Manchester / Grantham
Grantham has 3,465 residents (give or take 22) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=060XX00US3301931220, checked 2026-10-19), about 127 people per square mile.
Grantham is about 51 miles from the Census center point for Manchester in a straight line and covers 27.217 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 Grantham that is 03753 (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).
Grantham is spread out at 127 people per square mile across 27.217 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 1,431 occupied homes in Grantham, 0% heat with natural gas, 43% with heating oil, 0% with electricity and 49% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=060XX00US3301931220, checked 2026-10-19).
Propane leads in Grantham at 49%, ahead of oil at 43%, and a propane home is the clearest heat pump case on this door because delivered fuel is priced per gallon with no pipe to fall back on.
Grantham has 7 points less oil heat than Sullivan County as a whole, where 50% of homes burn oil, and 5 points less electric heat than the county's 5% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US33019, checked 2026-10-19).
Grantham has 2,336 housing units, 3% built before 1940 and 31% before 1980, with 24% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=060XX00US3301931220, checked 2026-10-19).
Grantham has 21 points fewer pre-1940 homes than Sullivan County as a whole (24%) and 10 points more homes built after 2000 than the county's 14% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US33019, checked 2026-10-19).
The median Grantham home was built in 1987 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=060XX00US3301931220, 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=060XX00US3301931220, checked 2026-10-19).
91% of Grantham homes are single-family detached, 0% are in two- to four-unit buildings and 5% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=060XX00US3301931220, checked 2026-10-19).
With 91% detached houses and 0% in small multi-family buildings, a Grantham quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 0% of Grantham homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US3301931220, checked 2026-10-19), the landlord signs the quote in many of them.
Grantham has 17 points more detached houses than Sullivan County overall (74%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US33019, checked 2026-10-19).
Only 0% of Grantham homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=060XX00US3301931220, 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.
Eversource lists Grantham among the New Hampshire communities it serves for electricity (New Hampshire Department of Energy, utilities by city and town, https://www.energy.nh.gov/utilities-providers/utilities-city-town, checked 2026-10-19).
NHSaves air source heat pump rebate, run by NHSaves (Eversource, Liberty, Unitil), is a live program for New Hampshire addresses and lists a standard figure of $250 (registry row 6 verified 2026-10-14, https://nhsaves.com/residential/electric-heating-cooling-equipment/, checked 2026-10-16); confirm eligibility for the Grantham address before counting it. With 0% of Grantham homes already on electric heat and 92% 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 Grantham is $106,403 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=060XX00US3301931220, 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: -4F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Sullivan County row, 99% heating, PDF page 81 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 -4F figure is the Sullivan County cold-day number a Grantham heat pump is sized against, so ask the installer to show the system's heating output at -4F, not at the milder rating-label temperature.
Ask for the heat-loss calculation room by room; the median Grantham home has 6.2 rooms and was built around 1987, 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 Grantham. The public number is the number the contractor quotes from.
No local contractor is named on this door for Grantham yet. A request from this page goes to the first licensed shop that takes the door.