Hartford / Guilford
Guilford has 22,108 residents (give or take 27) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US0917034950, checked 2026-10-19), about 470 people per square mile.
Guilford is about 30 miles from the Census center point for Hartford in a straight line and covers 47.079 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 Guilford that is 06437 (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).
Guilford is spread out at 470 people per square mile across 47.079 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 8,870 occupied homes in Guilford, 14% heat with natural gas, 57% with heating oil, 15% with electricity and 10% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US0917034950, checked 2026-10-19).
Heating oil is the largest single fuel in Guilford at 57%, 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.
Guilford has 27 points more oil heat than South Central Connecticut Planning Region as a whole, where 30% of homes burn oil, and 3 points less electric heat than the county's 18% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US09170, checked 2026-10-19).
Guilford has 9,839 housing units, 12% built before 1940 and 60% before 1980, with 10% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US0917034950, checked 2026-10-19).
Guilford has 11 points fewer pre-1940 homes than South Central Connecticut Planning Region as a whole (23%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US09170, checked 2026-10-19).
The median Guilford home was built in 1974 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US0917034950, checked 2026-10-19) and the median home has 6.6 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US0917034950, checked 2026-10-19).
84% of Guilford homes are single-family detached, 5% are in two- to four-unit buildings and 7% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US0917034950, checked 2026-10-19).
With 84% detached houses and 5% in small multi-family buildings, a Guilford quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 16% of Guilford homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US0917034950, checked 2026-10-19), the landlord signs the quote in many of them.
Guilford has 31 points more detached houses than South Central Connecticut Planning Region overall (53%) and 15 points fewer five-plus-unit buildings than the county's 22% (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US09170, checked 2026-10-19).
60% of Guilford homes were built before 1980 and only 10% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US0917034950, 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 Guilford 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 Guilford address before counting it. With 15% of Guilford homes already on electric heat and 81% 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 Guilford is $137,816 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US0917034950, 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), New Haven 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 Haven 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 2F figure is the New Haven County cold-day number a Guilford 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 what happens to the oil tank, since 57% of the 8,870 occupied Guilford homes have one and removal is usually a separate line on the quote.
Ask for the heat-loss calculation room by room; the median Guilford home has 6.6 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 Guilford. The public number is the number the contractor quotes from.
No local contractor is named on this door for Guilford yet. A request from this page goes to the first licensed shop that takes the door.