Hempstead / Sag Harbor
Sag Harbor has 2,489 residents (give or take 525) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US3664485, checked 2026-10-19), about 1,393 people per square mile.
Sag Harbor is about 72 miles from the Census center point for Hempstead in a straight line and covers 1.787 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).
Of the 1,134 occupied homes in Sag Harbor, 32% heat with natural gas, 43% with heating oil, 11% with electricity and 4% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US3664485, checked 2026-10-19).
Heating oil is the largest single fuel in Sag Harbor at 43%, ahead of gas at 32%, 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.
Sag Harbor has about the Suffolk County oil share of 44% and 2 points more electric heat than the county's 9% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US36103, checked 2026-10-19).
Sag Harbor has 2,109 housing units, 39% built before 1940 and 67% before 1980, with 16% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US3664485, checked 2026-10-19).
Sag Harbor has 30 points more pre-1940 homes than Suffolk County as a whole (9%) and 3 points more homes built after 2000 than the county's 13% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US36103, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
The median Sag Harbor home was built in 1958 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US3664485, checked 2026-10-19) and the median home has 6.5 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US3664485, checked 2026-10-19).
88% of Sag Harbor homes are single-family detached, 4% are in two- to four-unit buildings and 3% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US3664485, checked 2026-10-19).
With 88% detached houses and 4% in small multi-family buildings, a Sag Harbor quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 17% of Sag Harbor homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US3664485, checked 2026-10-19), the landlord signs the quote in many of them.
Sag Harbor has 8 points more detached houses than Suffolk County overall (80%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US36103, checked 2026-10-19).
39% of Sag Harbor homes were built before 1940 and 67% before 1980 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US3664485, 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 Sag Harbor on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
NYS Clean Heat (Con Edison), run by Con Edison, is a live program for New York addresses and lists a standard figure of $7,000 (registry row 5 verified 2026-10-16, https://www.coned.com/en/save-money/rebates-incentives-tax-credits/rebates-incentives-tax-credits-for-residential-customers/electric-heating-and-cooling-technology-for-renters-homeowners/save-on-a-central-air-source-heat-pump, checked 2026-10-16); confirm eligibility for the Sag Harbor address before counting it. With 11% of Sag Harbor homes already on electric heat and 79% 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 Sag Harbor is $129,821 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US3664485, 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: 7F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Suffolk County row, 99% heating, PDF pages 84 to 86 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 7F figure is the Suffolk County cold-day number a Sag Harbor heat pump is sized against, so ask the installer to show the system's heating output at 7F, not at the milder rating-label temperature.
Ask what happens to the oil tank, since 43% of the 1,134 occupied Sag Harbor homes have one and removal is usually a separate line on the quote.
Ask for the heat-loss calculation room by room; a Sag Harbor house from before 1940 (39% of the 2,109 units) rarely matches a square-footage rule of thumb.
The form on this page is the follow-up for Sag Harbor. The public number is the number the contractor quotes from.
No local contractor is named on this door for Sag Harbor yet. A request from this page goes to the first licensed shop that takes the door.