Serving Vienna, VA and surrounding areas
Approved
In business since 2008
Free estimates
Emergency services offered
"Relax Air was awesome. I called them on a Monday and by that Friday I had a new AC unit. Very professional, competitive priced. I would recommend them for any HVAC service."
+12
Serving Vienna, VA and surrounding areas
Approved
In business since 2017
Free estimates
Emergency services offered
"Our air conditioning was not working and our house was extremely hot. I called on a Sunday afternoon and Matt came later in the afternoon and fixed our problem. Our air-conditioning is working again and we will finally be able to have a good night sleep. I was thrilled that Matt came out on a Sunday evening and fixed our problem. He also took the time to show me how to change the filters in our unit and had me practice to make sure that I could do it by myself. I would highly recommend Conde Tech Services."
+2
Serving Vienna, VA and surrounding areas
Approved
In business since 2001
Free estimates
Warranties offered
"They installed a new boiler and central air conditioning in my DC rowhome and did a fantastic job. Joe answered all of my questions and they stayed on schedule with the project which was great because it was a larger project. I would highly recommend their services for the quality of workmanship and their prices were very reasonable as well. I will contact them again for future HVAC work in the DC area."
Serving Vienna, VA and surrounding areas
Approved
In business since 2012
Free estimates
Emergency services offered
"I was very pleased with the work they did. Diego was most knowledgeable, very polite and personable. I was very happy that I chose BlueStar air as my HVAC contractor. They were very responsive to my requests and gave me sound recommendations. I will be recommending them to both my family and friends. They made me feel that I was taken care of, which is all I can ask. I am a very happy customer!"
+13
Serving Vienna, VA and surrounding areas
Approved
In business since 1936
Free estimates
Emergency services offered
"The technician (Shammion) arrived on time and spent time listening to my concerns and answered my questions before proceeding with the work. Shammion has serviced my furnace and a/c unit previously, and on each occasion he has spent time informing me how various parts of my HVAC should work and what I need to do to get the most from the systems. On this occasion, Shammion instructed me on how to use my new thermostat and how best to keep my condenser coil clean in the future. The work was done expertly and in a professional manner, and I highly recommend Shammion and McCrea Heating and Air Conditioning."
Serving Vienna, VA and surrounding areas
Approved
Super Service Award Winner
In business since 2016
Free estimates
Emergency services offered
"Quickly diagnosed the central air conditioning system, and gave an estimate on the cost of recharging the refrigerant in the compressor. The system is a 14 year old Carrier unit. Albert also included some sealant that may plug up the slow leak of refrigerant that occurs every 2 years or so. Albert also, showed me how to adjust the damper to control the flow of air to the second and third floors of the house. The other company that arrived wanted to charge me $5,000 to repair the system or close to $7,000 to replace the AC system with new. I intend to call upon Magna Tech Temp Air, Inc when I'm ready to purchase a new HVAC system. Thanks again for taking the time to listen to my concerns. Well done!!!"
+4
Serving Vienna, VA and surrounding areas
Approved
In business since 2015
Free estimates
Emergency services offered
"On a very hot weekend, I lost my air conditioning and could not reach my regular HVAC contractor. I made contact with I-HVAC first thing Monday morning and they fit me into an extremely busy schedule even though I had not used them before. Sam was a good communicator - explaining everything as he worked, providing tips on what I should be doing. I would recommend them whole-heartedly. They are now my regular contractor!"
+5
Serving Vienna, VA and surrounding areas
Approved
In business since 2009
Free estimates
Emergency services offered
"I discovered my heat pump fan not working on a Saturday after midnight. I sent in a request to homeadvisor and this company responded at 7:30am Sumday with tech availability the same day. They came out and found the problem right away. Their prices are very reasonable especially since it was the weekend. I would highly recommend them for all your heating and air conditioning needs. I will be keeping their info handy for future needs."
+3
Serving Vienna, VA and surrounding areas
Approved
In business since 1936
Free estimates
Emergency services offered
"We had them Replaced furnace and air conditioning unit. It was installed about a year ago but they came out for a regular service about a month ago. the service was free, part of the contract. I have no complaints, it was all good. They were responsive. they were punctual. I have no problems, it was a good deal when I bought it, it's a good deal now. I don't have any issues with how the service went. i bought it through them and I have no regrets and everything was the same as I felt when I bought it. It was a good deal, I made the right choice. Anytime you buy a major system and it doesn't go right you have a problem. I'm a happy camper.1 worker took less than an hour to complete."
Serving Vienna, VA and surrounding areas
Approved
Super Service Award Winner
In business since 2024
Free estimates
Emergency services offered
"Oscar and Ronnie came and installed my AC unit. They were friendly and did the job in a timely manner."
+11
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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