Serving Knoxville, TN and surrounding areas
Approved
In business since 2000
Free estimates
Credit card accepted
"We have been using Admiral Heating and Air for both service and new installation for 16 years. They are always prompt and do an excellent job. The spring and fall maintenance program is a great way to make sure everything is in good working order. John is the best!"
+269
Serving Knoxville, TN and surrounding areas
Approved
Super Service Award Winner
In business since 2025
Free estimates
Credit card accepted
"Great job!! Very pleased with Friends Heating and Air who installed a new package air conditioner for our cabin! They were prompt, professional, very knowledgeable & highly competitive. Strongly recommend!!"
Serving Knoxville, TN and surrounding areas
Approved
In business since 2018
Free estimates
Emergency services offered
"Amazing! Professional, courteous, honest, and skilled! I will use Smith mechanical heating & air for hvac forever! Highly highly recommend!!"
+3
Serving Knoxville, TN and surrounding areas
Approved
In business since 2017
Credit card accepted
Customers say: Quality work
"Excellent response time and diagnosis of problem. Made repairs expeditiously and verified operation of problem unit as well as checking operation of the lower level unit before leaving. I would definitely recommend Bruce and his company to anyone needing air conditioning repair."
+2
Serving Knoxville, TN and surrounding areas
Approved
In business since 2003
Free estimates
Emergency services offered
"They came into my mothers older home and explained everything they were doing, step by step. They replaced her unit and made improvements to her air ducts. They were honest and courteous! They left her feeling comfortable and safe and as if she were being treated like family. I cannot speak highly enough of Premier Services Group! I highly recommend this company!"
+11
Serving Knoxville, TN and surrounding areas
Approved
In business since 2009
Free estimates
Emergency services offered
"Responsive and informative while patiently explaining and fixing the problem with our air conditioning ventilation. Strongly recommend Honest A/C."
+6
Serving Knoxville, TN and surrounding areas
Approved
In business since 2022
Free estimates
Credit card accepted
"AC Heating and Air were punctual, tidy and thorough and last but not least they were friendly! All characteristics that are very important to me! Would definitely call them to come out again if needed."
+1
Serving Knoxville, TN and surrounding areas
Approved
In business since 2013
Free estimates
Emergency services offered
"My air went out during the night on July 29, forecast was for 95 degrees that day. After waiting 2 hours for a callback from another company, I called Calvin and he arrived just after lunch. He quickly diagnosed and replace my outdoor fan motor and had me back up and running."
Serving Knoxville, TN and surrounding areas
Approved
Free estimates
Offers commercial services
"We needed some help with an electronic air cleaner we had installed by another hvac company (they claimed that the unit was working properly) Martin came by and confirmed that there was an issue. He spent time talking to the manufacturer and then helped us solve the issue in a timely and cost effective manner. He also did a routine yearly cleaning of our A/C unit and the furnace, and we are very pleased with the work and experience. 10/10 for communication, ease of scheduling, and value of the work. I highly recommend Martin for all of your HVAC needs"
Serving Knoxville, TN and surrounding areas
Approved
In business since 2023
Free estimates
Offers commercial services
"Dustin did a great job and dedicated a large chunk of the day to the proper installation of two Ring floodlight cams. Outstanding customer service at a fair price."
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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