Arlington / Round Hill
Round Hill has 678 residents (give or take 155) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US5169168, checked 2026-10-19), about 1,847 people per square mile.
Round Hill is about 40 miles from the Census center point for Arlington in a straight line and covers 0.367 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 267 occupied homes in Round Hill, 1% heat with natural gas, 13% with heating oil, 64% with electricity and 18% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US5169168, checked 2026-10-19).
Electricity already heats 64% of Round Hill homes, ahead of propane at 18%, and a home on electric baseboard sees the biggest bill change from a heat pump because it replaces resistance heat one for one.
Round Hill has 11 points more oil heat than Loudoun County as a whole, where 2% of homes burn oil, and 33 points more electric heat than the county's 31% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US51107, checked 2026-10-19).
Round Hill has 275 housing units, 30% built before 1940 and 55% before 1980, with 17% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US5169168, checked 2026-10-19).
Round Hill has 28 points more pre-1940 homes than Loudoun County as a whole (2%) and 40 points fewer homes built after 2000 than the county's 57% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US51107, checked 2026-10-19). An older stock means more insulation upgrades before the heat pump goes in.
The median Round Hill home was built in 1966 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US5169168, 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=160XX00US5169168, checked 2026-10-19).
76% of Round Hill homes are single-family detached, 0% are in two- to four-unit buildings and 24% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US5169168, checked 2026-10-19).
With 76% detached houses and 0% in small multi-family buildings, a Round Hill quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 27% of Round Hill homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US5169168, checked 2026-10-19), the landlord signs the quote in many of them.
Round Hill has 25 points more detached houses than Loudoun County overall (51%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US51107, checked 2026-10-19).
30% of Round Hill homes were built before 1940 and 55% before 1980 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US5169168, 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 Round Hill 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 Round Hill is $127,266 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US5169168, 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), Loudoun County row, 99% heating, PDF pages 127 to 133 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 Loudoun County cold-day number a Round Hill 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; a Round Hill house from before 1940 (30% of the 275 units) rarely matches a square-footage rule of thumb.
The form on this page is the follow-up for Round Hill. The public number is the number the contractor quotes from.
No local contractor is named on this door for Round Hill yet. A request from this page goes to the first licensed shop that takes the door.