Boston / Dartmouth
Dartmouth has 33,328 residents (give or take 30) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US2500516425, checked 2026-10-19), about 547 people per square mile.
Dartmouth is about 53 miles from the Census center point for Boston in a straight line and covers 60.927 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 Dartmouth that is 02747, 02748 (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 12,200 occupied homes in Dartmouth, 51% heat with natural gas, 30% with heating oil, 8% with electricity and 5% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US2500516425, checked 2026-10-19).
Gas leads in Dartmouth at 51%, but 36% of homes still burn delivered oil or propane, and those 4,392 or so homes are where a heat pump pays back fastest.
Dartmouth has 7 points more oil heat than Bristol County as a whole, where 23% of homes burn oil, and 5 points less electric heat than the county's 13% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US25005, checked 2026-10-19).
Dartmouth has 12,944 housing units, 18% built before 1940 and 62% before 1980, with 17% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US2500516425, checked 2026-10-19).
Dartmouth has 14 points fewer pre-1940 homes than Bristol County as a whole (32%) and 5 points more homes built after 2000 than the county's 12% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US25005, checked 2026-10-19).
The median Dartmouth home was built in 1973 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US2500516425, 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=060XX00US2500516425, checked 2026-10-19).
76% of Dartmouth homes are single-family detached, 10% 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=060XX00US2500516425, checked 2026-10-19).
With 76% detached houses and 10% in small multi-family buildings, a Dartmouth quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 24% of Dartmouth homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US2500516425, checked 2026-10-19), the landlord signs the quote in many of them.
Dartmouth has 23 points more detached houses than Bristol County overall (53%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US25005, checked 2026-10-19).
Only 17% of Dartmouth homes are new enough to pass the whole-home rebate's weatherization check on age, and 18% date from before 1940, so most of the other 83% show it with a home energy assessment before the heat pump goes in.
Eversource Energy lists Dartmouth among the Massachusetts communities it serves for electricity (Eversource Energy communities we serve, https://www.eversource.com/residential/services/communities-we-serve, checked 2026-10-19).
For a Dartmouth address billed by Eversource Energy, the Mass Save whole-home heat pump rebate is $2,650 per ton up to $8,500, and the partial-home rebate is $1,125 per ton up to $8,500; for projects installed on or after January 1, 2027, the whole-home figure drops to $2,350 per ton capped at $7,500 (Mass Save air-source heat pump rebates, https://www.masssave.com/residential/rebates-offers-services/heating-and-cooling/heat-pumps/air-source-heat-pumps, checked 2026-10-19).
Median household income in Dartmouth is $99,839 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US2500516425, checked 2026-10-19); Mass Save's enhanced heat pump incentives are income-based and decided household by household, so the town median only hints at how many neighbors qualify.
Heating design temperature: 9F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Bristol 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 9F figure is the Bristol County cold-day number a Dartmouth heat pump is sized against, so ask the installer to show the system's heating output at 9F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 51% of Dartmouth on gas and 8% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Dartmouth home has 6 rooms and was built around 1973, 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 Dartmouth. The public number is the number the contractor quotes from.
No local contractor is named on this door for Dartmouth yet. A request from this page goes to the first licensed shop that takes the door.