Boston / Wilmington
Wilmington is about 17 miles from the Census center point for Boston in a straight line and covers 16.973 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).
Wilmington has 23,336 residents (give or take 47) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US2501780230, checked 2026-10-19), about 1,375 people per square mile.
The quote form takes a ZIP code; for Wilmington that is 01887 (Census 2020 ZCTA to county subdivision relationship file, ZIP areas at least 20% inside the town, https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/tab20_zcta520_cousub20_natl.txt, checked 2026-10-19).
Of the 7,926 occupied homes in Wilmington, 32% heat with natural gas, 53% with heating oil, 5% with electricity and 8% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US2501780230, checked 2026-10-19).
Wilmington has 35 points more oil heat than Middlesex County as a whole, where 18% of homes burn oil, and 13 points less electric heat than the county's 18% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US25017, checked 2026-10-19).
Heating oil is the largest single fuel in Wilmington at 53%, ahead of gas at 32%, 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.
The median Wilmington home was built in 1979 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US2501780230, checked 2026-10-19) and the median home has 6.9 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US2501780230, checked 2026-10-19).
Wilmington has 8,077 housing units, 8% built before 1940 and 51% before 1980, with 20% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US2501780230, checked 2026-10-19).
Wilmington has 24 points fewer pre-1940 homes than Middlesex County as a whole (32%) and 5 points more homes built after 2000 than the county's 15% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US25017, checked 2026-10-19).
84% of Wilmington homes are single-family detached, 2% are in two- to four-unit buildings and 10% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US2501780230, checked 2026-10-19).
With 84% detached houses and 2% in small multi-family buildings, a Wilmington quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 12% of Wilmington homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US2501780230, checked 2026-10-19), the landlord signs the quote in many of them.
Wilmington has 38 points more detached houses than Middlesex County overall (46%) and 15 points fewer five-plus-unit buildings than the county's 25% (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US25017, checked 2026-10-19).
Only 12% of Wilmington homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US2501780230, checked 2026-10-19), so nearly every quote here is the resident talking to the installer directly, and the rebate goes to the person living in the house.
Wilmington is also on the state table of towns served by a municipal light plant, Reading Municipal Light Plant (Massachusetts municipally-owned electric companies, https://www.mass.gov/info-details/massachusetts-municipally-owned-electric-companies, checked 2026-10-19).
Mass Save heat pump rebates are for electric accounts with Cape Light Compact, Eversource, National Grid or Unitil, so a Wilmington home billed by Reading Municipal Light Plant asks the plant for its heat pump rebate instead.
Median household income in Wilmington is $168,152 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US2501780230, 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: 1F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Middlesex County row, 99% heating, PDF page 56 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 1F figure is the Middlesex County cold-day number a Wilmington heat pump is sized against, so ask the installer to show the system's heating output at 1F, not at the milder rating-label temperature.
Ask what happens to the oil tank, since 53% of the 7,926 occupied Wilmington homes have one and removal is usually a separate line on the quote.
Ask for the heat-loss calculation room by room; the median Wilmington home has 6.9 rooms and was built around 1979, 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 Wilmington. The public number is the number the contractor quotes from.
No local contractor is named on this door for Wilmington yet. A request from this page goes to the first licensed shop that takes the door.