Charleston / Isle of Palms
Isle of Palms is about 13 miles from the Census center point for Charleston in a straight line and covers 4.436 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).
Isle of Palms has 4,362 residents (give or take 15) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US4536115, checked 2026-10-19), about 983 people per square mile.
The quote form takes a ZIP code; for Isle of Palms that is 29451 (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 2,043 occupied homes in Isle of Palms, 2% heat with natural gas, 0% with heating oil, 88% with electricity and 8% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US4536115, checked 2026-10-19).
Isle of Palms has about the Charleston County oil share of 0% and 12 points more electric heat than the county's 76% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US45019, checked 2026-10-19).
Electricity already heats 88% of Isle of Palms homes, ahead of propane at 8%, and a home on electric baseboard sees the biggest bill change from a heat pump because it replaces resistance heat one for one.
The median Isle of Palms home was built in 1986 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US4536115, checked 2026-10-19) and the median home has 6.1 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US4536115, checked 2026-10-19).
Isle of Palms has 4,588 housing units, 0% built before 1940 and 30% before 1980, with 19% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US4536115, checked 2026-10-19).
Isle of Palms has 5 points fewer pre-1940 homes than Charleston County as a whole (5%) and 20 points fewer homes built after 2000 than the county's 39% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US45019, checked 2026-10-19).
70% of Isle of Palms homes are single-family detached, 2% 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=160XX00US4536115, checked 2026-10-19).
With 70% detached houses and 2% in small multi-family buildings, a Isle of Palms quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 7% of Isle of Palms homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US4536115, checked 2026-10-19), the landlord signs the quote in many of them.
Isle of Palms has 12 points more detached houses than Charleston County overall (58%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US45019, checked 2026-10-19).
Only 7% of Isle of Palms homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US4536115, 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.
No electric utility is on file for Isle of Palms 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 Isle of Palms is $156,979 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US4536115, 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: 28F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Charleston County row, 99% heating, PDF pages 105 to 107 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 28F figure is the Charleston County cold-day number a Isle of Palms heat pump is sized against, so ask the installer to show the system's heating output at 28F, not at the milder rating-label temperature.
Ask for the heat-loss calculation room by room; the median Isle of Palms home has 6.1 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 Isle of Palms. The public number is the number the contractor quotes from.
No local contractor is named on this door for Isle of Palms yet. A request from this page goes to the first licensed shop that takes the door.