San Francisco / Sonoma
Sonoma has 10,670 residents (give or take 26) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US0672646, checked 2026-10-19), about 3,888 people per square mile.
Sonoma is about 50 miles from the Census center point for San Francisco in a straight line and covers 2.744 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).
3,888 people per square mile puts Sonoma in suburban density, where the outdoor unit usually sits in a side yard and the noise is not an issue for neighbors.
Of the 5,285 occupied homes in Sonoma, 69% heat with natural gas, 0% with heating oil, 27% with electricity and 2% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US0672646, checked 2026-10-19).
Gas heats 69% of Sonoma against electricity at 27%, and a cold-climate heat pump sized for this market replaces the gas system outright, so the usual quote is a whole-home install.
Sonoma has about the Sonoma County oil share of 0% and 1 points more electric heat than the county's 26% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US06097, checked 2026-10-19).
Sonoma has 5,992 housing units, 6% built before 1940 and 57% before 1980, with 19% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US0672646, checked 2026-10-19).
Sonoma tracks Sonoma County on housing age, with the county at 8% pre-1940 and 17% post-2000 (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US06097, checked 2026-10-19).
The median Sonoma home was built in 1977 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US0672646, checked 2026-10-19) and the median home has 5 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US0672646, checked 2026-10-19).
58% of Sonoma homes are single-family detached, 11% are in two- to four-unit buildings and 11% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US0672646, checked 2026-10-19).
35% of Sonoma homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US0672646, 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.
Sonoma has 9 points fewer detached houses than Sonoma County overall (67%) (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US06097, checked 2026-10-19).
No electric utility is on file for Sonoma on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
LADWP Consumer Rebate Program heat pump HVAC, run by LADWP, is a live program for California addresses and publishes its terms without one headline figure (registry row 24 verified 2026-10-14, https://www.ladwp.com/residential-services/assistance-programs/consumer-rebate-program, checked 2026-10-16); confirm eligibility for the Sonoma address before counting it. With 27% of Sonoma homes already on electric heat and 71% on gas, oil or propane, the row that applies depends on the name on the electric bill and the fuel coming out.
Median household income in Sonoma is $98,527 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US0672646, 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: 26F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Sonoma County row, 99% heating, PDF pages 11 to 13 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 26F figure is the Sonoma County cold-day number a Sonoma heat pump is sized against, so ask the installer to show the system's heating output at 26F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 69% of Sonoma on gas and 27% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Sonoma home has 5 rooms and was built around 1977, 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 Sonoma. The public number is the number the contractor quotes from.
No local contractor is named on this door for Sonoma yet. A request from this page goes to the first licensed shop that takes the door.