Wilmington / Millsboro
Millsboro has 7,424 residents (give or take 23) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US1047940, checked 2026-10-19), about 1,447 people per square mile.
Millsboro is about 80 miles from the Census center point for Wilmington in a straight line and covers 5.131 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).
Median household income in Millsboro is $78,707 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US1047940, 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.
32% of Millsboro homes are single-family detached, 3% are in two- to four-unit buildings and 21% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US1047940, checked 2026-10-19).
32% of Millsboro homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US1047940, checked 2026-10-19), so beside the 32% detached houses there is a real share of jobs where the landlord, not the resident, signs the quote.
Millsboro has 33 points fewer detached houses than Sussex County overall (65%) and 12 points more five-plus-unit buildings than the county's 9% (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US10005, checked 2026-10-19).
Of the 3,276 occupied homes in Millsboro, 35% heat with natural gas, 6% with heating oil, 53% with electricity and 4% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US1047940, checked 2026-10-19).
Electricity already heats 53% of Millsboro homes, ahead of gas at 35%, and a home on electric baseboard sees the biggest bill change from a heat pump because it replaces resistance heat one for one.
Millsboro has about the Sussex County oil share of 7% and the same 53% electric share (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US10005, checked 2026-10-19).
No electric utility is on file for Millsboro on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Millsboro has 3,554 housing units, 1% built before 1940 and 12% before 1980, with 74% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1047940, checked 2026-10-19).
Millsboro has 3 points fewer pre-1940 homes than Sussex County as a whole (4%) and 25 points more homes built after 2000 than the county's 49% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US10005, checked 2026-10-19).
The median Millsboro home was built in 2012 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US1047940, checked 2026-10-19) and the median home has 5.1 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US1047940, checked 2026-10-19).
74% of Millsboro housing was built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1047940, checked 2026-10-19), and homes that recent usually meet the insulation codes in place at the time, so a heat pump sized to the floor plan lands closer to the real load than it would in an older neighborhood.
Heating design temperature: 18F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Sussex County row, 99% heating, PDF page 17 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 18F figure is the Sussex County cold-day number a Millsboro heat pump is sized against, so ask the installer to show the system's heating output at 18F, not at the milder rating-label temperature.
Ask for the heat-loss calculation room by room; the median Millsboro home has 5.1 rooms and was built around 2012, 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 Millsboro. The public number is the number the contractor quotes from.
No local contractor is named on this door for Millsboro yet. A request from this page goes to the first licensed shop that takes the door.