-10-19).
Ladue has 3,557 housing units, 21% built before 1940 and 79% before 1980, with 13% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US2939656, checked 2026-10-19).
Ladue has 11 points more pre-1940 homes than St. Louis County as a whole (10%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US29189, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
The median Ladue home was built in 1955 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US2939656, checked 2026-10-19) and the median home has 10 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US2939656, checked 2026-10-19).
100% of Ladue homes are single-family detached, 0% are in two- to four-unit buildings and 0% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US2939656, checked 2026-10-19).
With 100% detached houses and 0% in small multi-family buildings, a Ladue quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 4% of Ladue homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US2939656, checked 2026-10-19), the landlord signs the quote in many of them.
Ladue has 28 points more detached houses than St. Louis County overall (72%) and 17 points fewer five-plus-unit buildings than the county's 17% (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US29189, checked 2026-10-19).
Only 4% of Ladue homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US2939656, checked 2026-10-19), so nearly every quote here is the resident talking to the installer directly, and the rebate goes to the person living in the house.
79% of Ladue homes were built before 1980 and only 13% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US2939656, 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.
No electric utility is on file for Ladue 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 Ladue is $250,001 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US2939656, 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: 2F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), St. Louis County row, 99% heating, PDF pages 68 to 73 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 2F figure is the St. Louis County cold-day number a Ladue heat pump is sized against, so ask the installer to show the system's heating output at 2F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 87% of Ladue on gas and 11% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Ladue home has 10 rooms and was built around 1955, 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 Ladue. The public number is the number the contractor quotes from.
No local contractor is named on this door for Ladue yet. A request from this page goes to the first licensed shop that takes the door.