Denver / Castle Rock
Castle Rock has 79,123 residents (give or take 51) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US0812415, checked 2026-10-19), about 2,277 people per square mile.
Castle Rock is about 27 miles from the Census center point for Denver in a straight line and covers 34.742 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 Castle Rock that is 80108, 80109 (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 28,219 occupied homes in Castle Rock, 76% heat with natural gas, 0% with heating oil, 22% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US0812415, checked 2026-10-19).
Gas heats 76% of Castle Rock against electricity at 22%, 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.
Castle Rock has about the Douglas County oil share of 0% and 1 points less electric heat than the county's 23% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US08035, checked 2026-10-19).
Castle Rock has 29,159 housing units, 0% built before 1940 and 7% before 1980, with 71% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US0812415, checked 2026-10-19).
Castle Rock has 15 points more homes built after 2000 than the county's 56% (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US08035, checked 2026-10-19).
The median Castle Rock home was built in 2007 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US0812415, checked 2026-10-19) and the median home has 7.1 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US0812415, checked 2026-10-19).
74% of Castle Rock homes are single-family detached, 1% are in two- to four-unit buildings and 17% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US0812415, checked 2026-10-19).
With 74% detached houses and 1% in small multi-family buildings, a Castle Rock quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 21% of Castle Rock homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US0812415, checked 2026-10-19), the landlord signs the quote in many of them.
71% of Castle Rock housing was built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US0812415, 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.
No electric utility is on file for Castle Rock on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Colorado Heat Pump Tax Credit (HPTC), run by Colorado Energy Office, is a live program for Colorado addresses and lists a standard figure of $1,000 (registry row 4 verified 2026-10-15, https://energyoffice.colorado.gov/hptc, checked 2026-10-16); confirm eligibility for the Castle Rock address before counting it. With 22% of Castle Rock homes already on electric heat and 77% 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 Castle Rock is $145,197 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US0812415, 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: 3F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Douglas County row, 99% heating, PDF pages 14 to 16 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 3F figure is the Douglas County cold-day number a Castle Rock heat pump is sized against, so ask the installer to show the system's heating output at 3F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 76% of Castle Rock on gas and 22% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median Castle Rock home has 7.1 rooms and was built around 2007, 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 Castle Rock. The public number is the number the contractor quotes from.
No local contractor is named on this door for Castle Rock yet. A request from this page goes to the first licensed shop that takes the door.