Portland / Thomaston
Thomaston has 2,769 residents (give or take 20) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US2301376365, checked 2026-10-19), about 253 people per square mile.
Thomaston is about 60 miles from the Census center point for Portland in a straight line and covers 10.93 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 Thomaston that is 04861 (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).
Thomaston is spread out at 253 people per square mile across 10.93 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 1,420 occupied homes in Thomaston, 0% heat with natural gas, 67% with heating oil, 9% with electricity and 11% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US2301376365, checked 2026-10-19).
Heating oil is the largest single fuel in Thomaston at 67%, ahead of propane at 11%, 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.
Thomaston has 11 points more oil heat than Knox County as a whole, where 56% of homes burn oil, and 2 points less electric heat than the county's 11% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US23013, checked 2026-10-19).
Thomaston has 1,500 housing units, 48% built before 1940 and 68% before 1980, with 11% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US2301376365, checked 2026-10-19).
Thomaston has 15 points more pre-1940 homes than Knox County as a whole (33%) and 7 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=050XX00US23013, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
The median Thomaston home was built in 1951 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US2301376365, checked 2026-10-19) and the median home has 6.2 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=060XX00US2301376365, checked 2026-10-19).
78% of Thomaston homes are single-family detached, 17% are in two- to four-unit buildings and 4% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US2301376365, checked 2026-10-19).
With 78% detached houses and 17% in small multi-family buildings, a Thomaston quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 26% of Thomaston homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US2301376365, checked 2026-10-19), the landlord signs the quote in many of them.
48% of Thomaston homes were built before 1940 and 68% before 1980 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US2301376365, checked 2026-10-19), so insulation is the first sizing question: an older home leaks more heat per square foot, and the installer runs a room-by-room heat-loss calculation to size the system for what the walls and windows actually hold in, not just the floor plan.
No electric utility is on file for Thomaston 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 Thomaston address before counting it. With 9% of Thomaston homes already on electric heat and 78% 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 Thomaston is $56,435 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US2301376365, 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), Knox 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 1F figure is the Knox County cold-day number a Thomaston 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 67% of the 1,420 occupied Thomaston homes have one and removal is usually a separate line on the quote.
Ask for the heat-loss calculation room by room; a Thomaston house from before 1940 (48% of the 1,500 units) rarely matches a square-footage rule of thumb.
The form on this page is the follow-up for Thomaston. The public number is the number the contractor quotes from.
No local contractor is named on this door for Thomaston yet. A request from this page goes to the first licensed shop that takes the door.