Chicago / Quincy
Quincy has 39,109 residents (give or take 28) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US1762367, checked 2026-10-19), about 2,456 people per square mile.
Quincy is about 233 miles from the Census center point for Chicago in a straight line and covers 15.922 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 Quincy that is 62301 (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 17,620 occupied homes in Quincy, 64% heat with natural gas, 0% with heating oil, 34% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US1762367, checked 2026-10-19).
Gas heats 64% of Quincy against electricity at 34%, 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.
Quincy has about the Adams County oil share of 0% and 1 points more electric heat than the county's 33% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US17001, checked 2026-10-19).
Quincy has 19,139 housing units, 26% built before 1940 and 76% before 1980, with 11% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1762367, checked 2026-10-19).
Quincy has 3 points more pre-1940 homes than Adams County as a whole (23%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US17001, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
The median Quincy home was built in 1959 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US1762367, 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=160XX00US1762367, checked 2026-10-19).
70% of Quincy homes are single-family detached, 10% are in two- to four-unit buildings and 13% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US1762367, checked 2026-10-19).
With 70% detached houses and 10% in small multi-family buildings, a Quincy quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 36% of Quincy homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US1762367, checked 2026-10-19), the landlord signs the quote in many of them.
Quincy has 6 points fewer detached houses than Adams County overall (76%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US17001, checked 2026-10-19).
76% of Quincy homes were built before 1980 and only 11% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1762367, 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 Quincy 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 Quincy address before counting it. With 34% of Quincy homes already on electric heat and 65% 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 Quincy is $56,480 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US1762367, 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: 3F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Adams 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 3F figure is the Adams County cold-day number a Quincy heat pump is sized against, so ask the installer to show the system's heating output at 3F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 64% of Quincy on gas and 34% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Quincy home has 5.4 rooms and was built around 1959, 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 Quincy. The public number is the number the contractor quotes from.
No local contractor is named on this door for Quincy yet. A request from this page goes to the first licensed shop that takes the door.