Baltimore / Gambrills
Gambrills has 2,830 residents (give or take 453) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US2431350, checked 2026-10-19), about 373 people per square mile.
Gambrills is about 14 miles from the Census center point for Baltimore in a straight line and covers 7.596 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 Gambrills that is 21108, 21144 (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 947 occupied homes in Gambrills, 24% heat with natural gas, 25% with heating oil, 46% with electricity and 4% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US2431350, checked 2026-10-19).
Electricity already heats 46% of Gambrills homes, ahead of oil at 25%, and a home on electric baseboard sees the biggest bill change from a heat pump because it replaces resistance heat one for one.
Gambrills has 17 points more oil heat than Anne Arundel County as a whole, where 8% of homes burn oil, and 4 points less electric heat than the county's 50% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US24003, checked 2026-10-19).
Gambrills has 978 housing units, 2% built before 1940 and 44% before 1980, with 41% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US2431350, checked 2026-10-19).
Gambrills has 3 points fewer pre-1940 homes than Anne Arundel County as a whole (5%) and 16 points more homes built after 2000 than the county's 25% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US24003, checked 2026-10-19).
The median Gambrills home was built in 1986 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US2431350, checked 2026-10-19) and the median home has 7.5 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US2431350, checked 2026-10-19).
92% of Gambrills homes are single-family detached, 1% are in two- to four-unit buildings and 0% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US2431350, checked 2026-10-19).
With 92% detached houses and 1% in small multi-family buildings, a Gambrills quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 8% of Gambrills homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US2431350, checked 2026-10-19), the landlord signs the quote in many of them.
Gambrills has 33 points more detached houses than Anne Arundel County overall (59%) and 16 points fewer five-plus-unit buildings than the county's 16% (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US24003, checked 2026-10-19).
Only 8% of Gambrills homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US2431350, 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.
41% of Gambrills housing was built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US2431350, 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.
No electric utility is on file for Gambrills 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 Gambrills is $148,594 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US2431350, 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: 17F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Anne Arundel 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 17F figure is the Anne Arundel County cold-day number a Gambrills heat pump is sized against, so ask the installer to show the system's heating output at 17F, not at the milder rating-label temperature.
Ask for the heat-loss calculation room by room; the median Gambrills home has 7.5 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 Gambrills. The public number is the number the contractor quotes from.
No local contractor is named on this door for Gambrills yet. A request from this page goes to the first licensed shop that takes the door.