Hartford / Stonington
Stonington has 18,478 residents (give or take 24) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US0918073770, checked 2026-10-19), about 478 people per square mile.
Stonington is about 49 miles from the Census center point for Hartford in a straight line and covers 38.639 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 Stonington that is 06355, 06378, 06379 (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).
Stonington is spread out at 478 people per square mile across 38.639 square miles of land, so a long refrigerant line run between the outdoor unit and the farthest indoor head is the sizing question an installer checks first.
Of the 8,702 occupied homes in Stonington, 14% heat with natural gas, 56% with heating oil, 15% with electricity and 13% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US0918073770, checked 2026-10-19).
Heating oil is the largest single fuel in Stonington at 56%, ahead of electricity at 15%, so the usual job here is an oil boiler or furnace coming out and a cold-climate heat pump going in, with the oil tank removed.
Stonington has 7 points more oil heat than Southeastern Connecticut Planning Region as a whole, where 49% of homes burn oil, and 7 points less electric heat than the county's 22% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US09180, checked 2026-10-19).
Stonington has 9,900 housing units, 31% built before 1940 and 62% before 1980, with 16% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US0918073770, checked 2026-10-19).
Stonington has 7 points more pre-1940 homes than Southeastern Connecticut Planning Region as a whole (24%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US09180, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
The median Stonington home was built in 1968 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US0918073770, checked 2026-10-19) and the median home has 5.9 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US0918073770, checked 2026-10-19).
71% of Stonington homes are single-family detached, 14% are in two- to four-unit buildings and 8% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US0918073770, checked 2026-10-19).
With 71% detached houses and 14% in small multi-family buildings, a Stonington quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 27% of Stonington homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US0918073770, checked 2026-10-19), the landlord signs the quote in many of them.
Stonington has 10 points more detached houses than Southeastern Connecticut Planning Region overall (61%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US09180, checked 2026-10-19).
31% of Stonington homes were built before 1940 and 62% before 1980 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US0918073770, 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 Stonington on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Energize CT residential heat pump rebate, run by Energize CT, is a live program for Connecticut addresses and publishes its terms without one headline figure (registry row 3 verified 2026-10-15, https://www.energizect.com/node/68091, checked 2026-10-16); confirm eligibility for the Stonington address before counting it. With 15% of Stonington homes already on electric heat and 83% 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 Stonington is $114,797 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US0918073770, 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), New London County row, 99% heating, PDF page 17 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; town filed under New London County by Census Bureau, Connecticut county to county subdivision crosswalk (legacy county for each 2022 planning region town), https://www2.census.gov/geo/docs/reference/ct_change/ct_cou_to_cousub_crosswalk.txt, fetched 2026-10-19, 99%.
That 7F figure is the New London County cold-day number a Stonington 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 what happens to the oil tank, since 56% of the 8,702 occupied Stonington homes have one and removal is usually a separate line on the quote.
Ask for the heat-loss calculation room by room; a Stonington house from before 1940 (31% of the 9,900 units) rarely matches a square-footage rule of thumb.
The form on this page is the follow-up for Stonington. The public number is the number the contractor quotes from.
No local contractor is named on this door for Stonington yet. A request from this page goes to the first licensed shop that takes the door.