Arlington / South Riding
South Riding has 34,352 residents (give or take 1,973) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US5174100, checked 2026-10-19), about 5,019 people per square mile.
South Riding is about 22 miles from the Census center point for Arlington in a straight line and covers 6.845 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 South Riding that is 20152 (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).
Median household income in South Riding is $196,403 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US5174100, 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.
5,019 people per square mile puts South Riding in suburban density, where the outdoor unit usually sits in a side yard and the noise is not an issue for neighbors.
49% of South Riding homes are single-family detached, 1% are in two- to four-unit buildings and 4% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US5174100, checked 2026-10-19).
17% of South Riding homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US5174100, checked 2026-10-19), so beside the 49% detached houses there is a real share of jobs where the landlord, not the resident, signs the quote.
South Riding has 11 points fewer five-plus-unit buildings than the county's 15% (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US51107, checked 2026-10-19).
Of the 10,371 occupied homes in South Riding, 81% heat with natural gas, 1% with heating oil, 15% with electricity and 2% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US5174100, checked 2026-10-19).
Gas heats 81% of South Riding against electricity at 15%, so most quotes here are a partial-home system that carries the shoulder seasons and the summer while the gas furnace handles the coldest nights, or a whole-home system when the house is ready for it.
South Riding has about the Loudoun County oil share of 2% and 16 points less 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).
No electric utility is on file for South Riding on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
South Riding has 10,510 housing units, 0% built before 1940 and 2% before 1980, with 77% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US5174100, checked 2026-10-19).
South Riding has 20 points more 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).
The median South Riding home was built in 2006 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US5174100, checked 2026-10-19) and the median home has 7.2 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US5174100, checked 2026-10-19).
77% of South Riding housing was built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US5174100, 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: 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 South Riding 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 whether the quote is whole-home or partial-home, because with 81% of South Riding on gas and 15% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median South Riding home has 7.2 rooms and was built around 2006, 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 South Riding. The public number is the number the contractor quotes from.
No local contractor is named on this door for South Riding yet. A request from this page goes to the first licensed shop that takes the door.