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RESIDENTIAL HVAC · DOUGLAS COUNTY · 6,200 ft

Furnace and AC Service in Castle Rock, CO

Castle Rock is split by I-25, and so is the HVAC work. West of the interstate, The Meadows, Red Hawk and Sapphire Pointe are late-1990s and 2000s two-stories hitting their first replacements. East of it, Founders Village, Castlewood Ranch and Terrain run from early-2000s originals to homes still under builder warranty. Crystal Valley and Plum Creek fill in the south, and the historic Craig & Gould blocks downtown bring boilers, small closets and venting work.

60HVAC jobs completed in Castle Rock
1.4 hrsaverage response time
13systems installed this year
4five-star reviews from Castle Rock
CURRENT OFFERS IN CASTLE ROCK

Current coupons for Castle Rock homeowners.

All specials →
HVACExpires Oct 31, 2026$1,500 offA new HVAC system$1,500 off a new furnace, air conditioner or heat pump system, installed.CODE ANNIV1500Claim offerHVAC$8521-point furnace or AC tune-upA 21-point tune-up with a carbon monoxide test.CODE TUNEUP85Book a tune-upFINANCINGUp to 120 moPayments through WisetackProjects up to $25,000. Checking your rate takes a minute and doesn't affect your credit.NO CODE NEEDEDCheck my rate
QUICK FACTS

HVAC in Castle Rock at a glance.

At 6,200 feet a gas furnace delivers roughly 75% of its rated output, which is why so many Castle Rock homes we visit are undersized by installers from lower elevations. Winter design temperatures here run colder than Denver’s, so we specify cold-climate heat pumps and derate every furnace. Castle Rock is on Black Hills Energy for gas and CORE Electric Cooperative for power, so Xcel rebates do not apply; we file Black Hills and CORE rebates instead.

Updated October 2026 · prices and rebates are refreshed each quarter.
SERVICE AREA
Castle Rock, Douglas County
SERVICES
Furnace & AC replacement, repair, tune-ups, heat pumps, maintenance plan
NEW SYSTEM
$8,800 to $18,000 installed, from $96/mo
TUNE-UP
$85, 21-point with CO test
WARRANTY
10-year labor, 10-year parts on qualifying systems
INSTALL SPEED
Next-day available
UTILITY
Black Hills Energy gas · CORE Electric Cooperative electric
ELEVATION
6,200 ft · every system sized for altitude
PHONE
1-844-WEL-DONE · 24/7 dispatch
WHAT WE DO HERE

HVAC services in Castle Rock

Every job is dispatched from our Denver office with same-day appointments and no trip charge.
REPLACEMENTFurnace & AC replacement in Castle RockThree written options at a free in-home visit, next-day installs by our own crews. Every system sized for 6,200 ft.Replacement pricing →REPAIRFurnace repairSame-day repair, 4-hour no-heat response, 91% fixed on the first visit.Furnace repair →REPAIRAC repairAll brands, parts on the truck, flat price before work starts.AC repair →HEAT PUMPSCold-climate heat pumpsSized for 6,200 ft, with utility rebates handled.Heat pumps →MAINTENANCETune-ups & Essential Care Club$85 tune-up, or two a year with 15% off repairs from $12/mo.Plans →
WE KNOW CASTLE ROCK

Which Castle Rock neighborhoods do you serve?

All of Castle Rock, with most of our work in The Meadows, Founders Village, Castlewood Ranch, Crystal Valley, Plum Creek, Terrain, Red Hawk and Sapphire Pointe.

  • The Meadows12 jobs
  • Founders Village10 jobs
  • Castlewood Ranch7 jobs
  • Crystal Valley6 jobs
  • Plum Creek5 jobs
  • Terrain4 jobs
Don't see your neighborhood?We cover all of Castle Rock and the rest of Douglas County. No trip charge.Call 1-844-WEL-DONE
Furnace + AC replacementThe Meadows · March 2026
Cold-climate heat pumpFounders Village · January 2026
Two-system replacementCastlewood Ranch · September 2026
Tankless + furnaceCrystal Valley · May 2026
CASTLE ROCK HVAC QUESTIONS

Costs, rebates and timing in Castle Rock.

Colorado furnace cost guide →
MOST ASKED

How much does a new furnace cost in Castle Rock?

Furnace replacements in Castle Rock run $4,800 to $9,500 installed, and furnace-plus-AC systems $8,800 to $18,000. EMS sizes for 6,200 feet of elevation, prices in writing at a free in-home visit, and offers next-day installs.

The Meadows and Founders Village homes are mostly 1,800 to 2,800 square feet and fall in the middle of the range.

REBATES

Rebates in Castle Rock

Utility: Black Hills Energy gas · CORE Electric Cooperative electric.

Rebate amounts change each season and are confirmed on your estimate. We file the paperwork.

Financing options →
TIMING

Typical timing in Castle Rock

Free estimate
Within 48 hours, usually next day
Replacement install
Next day after approval, 1 day on site
Tune-up
Same week, 45 to 60 minutes
No-heat / no-cool call
On site within 4 hours
Book online →
QUESTION

Does altitude change which furnace I need in Castle Rock?

Yes. Gas furnaces lose about 4% of output per 1,000 feet, so at 6,200 feet a furnace delivers roughly 75% of its rated heat. We size and adjust for that; installers who skip it leave Castle Rock homes short on heat.

Heat pumps also need cold-climate models here because winter design temperatures are lower than in Denver.

QUESTION

Which rebates can Castle Rock homeowners get?

Castle Rock is served by Black Hills Energy for gas and CORE Electric Cooperative for electric, so Xcel rebates do not apply. Black Hills and CORE each run their own furnace, AC and heat pump rebates. We confirm current amounts on your estimate.

QUESTION

Do you offer same-day furnace repair in Castle Rock?

Yes. Castle Rock is in our daily Douglas County routes, same-day appointments are available, and no-heat calls get a technician on site within 4 hours.

ON EVERY SYSTEM WE INSTALL

Four guarantees, in writing, no fine print.

100% Satisfaction Guarantee

If for any reason you are not 100% satisfied with your new system or installation within the first 90 days, we correct the issue to your complete satisfaction. That’s it, no fine print.

Warranty Guarantee

Every system comes with the manufacturer’s standard warranty, and we add extended labor and parts coverage at no charge to you depending on the system you select. Peace of mind, 100% guaranteed.

Price Match + $100 Guarantee

Show us a written quote from any licensed contractor for a comparable system within 90 days of your installation, and we refund the difference plus $100.

90-Day Performance Guarantee

If the system does not heat or cool your home to the unit’s specifications within the first 90 days after installation, we repair or replace it at no charge to you.

Book Castle Rock furnace or AC service.

Same-day appointments available. 10-year labor, 10-year parts warranty on qualifying systems.

Essential Maintenance ServicesEssential Maintenance Services · Denver office1900 S Quince St Unit B, Denver, CO 802311-844-WEL-DONE · 24/7 dispatch · Office 7 AM to 7 PM

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