A new AC in Castle Rock should be sized to your house at 6,224 feet, not copied from the old unit’s label. We run a load calculation, quote flat-rate, pull the Town of Castle Rock Building Division permit and handle the paperwork.
Licensed & insured • Family-owned since 2004 • Flat-rate pricing
✓ Upfront flat-rate pricing✓ Castle Rock permits handled✓ Carrier, Lennox & Trane✓ All major brands serviced
AC Installation
AC Installation for Castle Rock homes
A new AC in Castle Rock should be sized to your house at 6,224 feet, not copied from the old unit’s label. We run a load calculation, quote flat-rate, pull the Town of Castle Rock Building Division permit and handle the paperwork.
We are a family shop, not a franchise call center. The tech who shows up can explain what failed and why, and the quote does not change after you say yes.
See our main ac installation page for how we approach this work across the metro.
AC Installation in Castle Rock: what’s different here
Castle Rock sits near the Palmer Divide and averages 57.5 inches of snow a year. Unlike most of metro Denver, homes here usually get gas from Black Hills Energy and electricity from CORE, not Xcel.
Sizing for Castle Rock
Design conditions here are a 85.7°F July average high at 6,224 feet. We size from a Manual J load calculation because an oversized unit short-cycles and leaves the house clammy, and an undersized one runs all afternoon.
Refrigerant change
New systems now ship with A2L refrigerants (R-454B or R-32). EPA’s May 2026 rule dropped the install deadline for leftover R-410A stock, so both are legal; we explain the trade-off on parts and service life before you choose.
Permit
Contractors must register with the Town before doing any work, backed by an ICC-comparable license from a testing municipality; unregistered contractors cannot pull permits.
Hytek pricing
AC Installation: $3,800 – $10,000 installed. Flat-rate, approved before work starts. Free estimates on replacements.
Elevation & climate
6,224 ft. Avg January low 18°F, avg July high 85.7°F, design temp 3°F, about 57.5 in of snow a year.
Homes
71% of Castle Rock homes were built in 2000 or later (median year built 2007).
Utilities
Electric: CORE Electric Cooperative. Gas: Black Hills Energy.
Permits
Town of Castle Rock Building Division. Contractors must register with the Town before doing any work, backed by an ICC-comparable license from a testing municipality; unregistered contractors cannot pull permits.
Rebates and programs for Castle Rock homeowners (2026)
Black Hills Energy 2026 gas rebates: For Black Hills gas customers: $260 (90% AFUE), $350 (95%) or $375 (97%) on a new furnace, up to $30 on a tune-up every 3 years, up to $100 on a smart thermostat. Source
CORE Cool Credits: CORE Electric members with central AC or a heat pump earn bill credits for letting an eligible smart thermostat take part in summer demand events. Source
Power Ahead Colorado: $1,500 off a new ENERGY STAR cold-climate heat pump (ducted or ductless) in an existing home. Needs pre-approval through a Power Ahead-badged contractor before work starts; stacks with utility and state incentives. Source
Colorado heat pump tax credit: $1,000 for air-source systems in 2026, claimed by a registered contractor who must pass at least a third to you as an invoice discount.
How much does ac installation cost in Castle Rock?
Our published range is $3,800 – $10,000 installed. Every Hytek job is quoted flat-rate and approved before work begins, so the price you agree to is the price you pay. Replacements get free in-home estimates; see the full HVAC cost guide for the other services.
Do I need a permit for HVAC work in Castle Rock?
Repairs generally do not. Replacing or installing a furnace, AC, heat pump or water heater does. Permits for Castle Rock addresses go through Town of Castle Rock Building Division. Contractors must register with the Town before doing any work, backed by an ICC-comparable license from a testing municipality; unregistered contractors cannot pull permits. We pull the permit and schedule the inspection.
What HVAC rebates are available in Castle Rock in 2026?
For heat pumps: no Xcel electric rebate, because CORE Electric offers thermostat credits rather than a heat pump rebate; the $1,500 Power Ahead Colorado rebate (pre-approval required); Colorado’s $1,000 air-source heat pump credit, at least a third of which the installer must pass to you as a line-item discount. Black Hills gas customers get $260–$375 on a new 90%+ furnace. Xcel’s gas furnace rebates ended Jan. 1, 2026, and the federal 25C credit does not apply to 2026 installs.
Should I get a heat pump instead of a new AC in Castle Rock?
Often, yes. A heat pump costs more than a straight AC but also heats, and in Castle Rock it can qualify for no Xcel electric rebate, because CORE Electric offers thermostat credits rather than a heat pump rebate and the $1,500 Power Ahead Colorado rebate (pre-approval required). A plain central AC has no current Xcel rebate. We quote both side by side.
Who provides gas and electricity in Castle Rock?
Electric: CORE Electric Cooperative. Gas: Black Hills Energy. That matters because rebates, operating costs and who you call about a gas leak all depend on the utility.
Does Hytek serve my part of Castle Rock?
Yes. We serve all of Castle Rock (ZIP 80104, 80108, 80109), including The Meadows, Crystal Valley Ranch, Castlewood Ranch, Terrain, Plum Creek. Call (303) 627-3395 or request service online.
Local data: U.S. Census Bureau (2025 population estimates; ACS 2020–2024 housing age), NOAA 1991–2020 climate normals, and city, county and utility program pages, checked September 2026. Rebates change; we confirm eligibility on your address when we quote.
Castle Rock, CO
Need ac installation in Castle Rock?
Flat-rate pricing, approved before work starts. Family-owned in Centennial since 2004.
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New customers: get your furnace cleaned and checked for before the first cold snap. When it gets cold, everybody calls at once. Grab a spot now while the schedule is open.
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