San Francisco / Larkspur
Larkspur has 12,854 residents (give or take 26) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US0640438, checked 2026-10-19), about 4,286 people per square mile.
Larkspur is about 31 miles from the Census center point for San Francisco in a straight line and covers 2.999 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 Larkspur that is 94939 (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 Larkspur is $140,417 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US0640438, 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.
4,286 people per square mile puts Larkspur in suburban density, where the outdoor unit usually sits in a side yard and the noise is not an issue for neighbors.
39% of Larkspur homes are single-family detached, 8% are in two- to four-unit buildings and 45% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US0640438, checked 2026-10-19).
With 45% of Larkspur homes in buildings of five or more units and 39% detached, the condo association usually decides where outdoor units can go, so that approval comes before the quote. With 53% of Larkspur homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US0640438, checked 2026-10-19), the landlord signs the quote in many of them.
Larkspur has 24 points fewer detached houses than Marin County overall (63%) and 26 points more five-plus-unit buildings than the county's 19% (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=050XX00US06041, checked 2026-10-19).
53% of Larkspur homes are rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US0640438, checked 2026-10-19), so the market splits between resident-led jobs where the occupant picks the system and landlord-led jobs where they do not, and the rebate paperwork differs.
Of the 6,018 occupied homes in Larkspur, 62% heat with natural gas, 0% with heating oil, 32% with electricity and 4% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US0640438, checked 2026-10-19).
Gas heats 62% of Larkspur against electricity at 32%, and a cold-climate heat pump sized for this market replaces the gas system outright, so the usual quote is a whole-home install.
Larkspur has about the Marin County oil share of 0% and 6 points more electric heat than the county's 26% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US06041, checked 2026-10-19).
No electric utility is on file for Larkspur 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 Larkspur address before counting it. With 32% of Larkspur homes already on electric heat and 66% on gas, oil or propane, the row that applies depends on the name on the electric bill and the fuel coming out.
Larkspur has 6,431 housing units, 10% built before 1940 and 73% before 1980, with 6% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US0640438, checked 2026-10-19).
Larkspur has 3 points fewer pre-1940 homes than Marin County as a whole (13%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US06041, checked 2026-10-19).
The median Larkspur home was built in 1970 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US0640438, checked 2026-10-19) and the median home has 4.8 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US0640438, checked 2026-10-19).
73% of Larkspur homes were built before 1980 and only 6% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US0640438, checked 2026-10-19), so most of the stock predates modern insulation codes; the installer's heat-loss calculation, not a square-footage rule, decides the tonnage.
Heating design temperature: 27F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Marin 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 27F figure is the Marin County cold-day number a Larkspur heat pump is sized against, so ask the installer to show the system's heating output at 27F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 62% of Larkspur on gas and 32% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Larkspur home has 4.8 rooms and was built around 1970, 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 Larkspur. The public number is the number the contractor quotes from.
No local contractor is named on this door for Larkspur yet. A request from this page goes to the first licensed shop that takes the door.