Serving Boulder, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2004
Free estimates
Offers commercial services
"Shane and PAC Air tech, Ray were both great. Job was well done and done quickly despite Summer crush!"
Serving Boulder, CO and surrounding areas
Approved
In business since 2015
Emergency services offered
Warranties offered
"My air went out yesterday, temp in the 90s. Mario called me this morning, a Sunday morning!! He was on his way home after another job and said he could come right over. He diagnosed the problem and fixed the situation, and the air came right on! Amazing, friendly and professional experience, soooo thankful. Thank you Steven and Sons!!"
+47
Serving Boulder, CO and surrounding areas
Approved
In business since 2018
Free estimates
Emergency services offered
"I just needed some simple advice regarding the filter in my central heating and air system. Adrian explained exactly what I needed and why. He saved me from unintentionally restricting airflow and burning out my entire system. He a Very knowledgeable and an all around good guy. Highly recommend this company."
+4
Serving Boulder, CO and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1978
Free estimates
Emergency services offered
"They have service my furnace and air conditioner for years"
Serving Boulder, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Free estimates
Emergency services offered
"Chris and his team were great. They cared enough to put on shoe covers while walking in my home. Chris was very informative about the humidifier installation process. Thanks"
+67
Serving Boulder, CO and surrounding areas
Approved
In business since 2008
Free estimates
Emergency services offered
"We had two AC units and a new furnace installed they were prompt, efficient, very respectful and great customer service! Dean was an absolute pleasure to work with, they have earned my business for life on any HvAC services I might need! Highly recommend"
+3
Serving Boulder, CO and surrounding areas
Approved
In business since 2014
Emergency services offered
Warranties offered
"Brent was absolutely professional and awesome, he did a great job repairing our furnace in a timely manner, I highly recommend A Moonlighting Heating and Air Conditioning, thanks again Brent!"
Serving Boulder, CO and surrounding areas
Approved
In business since 2025
Free estimates
Emergency services offered
"Needed help solving multiple electrical problems with my furnace and AC and the owner of the business was very thorough and honest with his recommendations and in explaining and showing what he was doing He fixed the problem in under 24 hours and everything is up and running fine. Will contact again if I need further work."
+209
Serving Boulder, CO and surrounding areas
Approved
In business since 1983
Free estimates
Credit card accepted
"I had AAA out twice; once to clear clogged drains and again to service a toilet. Both technicians, Andre and John J, were highly knowledgeable, professional, on time, and extremely honest. Honesty goes a long way with me so I will gladly use AAA for all my plumbing & heating needs! I really appreciate getting a text message with the technicians photo prior to the appointment as well. Great company!"
Serving Boulder, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2020
Free estimates
Emergency services offered
"He had Angel come to fix some furnace issue we were having during a snow storm and it was a wonderful experience! We re-hired him and his partner Lee to come help with some small appliance help - replacing some faucets and installing a vanity for us. Excellent people to work with, very friendly, knowledgable and communicative! Will definitely be a repeat customer of him for all our furnace/air conditioning and small project needs!"
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.
From average costs to expert advice, get all the answers you need to get your job done.
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