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Top-Rated Air conditioning pros in Castle Rock - Updated Nov 2026

Avatar for Lous Heating and Cooling LLC
Lous Heating and Cooling LLC
5.0(
71
)
Swamp Cooler - Service or RepairCentral A/C - Service or RepairCentral Air Cleaner - Install or Replace+2 more

Serving Castle Rock, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Emergency services offered

"The work done was exceptional. It was done in an efficient and timely matter. Louis showed expert knowledge and gave terrific customer service. He answered all my questions and helped me with my new air conditioning system. I would definitely recommend his work to anybody who is looking for a hard-working and knowledgeable HVAC provider! I could tell he really cared about the work and if ther is any other services I need, he will be my first call. Thank you again Louis"
80% Furnace Replacement
1998 York Furnace
Air Conditioner Replacement
Furnace Replacement
Swamp Cooler Deep Cleaning

+7

Response time4 hrs
82 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Air&Hvac Master
Air&Hvac Master
5.0(
14
)
Central A/C - InstallCentral A/C - Service or Repair

Serving Castle Rock, CO and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"They had a lot of experience in the cleaning up our air duct. They were the best. They also cleaned my dryer and chimney very well. I'm comfortable using them again and again. They had a reasonable price."
Clogged AC coil
After cleaning
Air Duct Cleaning Project
Air Duct Cleaning Project
Coil after cleaning

+26

Response time10 hrs
Response rate100%
2 neighbors recently requested a quote
Avatar for Quality West Heating & Cooling
Quality West Heating & Cooling
4.7(
338
)
Central A/C - InstallCentral A/C - Service or RepairDuctless Mini-split A/C - Install or Replace

Serving Castle Rock, CO and surrounding areas

Approved

In business since 2002

Free estimates

Warranties offered

"Don was excellent. He performed a very thorough inspection of my system and clearly explained all his findings. My furnace is 20 years old, and despite finding many smaller issues he was not pushy about replacing the entire thing. He just gave an honest assessment of the condition. Don correctly found the issue with the blower (bad controller board) and fixed the cause of the failure (plugged drain pipe, causing water damage). After replacing the board the furnace is back up and running. I'll be giving them a call when it is time to replace the furnace."
This image shows the wall mounted unit that will cool and heat the whole living room area without any noise.
Response time2 days
Response rate100%
5 neighbors recently requested a quote
Avatar for Behold Heating & Cooling Services
Behold Heating & Cooling Services
5.0(
87
)
Central A/C - InstallCentral A/C - Service or RepairCentral Humidifier - Install or Replace+2 more

Serving Castle Rock, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Great experience with seasonal maintenance check. They arrived early in appointment window, checked furnace, humidifier, & air conditioning, explained everything clearly. They replaced a filter, examined every part of air conditioning system, made some recommendations, had easy payment system. I will look forward to using them again!"
Mini Split Install
A nice, new, clean Boiler - restoring heat right in time for the evening!
Glad we were able to restore heat same day for this customer.  Replaced Furnace and A/C for proper installation, air flow and 10 year warranty on FULL SYSTEM.
Glad we were able to restore heat same day.   Full Boiler replacement, repipe and zone valves.
Mini Split Install

+67

20 neighbors recently requested a quote
Recommended by41%of homeowners
Avatar for Comfair Heating and Cooling LLC
Comfair Heating and Cooling LLC
5.0(
24
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+4 more

Serving Castle Rock, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"I hired Comfair for my hvac last weekend and I couldn't be happier with the results. Habib was professional, punctual, and knowledgeable. He quickly diagnosed and fixed the issue with my system and his pricing is really reasonable. Highly recommend Comfair with all hvac services."
Commercial
Commercial
Furnace fix
New  Unit install
Residential

+3

Response time3 hrs
Response rate100%
Avatar for Woelfel Heating & Air Inc.
Woelfel Heating & Air Inc.
4.2(
153
)
Central A/C - Service or Repair

Serving Castle Rock, CO and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

We pride our company on reliability, great communication, integrity, and quality work. We are experts Woelfel Heating & Air is a trusted, family-owned HVAC company proudly serving Northern Colorado. We specialize in heating and air conditioning repair, installation, and maintenance for all major brands. Known for our honest pricing, dependable service, and personal approach, we help homeowners stay comfortable all year long. Whether you need a quick fix or a full system replacement, our experienced team is ready to help with prompt and professional service.in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

Project Photos
Project Photos
Project Photos
Project Photos
Project Photos

+7

149 neighbors recently requested a quote
Recommended by75%of homeowners
Avatar for Epic HVAC, Inc.
Epic HVAC, Inc.
4.6(
63
)
Central A/C - Install - For BusinessCentral A/C - Service or Repair - For BusinessDuctless Mini-split A/C - Install or Replace+4 more

Serving Castle Rock, CO and surrounding areas

Approved

In business since 2008

Free estimates

Credit card accepted

"All Trades was able to get to my house within an hour and half of my phone call. The service man was very professional, kind, and helpful. He explained general maintence regarding the cooler when I asked and was very patient. I didn't feel like he offered any extra services to take advantage of my lack of knowledge. I would use this company again and have already recommended Service Magic to friends."
Best on the Front Range
Recommended by96%of homeowners
Avatar for Steele Bros. Heating, Inc.
Steele Bros. Heating, Inc.
4.4(
552
)
Central A/C - InstallCentral Humidifier - Install or Replace

Serving Castle Rock, CO and surrounding areas

Approved

In business since 1993

Free estimates

Emergency services offered

"These men walked me through the process with you so you know what they were doing. They cleaned everything and didn't leave anything behind. I was amazed at the communication these men had before and after the installation. The inspector came the next day to inspect our central Air Conditioning and he also said, "wow, these guys did a great job and they left nothing behind. They even went a step further to put this in." I would encourage you to hire these men, to do any work at your home."
Repiped Boiler to make it work properly
Repiped Boiler to make to work properly
Closet Boiler before picture
Closet Boiler after picture
Closet Boiler after picture

+10

Response time1 day
Recommended by97%of homeowners
Avatar for Aether Mechanical, LLC
Aether Mechanical, LLC
4.5(
106
)
Swamp Cooler - Service or RepairCentral A/C - Service or RepairCentral A/C - Service or Repair - For Business

Serving Castle Rock, CO and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"When our 20 year old air conditioner broke on a 905-100 degree weekend, it was definitely an emergency! I put in a request to HomeAdvisor and Aether responded that day and had someone out the next day! Our new air conditioner was installed the following Monday. Aether was prompt, profesional, and very hard-working. The installers worked all day (until 8 PM) to get us up and running again. I would definitely recommend Aether Mechanical and am very grateful to them for saving me from the heat!"
Mini-Split system
AC/Furnace Install
Cast Iron Boiler
AC Install
Boiler

+1

Response time7 hrs
Response rate89%
70 neighbors recently requested a quote
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FAQs for air conditioning projects in Castle Rock, CO

Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.

Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.

Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.

Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.

Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.

The Castle Rock, CO homeowners’ guide to air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.