Chicago / Herrin
Herrin has 12,226 residents (give or take 71) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US1734358, checked 2026-10-19), about 1,264 people per square mile.
Herrin is about 288 miles from the Census center point for Chicago in a straight line and covers 9.673 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 Herrin that is 62948 (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 5,559 occupied homes in Herrin, 45% heat with natural gas, 0% with heating oil, 54% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US1734358, checked 2026-10-19).
Electricity already heats 54% of Herrin homes, ahead of gas at 45%, and a home on electric baseboard sees the biggest bill change from a heat pump because it replaces resistance heat one for one.
Herrin has about the Williamson County oil share of 0% and 10 points less electric heat than the county's 64% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US17199, checked 2026-10-19).
Herrin has 6,183 housing units, 22% built before 1940 and 60% before 1980, with 28% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1734358, checked 2026-10-19).
Herrin has 7 points more pre-1940 homes than Williamson County as a whole (15%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US17199, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
The median Herrin home was built in 1969 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US1734358, checked 2026-10-19) and the median home has 5.7 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US1734358, checked 2026-10-19).
75% of Herrin homes are single-family detached, 15% are in two- to four-unit buildings and 3% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US1734358, checked 2026-10-19).
With 75% detached houses and 15% in small multi-family buildings, a Herrin quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 34% of Herrin homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US1734358, checked 2026-10-19), the landlord signs the quote in many of them.
60% of Herrin homes were built before 1980 and only 28% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1734358, 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 Herrin on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Ameren Illinois Instant Incentives (ducted ASHP), run by Ameren Illinois, is a live program for Illinois addresses and lists a standard figure of $900 (registry row 45 verified 2026-10-15, https://amerenillinoissavings.com/residential/ducted-air-source-heat-pump/, checked 2026-10-16); confirm eligibility for the Herrin address before counting it. With 54% of Herrin homes already on electric heat and 46% 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 Herrin is $59,975 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US1734358, 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: 7F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Williamson County row, 99% heating, PDF pages 29 to 33 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 7F figure is the Williamson County cold-day number a Herrin heat pump is sized against, so ask the installer to show the system's heating output at 7F, not at the milder rating-label temperature.
Ask for the heat-loss calculation room by room; the median Herrin home has 5.7 rooms and was built around 1969, 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 Herrin. The public number is the number the contractor quotes from.
No local contractor is named on this door for Herrin yet. A request from this page goes to the first licensed shop that takes the door.