Boston / Lexington
Lexington is about 13 miles from the Census center point for Boston in a straight line and covers 16.433 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).
Lexington has 34,295 residents (give or take 75) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US2501735215, checked 2026-10-19), about 2,087 people per square mile.
The quote form takes a ZIP code; for Lexington that is 02420, 02421 (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 12,477 occupied homes in Lexington, 48% heat with natural gas, 31% with heating oil, 14% with electricity and 6% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US2501735215, checked 2026-10-19).
Lexington has 13 points more oil heat than Middlesex County as a whole, where 18% of homes burn oil, and 4 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).
Gas leads in Lexington at 48%, but 37% of homes still burn delivered oil or propane, and those 4,616 or so homes are where a heat pump pays back fastest.
The median Lexington home was built in 1965 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US2501735215, checked 2026-10-19) and the median home has 7.5 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US2501735215, checked 2026-10-19).
Lexington has 12,754 housing units, 21% built before 1940 and 65% before 1980, with 23% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US2501735215, checked 2026-10-19).
Lexington has 11 points fewer pre-1940 homes than Middlesex County as a whole (32%) and 8 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).
Only 23% of Lexington homes are new enough to pass the whole-home rebate's weatherization check on age, and 21% date from before 1940, so most of the other 77% show it with a home energy assessment before the heat pump goes in.
74% of Lexington homes are single-family detached, 5% are in two- to four-unit buildings and 13% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US2501735215, checked 2026-10-19).
With 74% detached houses and 5% in small multi-family buildings, a Lexington quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 20% of Lexington homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US2501735215, checked 2026-10-19), the landlord signs the quote in many of them.
Lexington has 28 points more detached houses than Middlesex County overall (46%) and 12 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).
Eversource Energy lists Lexington 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 Lexington 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 Lexington is $238,444 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US2501735215, 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: 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 Lexington 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 whether the quote is whole-home or partial-home, because with 48% of Lexington 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 Lexington home has 7.5 rooms and was built around 1965, 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 Lexington. The public number is the number the contractor quotes from.
No local contractor is named on this door for Lexington yet. A request from this page goes to the first licensed shop that takes the door.