Serving Marietta, GA and surrounding areas
Approved
Super Service Award Winner
In business since 1966
Free estimates
Emergency services offered
"Very good service and was on time. I use Cool Ray for all my air conditioning and heating ."
Serving Marietta, GA and surrounding areas
Approved
In business since 1995
Free estimates
Emergency services offered
"A giant shoutout to Atlanta Air Authority for coming to our rescue this week. We came home from being out of town on Sunday to a hot house. Our A/C unit was toast. Their quick response and fantastic service had us back up and running with a new unit within 3 days. Canâ t say enough good things about them. Definitely check them out next time you need HVAC service!!"
+9
Serving Marietta, GA and surrounding areas
Approved
In business since 1986
Free estimates
Emergency services offered
"This was my second quote and this company is amazing. Quickly identified the issue, changed the motor, provided a filter and made sure everything was working on one trip within a few hours. The previous company (Air Pros, LLC) said it was unfixable and tried to sell me a new unit over $6k which was a huge scam. Don't go to those guys, work with this family owned honest business. Keep in mind HVAC repairs in many cases are not cheap, I own 3 houses and have paid several hundred or more when an HVAC is old and need repairs."
Serving Marietta, GA and surrounding areas
Approved
In business since 2006
Free estimates
Emergency services offered
"Dean and his team did in excellent job in installing my NEW HVAC system. I had been nursing my old system for the last couple of years. I finally went to the most trusted HVAC company that have worked with for years. The new system chills my first floor down in minutes. I should have done this sooner. Thanks for the all the folks that did the work and the professional staff in the front office and Sales."
+48
Serving Marietta, GA and surrounding areas
Approved
In business since 2010
Emergency services offered
Warranties offered
We are a full service HVAC company. Our services include: diagnostic, maintenance service, repair, replacement, retrofit, pre-purchase inspection, and second opinion. We will diagnose, design and install the correct heating and/or air conditioner system to fit your individual needs. We are fully insured and bonded. We provide unsurpassed service and experience. We are timely and organized. Our strength lies with our integrity, knowledge, and faith. We Supply Our own parts, any parts supplied by consumer will come with additional fees. Diagnostic Fees Due at time of service $79.00 daytime / $118.50 after 5pm. \n
+18
Serving Marietta, GA and surrounding areas
Approved
Super Service Award Winner
In business since 2019
Free estimates
Emergency services offered
"Gio S. was our technician. He was super friendly explained everything in detail & best of all my air conditioning is working again. Highly recommend Guardian Heating & Air. Called this morning received same day service while many others were not available. Thank you!"
+3
Serving Marietta, GA and surrounding areas
Approved
In business since 2009
Free estimates
Credit card accepted
"Repaired stalled air conditioner promptly, efficiently, and reasonably."
Serving Marietta, GA and surrounding areas
Approved (Corporate)
In business since 1898
Free estimates
Emergency services offered
"The tenant in my rental property stated she had no cold air blowing. That day I called around for estimates and times to get to it, in busy hot July. I spoke with Moncrief early in the afternoon, and they were able to come out that evening and fix the issue - for a reasonable price, with honesty and integrity. Thanks.
"
Serving Marietta, GA and surrounding areas
Approved (Corporate)
In business since 2011
Emergency services offered
Credit card accepted
"I am very satisfied with the product and the service provided by Cool Air Mechanical and their technician, Sean Haynes. Sean did an excellent job of installing an air purification system. Sean also performed the annual checkup on my A/C system. I highly recommend Cool Air Mechanical and especially Sean for any air conditioning service."
+35
Serving Marietta, GA and surrounding areas
Approved
In business since 2013
Free estimates
Warranties offered
"The response to my call was amazing. They came out at 7:00 pm. I had come home from work and my Air conditioning was not working. Very professional and did not mind explaining everything to me. Highly recommend."
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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