Portland / South Berwick
South Berwick has 7,670 residents (give or take 23) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US2303170030, checked 2026-10-19), about 239 people per square mile.
South Berwick is about 40 miles from the Census center point for Portland in a straight line and covers 32.134 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 South Berwick that is 03908 (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).
South Berwick is spread out at 239 people per square mile across 32.134 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 2,907 occupied homes in South Berwick, 7% heat with natural gas, 60% with heating oil, 4% with electricity and 20% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US2303170030, checked 2026-10-19).
Heating oil is the largest single fuel in South Berwick at 60%, ahead of propane at 20%, 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.
South Berwick has about the York County oil share of 60% and 6 points less electric heat than the county's 10% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US23031, checked 2026-10-19).
South Berwick has 3,172 housing units, 22% built before 1940 and 44% before 1980, with 18% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US2303170030, checked 2026-10-19).
South Berwick has 6 points fewer homes built after 2000 than the county's 24% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US23031, checked 2026-10-19).
The median South Berwick home was built in 1982 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US2303170030, checked 2026-10-19) and the median home has 6 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US2303170030, checked 2026-10-19).
77% of South Berwick homes are single-family detached, 10% are in two- to four-unit buildings and 9% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US2303170030, checked 2026-10-19).
With 77% detached houses and 10% in small multi-family buildings, a South Berwick quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 22% of South Berwick homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US2303170030, checked 2026-10-19), the landlord signs the quote in many of them.
South Berwick has 7 points more detached houses than York County overall (70%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US23031, checked 2026-10-19).
No electric utility is on file for South Berwick on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Efficiency Maine whole-home heat pump rebate, run by Efficiency Maine, is a live program for Maine addresses and lists a standard figure of $3,000 (registry row 7 verified 2026-10-15, https://www.efficiencymaine.com/whole-home-heat-pump-rebates/, checked 2026-10-16); confirm eligibility for the South Berwick address before counting it. With 4% of South Berwick homes already on electric heat and 87% 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 South Berwick is $99,572 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US2303170030, 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: 0F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), York County row, 99% heating, PDF pages 54 to 55 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 0F figure is the York County cold-day number a South Berwick heat pump is sized against, so ask the installer to show the system's heating output at 0F, not at the milder rating-label temperature.
Ask what happens to the oil tank, since 60% of the 2,907 occupied South Berwick homes have one and removal is usually a separate line on the quote.
Ask for the heat-loss calculation room by room; the median South Berwick home has 6 rooms and was built around 1982, 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 South Berwick. The public number is the number the contractor quotes from.
No local contractor is named on this door for South Berwick yet. A request from this page goes to the first licensed shop that takes the door.