
Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2008
Emergency services offered
Credit card accepted
"They did a good job"





+21


Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2008
Emergency services offered
Credit card accepted
"They did a good job"





+21

Serving Sunnyvale, TX and surrounding areas
Approved
In business since 1990
Free estimates
Emergency services offered
"We scheduled a 4 pm appointment. By 4:45, no one showed up or called to confirm their whereabouts. I had to call Metro Air and ask what was going on. The secretary said she will dispatch a technician to my house. The technician did not arrive until 5:30. He was kind and was able to fix the capacitor, which was causing the issue. About a week later, their office followed up. I told the lady that the a/c was on, but now there was another sound coming from the system. The secretary indicated that the technician would call me that day to discuss and set up a follow up visit to address the issue. No one ever called."


Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2009
Free estimates
Credit card accepted
"Great service always! Techs are professional, knowledgeable and personable. Office staff is friendly and respectful. Overall, I know the people at Extreme Air actually care about providing me with the best service they can."





+7

Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2021
Free estimates
Warranties offered
"Ishmael was super responsive and his team did an excellent job replacing our 20+ year old ductwork and blew in insulation after. They laid down canvas on the floors to keep it clean and they carried off the trash when they were done."



Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2025
Emergency services offered
Warranties offered
"I was just getting home from work and I happen to noticed that my house was really hot, the thermostat was reading 85 degrees while set for cool, the blower was working but my air conditioning system would not come on. I stepped outside and walked over to the system and heard a buzzing noise but nothing was working so I went on to my app and requested for an air conditioning company and Young and son stopped by the same day. Julius was able to diagnose the problem I was having with my AC system and explain the buzzing noise, within a short period of time my air conditioning system was working and providing my home with cold air. Thank you!!!!! So much young and son, I am going recommend your services to all of my friends and relatives."





+25

Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2022
Free estimates
Emergency services offered
"Got the job done right and quickly! Great unit! It was residential replacement of Central Air Conditioning Unit."




Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2002
Free estimates
Emergency services offered
"Chris was great, very knowledgeable and nice. Turns out it was a super simple fix that didn't even require any parts or tools so he didn't charge us a dime. Another company wanted to do a full replacement totaling over $2500. Great guy, we'll definitely be calling them for any plumbing issues in the future."





+83

Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2006
Free estimates
Emergency services offered
"I have used Southern Air for several years on my personal home and for rental properties. I would not even consider using another provider. High integrity, honest and fair prices."





+1

Serving Sunnyvale, TX and surrounding areas
Approved
In business since 2003
Free estimates
Emergency services offered
"The lady that answered the phone was very polite and scheduled the appointment to my convenience. The tech. Arrived 10 mins early and presented himself very professionally also his van looked very nice. Upon diagnosing the problem he explained all my options and gave me his recommendation as to what my next step should be. I decided to replace bad part and get the air conditioner tuned up. I'm was extremely satisfied with the level of service I received from mechanical comfort systems, and will use the company again for future repairs and maintenance.
"




Serving Sunnyvale, TX and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1991
Free estimates
Emergency services offered
"Great service technician. Very courteous and knowledgeable. Recommend using ARS for your Air Condition repairs."





+4
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.
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