Nashville / Chattanooga
Chattanooga has 185,783 residents (give or take 121) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US4714000, checked 2026-10-19), about 1,305 people per square mile.
Chattanooga is about 115 miles from the Census center point for Nashville in a straight line and covers 142.352 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 Chattanooga that is 37343, 37351, 37402, 37403, 37404, 37405, 37406, 37407 and 9 more (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 79,084 occupied homes in Chattanooga, 25% heat with natural gas, 0% with heating oil, 73% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US4714000, checked 2026-10-19).
Electricity already heats 73% of Chattanooga homes, ahead of gas 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.
Chattanooga has about the Hamilton County oil share of 0% and 5 points more electric heat than the county's 68% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US47065, checked 2026-10-19).
Chattanooga has 87,970 housing units, 13% built before 1940 and 55% before 1980, with 27% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US4714000, checked 2026-10-19).
The median Chattanooga home was built in 1976 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US4714000, checked 2026-10-19) and the median home has 5.2 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US4714000, checked 2026-10-19).
58% of Chattanooga homes are single-family detached, 10% are in two- to four-unit buildings and 26% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US4714000, checked 2026-10-19).
48% of Chattanooga homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US4714000, checked 2026-10-19), so beside the 58% detached houses there is a real share of jobs where the landlord, not the resident, signs the quote.
No electric utility is on file for Chattanooga on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Heating design temperature: 18F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Hamilton County row, 99% heating, PDF pages 111 to 115 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 18F figure is the Hamilton County cold-day number a Chattanooga heat pump is sized against, so ask the installer to show the system's heating output at 18F, not at the milder rating-label temperature.
Ask for the heat-loss calculation room by room; the median Chattanooga home has 5.2 rooms and was built around 1976, 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 Chattanooga. The public number is the number the contractor quotes from.
No local contractor is named on this door for Chattanooga yet. A request from this page goes to the first licensed shop that takes the door.