Serving Sylmar, CA and surrounding areas
Approved
In business since 2005
Free estimates
Emergency services offered
"My experience with heating and air conditioning repair, replacement, and new installation was excellent. Their staff was amiable, well-informed, and meticulous. Our device is operating more efficiently than before. Really trustworthy service!"
+24
Serving Sylmar, CA and surrounding areas
Approved
In business since 1988
Free estimates
Warranties offered
"My interaction with Air-Tech went very smoothy. Alex Fish, the customer representative was very professional and easy to work with. He provided a clear and detailed proposal , with options, before leaving the site on his first visit. Alex stayed in communication throughout the project. As a result of this experience I plan to have Air-Tech take over the maintenance on my main HVAC system."
+8
Serving Sylmar, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2006
Free estimates
Emergency services offered
"I called and they sent someone out the next day. They were prompt and efficient and most of all the swamp cooler was repaired. The price they charged was excellent. I also signed up for a maintenance contract based on how well they took care of this problem. There are not a lot of places left who service swamp coolers so this was a good find. I have already recommended them to my sister for service on the air conditioning system in her home."
+6
Serving Sylmar, CA and surrounding areas
Approved
Super Service Award Winner
In business since 1985
Free estimates
Credit card accepted
"This was the second time Tim has done work for me. He installed the heating system two years ago and now the central air conditioning. His crew was very fast, clean and pleasant. I could not ask for better service.. My son, who is in the business out of state, said the price was very good."
+50
Serving Sylmar, CA and surrounding areas
Approved
In business since 1967
Free estimates
Emergency services offered
"Arrived on time and fixed the problem. A bit more expensive than I would have liked but checking around probably not much more than elsewhere and our air conditioner was fixed same day in the middle of a heat wave."
+10
Serving Sylmar, CA and surrounding areas
Approved
In business since 2025
Free estimates
Emergency services offered
"Sayed Haroon was very happy professional and helpful and very informative, I would recommend him for any service and next time if there?s a problem with any of my air conditioning system I?m definitely gonna be dealing with him"
Serving Sylmar, CA and surrounding areas
Approved
In business since 2012
Free estimates
Credit card accepted
Here at Active Air Specialists, we sustain our business on quality and integrity. With over 20 years of experience we are experts in the Heating and Cooling trade and are committed to quality from the beginning to the end of your project. please call our office @ 888 410 0677 We look forward to earning your business. Give us a call or click to schedule a quote today!
+7
Serving Sylmar, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2022
Free estimates
Emergency services offered
"My AC stopped working in the middle of the heat, and Just Be Cool Supply came out the same day. Joel and Dyon were professional, honest, and quickly found the problem. They explained everything clearly, gave me a fair price, and had my AC running again in no time. It’s hard to find a company that’s this reliable and doesn’t try to sell you something you don’t need. I highly recommend Just Be Cool Supply to anyone looking for fast, affordable, and quality HVAC service. Thank you again for the excellent work!"
+11
Serving Sylmar, CA and surrounding areas
Approved
In business since 2019
Free estimates
Warranties offered
"Installed a new HVAC system. They were punctual and professional. I'm very pleased."
+87
Serving Sylmar, CA and surrounding areas
Approved
In business since 1994
Warranties offered
Credit card accepted
"Ask for Gary. He is the best HVAC technician."
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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