Baltimore / White Marsh
White Marsh has 10,932 residents (give or take 877) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US2484350, checked 2026-10-19), about 2,059 people per square mile.
White Marsh is about 10 miles from the Census center point for Baltimore in a straight line and covers 5.31 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 White Marsh that is 21128 (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).
Of the 4,367 occupied homes in White Marsh, 38% heat with natural gas, 3% with heating oil, 58% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US2484350, checked 2026-10-19).
Electricity already heats 58% of White Marsh homes, ahead of gas at 38%, and a home on electric baseboard sees the biggest bill change from a heat pump because it replaces resistance heat one for one.
White Marsh has 4 points less oil heat than Baltimore County as a whole, where 7% of homes burn oil, and 20 points more electric heat than the county's 38% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US24005, checked 2026-10-19).
White Marsh has 4,539 housing units, 2% built before 1940 and 32% before 1980, with 29% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US2484350, checked 2026-10-19).
White Marsh has 5 points fewer pre-1940 homes than Baltimore County as a whole (7%) and 14 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=050XX00US24005, checked 2026-10-19).
The median White Marsh home was built in 1986 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US2484350, checked 2026-10-19) and the median home has 6.4 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US2484350, checked 2026-10-19).
52% of White Marsh homes are single-family detached, 0% are in two- to four-unit buildings and 25% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US2484350, checked 2026-10-19).
29% of White Marsh homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US2484350, checked 2026-10-19), so beside the 52% detached houses there is a real share of jobs where the landlord, not the resident, signs the quote.
White Marsh has 5 points more detached houses than Baltimore County overall (47%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US24005, checked 2026-10-19).
No electric utility is on file for White Marsh on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Median household income in White Marsh is $117,426 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US2484350, 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: 12F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Baltimore County row, 99% heating, PDF pages 55 to 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 12F figure is the Baltimore County cold-day number a White Marsh heat pump is sized against, so ask the installer to show the system's heating output at 12F, not at the milder rating-label temperature.
Ask for the heat-loss calculation room by room; the median White Marsh home has 6.4 rooms and was built around 1986, 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 White Marsh. The public number is the number the contractor quotes from.
No local contractor is named on this door for White Marsh yet. A request from this page goes to the first licensed shop that takes the door.