★★★★★ Rated 4.7 out of 5
4.7 Google rating from 432 reviews
HVAC Company in Castle Rock, CO
Furnace, AC and heat pump work in Castle Rock, $99.95 diagnostic posted.
- HVAC diagnostic: $99.95
- Price before any work starts
- Written guarantees
Heating and Cooling Service in Castle Rock
Summit Heating, A/C, Plumbing & Electrical repairs, installs and replaces furnaces, air conditioners, heat pumps, ductless mini-splits and boilers for homeowners in Castle Rock, across 80104, 80108 and 80109. It’s for households with a furnace or AC that’s failing, or a replacement to plan, who want the cause explained and the price shown first. Castle Rock’s residential furnace and AC permits may not need plan review, and we pull them through eTRAKiT.
HVAC diagnostic: $99.95. Your technician reviews the estimate with you. You can approve it on the spot or later through a link to the estimate.
HVAC diagnostic: $99.95. Your technician reviews the estimate with you. You can approve it on the spot or later through a link to the estimate.
Furnace, AC and Heat Pump Services for Castle Rock Homes
- Furnace repair in Castle Rock: gas furnaces that won’t light, short-cycle or blow cold air.
- AC repair in Castle Rock: central AC that won’t cool, short-cycles or leaks.
- Furnace installation and replacement: sizing, permit, install and startup.
- AC installation and replacement: new central air or replacing a worn-out unit.
- Heat pump installation: a heat pump in place of, or alongside, your furnace.
- Heat pump repair and maintenance: existing heat pumps that aren’t heating or cooling.
- Ductless mini-splits: installs and repairs for rooms the ducts don’t reach.
- Boiler repair and replacement: hot-water boilers.
- Humidifiers and indoor air quality: whole-home humidifiers for dry winter air, plus air quality equipment.
- Furnace tune-up: a heating check before the October 15 average first frost.
- AC tune-up: a cooling check in spring.
- Commercial HVAC replacement: replacement only.
How a Summit HVAC Service Visit Works
- Call (720) 870-1580 or request service online. Hours are Monday to Friday 7am to 6pm and Saturday and Sunday 8am to 3pm. After hours: our answering service takes your call and we call back the next business day.
- Your technician runs the HVAC diagnostic ($99.95) and shows you what failed.
- Repair comes first when repair is real. Existing R-410A systems can legally be repaired. EPA rules affect new equipment.
- Your technician reviews the estimate with you. Approve it on the spot or later from the link.
- If the work needs a permit, we pull it, then install, test and clean up.
Castle Rock eTRAKiT HVAC Permits and Codes
Castle Rock lists Residential AC and Residential Furnace among the permit types that may not need plan review, applied for through the town’s eTRAKiT portal. For applications from June 30, 2026, the town uses the 2024 International Mechanical Code and Fuel Gas Code with the 2021 IECC. (Town of Castle Rock, checked Nov 2026.)
Castle Rock registers mechanical contractors under Class M ($75 a year). Inspections can be scheduled in eTRAKiT until 6:30 a.m. on the day requested, or through the hotline by 3:30 p.m. for the next business day. Homes in unincorporated Douglas County with a Castle Rock address, such as Monte Vista Estates, are permitted by the county instead. We pull the permit either way.
Castle Rock registers mechanical contractors under Class M ($75 a year). Inspections can be scheduled in eTRAKiT until 6:30 a.m. on the day requested, or through the hotline by 3:30 p.m. for the next business day. Homes in unincorporated Douglas County with a Castle Rock address, such as Monte Vista Estates, are permitted by the county instead. We pull the permit either way.
SEER2 and Low-NOx Equipment Rules for a Castle Rock Replacement
- Efficiency minimums: Colorado is in the federal North region. Split ACs need at least 13.4 SEER2; split heat pumps need 14.3 SEER2 and 7.5 HSPF2.
- Low-NOx furnaces: New gas furnaces and water heaters sold in Colorado since Jan 1, 2026 must meet ultra-low-NOx limits (or be ENERGY STAR). Repairs to your current furnace aren’t affected.
- Refrigerant: Most new residential systems use R-454B or R-32, both A2L refrigerants.
- Altitude: Gas furnaces are set up to the manufacturer’s high-altitude instructions for the model.
Lennox, Mitsubishi and NATE Credentials on Our HVAC Team
Summit is a Mitsubishi Diamond Contractor and a Lennox Premier Dealer, holds the Lennox Centurion Award, and employs NATE-certified technicians. These cover our heating and cooling work.
“Christian was knowledgable, friendly, and offered great suggestions for ensuring our hvac system is running efficiently through winter.”
Emily, Google review
Our Google rating is 4.7 from 432 reviews, and reviewers mention furnace replacement 35 times.
“Christian was knowledgable, friendly, and offered great suggestions for ensuring our hvac system is running efficiently through winter.”
Emily, Google review
Our Google rating is 4.7 from 432 reviews, and reviewers mention furnace replacement 35 times.
HVAC Financing, Maintenance Memberships and Xcel Rebates
Financing is available through Service Finance Company, LLC, subject to credit approval. See terms when you apply. Ask about our maintenance memberships.
Xcel rebates may apply. We confirm current amounts with your quote. Xcel rebates apply to Xcel customers only; some addresses south and west of Denver are served by IREA. Xcel’s central AC rebates ended for invoices dated after Jan 1, 2024. Programs change without notice. Eligibility is confirmed at quote. Checked Nov 2026.
Xcel rebates may apply. We confirm current amounts with your quote. Xcel rebates apply to Xcel customers only; some addresses south and west of Denver are served by IREA. Xcel’s central AC rebates ended for invoices dated after Jan 1, 2024. Programs change without notice. Eligibility is confirmed at quote. Checked Nov 2026.
Our Written Guarantees on Every HVAC Job
Related Heating and Cooling Services Near Castle Rock
HVAC Services Related to Castle Rock Homes
HVAC Questions from Castle Rock Homeowners
Does a furnace or AC replacement in Castle Rock need plan review?
Usually not. Castle Rock lists Residential AC and Residential Furnace among the permit types that may not need plan review. We pull the permit through eTRAKiT.
Which energy code applies to an HVAC replacement in Castle Rock?
The 2021 IECC, alongside the 2024 mechanical and fuel gas codes, for applications from June 30, 2026 (checked Nov 2026).
Do Xcel rebates apply in Castle Rock?
Only if Xcel is your utility. Xcel rebates apply to Xcel customers only; some addresses south and west of Denver are served by IREA. We confirm current amounts with your quote.
What does furnace or AC repair cost in Castle Rock?
Repairs start with the HVAC diagnostic, which is $99.95. Your technician explains what failed and reviews the estimate with you. You can approve it on the spot or later through a link to the estimate.
Can my R-410A air conditioner still be repaired?
Yes. Existing R-410A systems can legally be repaired. EPA rules affect new equipment.
Are you open on weekends?
Yes. We’re open Saturday and Sunday 8am to 3pm and Monday to Friday 7am to 6pm. After hours: our answering service takes your call and we call back the next business day.
Schedule HVAC Service in Castle Rock
Mon-Fri 7am-6pm, Sat-Sun 8am-3pm. After hours: our answering service takes your call and we call back the next business day.