Boston / Marshfield
Marshfield has 25,879 residents (give or take 28) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US2502338855, checked 2026-10-19), about 903 people per square mile.
Marshfield is about 22 miles from the Census center point for Boston in a straight line and covers 28.648 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 Marshfield that is 02050 (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 10,416 occupied homes in Marshfield, 61% heat with natural gas, 23% with heating oil, 14% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US2502338855, checked 2026-10-19).
Gas leads in Marshfield at 61%, but 24% of homes still burn delivered oil or propane, and those 2,500 or so homes are where a heat pump pays back fastest.
Marshfield has 9 points less oil heat than Plymouth County as a whole, where 32% of homes burn oil, and 2 points more electric heat than the county's 12% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US25023, checked 2026-10-19).
Marshfield has 11,813 housing units, 13% built before 1940 and 66% before 1980, with 14% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US2502338855, checked 2026-10-19).
Marshfield has 8 points fewer pre-1940 homes than Plymouth County as a whole (21%) and 4 points fewer homes built after 2000 than the county's 18% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US25023, checked 2026-10-19).
The median Marshfield home was built in 1968 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US2502338855, checked 2026-10-19) and the median home has 6.3 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US2502338855, checked 2026-10-19).
80% of Marshfield homes are single-family detached, 5% are in two- to four-unit buildings and 11% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US2502338855, checked 2026-10-19).
With 80% detached houses and 5% in small multi-family buildings, a Marshfield quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 19% of Marshfield homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US2502338855, checked 2026-10-19), the landlord signs the quote in many of them.
Marshfield has 10 points more detached houses than Plymouth County overall (70%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US25023, checked 2026-10-19).
Only 14% of Marshfield homes are new enough to pass the whole-home rebate's weatherization check on age, and 13% date from before 1940, so most of the other 86% show it with a home energy assessment before the heat pump goes in.
Eversource Energy lists Marshfield 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 Marshfield 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 Marshfield is $125,986 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US2502338855, 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), Plymouth 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 Plymouth County cold-day number a Marshfield 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 61% of Marshfield on gas and 14% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Marshfield home has 6.3 rooms and was built around 1968, 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 Marshfield. The public number is the number the contractor quotes from.
No local contractor is named on this door for Marshfield yet. A request from this page goes to the first licensed shop that takes the door.