Hartford / Groton
Groton has 38,130 residents (give or take 86) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US0918034250, checked 2026-10-19), about 1,226 people per square mile.
Groton is about 44 miles from the Census center point for Hartford in a straight line and covers 31.11 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 Groton that is 06340, 06355 (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).
Median household income in Groton is $88,284 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US0918034250, 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.
48% of Groton homes are single-family detached, 15% are in two- to four-unit buildings and 24% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US0918034250, checked 2026-10-19).
47% of Groton homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US0918034250, checked 2026-10-19), so beside the 48% detached houses there is a real share of jobs where the landlord, not the resident, signs the quote.
Groton has 13 points fewer 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).
47% of Groton homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US0918034250, checked 2026-10-19), so the market splits between resident-led jobs where the occupant picks the system and landlord-led jobs where they do not, and the rebate paperwork differs.
Of the 16,374 occupied homes in Groton, 10% heat with natural gas, 46% with heating oil, 34% with electricity and 7% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US0918034250, checked 2026-10-19).
Heating oil is the largest single fuel in Groton at 46%, ahead of electricity at 34%, 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.
Groton has 3 points less oil heat than Southeastern Connecticut Planning Region as a whole, where 49% of homes burn oil, and 12 points more 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).
No electric utility is on file for Groton 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 Groton address before counting it. With 34% of Groton homes already on electric heat and 63% on gas, oil or propane, the row that applies depends on the name on the electric bill and the fuel coming out.
Groton has 18,155 housing units, 15% built before 1940 and 61% before 1980, with 14% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US0918034250, checked 2026-10-19).
Groton has 9 points fewer 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).
The median Groton home was built in 1974 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US0918034250, checked 2026-10-19) and the median home has 5.2 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US0918034250, checked 2026-10-19).
61% of Groton homes were built before 1980 and only 14% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US0918034250, 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.
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 Groton 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 46% of the 16,374 occupied Groton homes have one and removal is usually a separate line on the quote.
Ask for the heat-loss calculation room by room; the median Groton home has 5.2 rooms and was built around 1974, 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 Groton. The public number is the number the contractor quotes from.
No local contractor is named on this door for Groton yet. A request from this page goes to the first licensed shop that takes the door.