Serving Walkersville, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2002
Free estimates
Emergency services offered
"They are prefect! Lifetime heating and air conditioning company."
+47
Serving Walkersville, MD and surrounding areas
Approved
In business since 1936
Free estimates
Emergency services offered
"McCrea’s technician John Kline was extremely professional, courteous and knowledgeable. Very satisfied with services received today. Would highly recommend them. This company offers military/veteran discount. So happy I inquired about the discount. Thank you McCrea Heating & Air Conditioning."
Serving Walkersville, MD and surrounding areas
Approved (Corporate)
In business since 1970
Free estimates
Warranties offered
"Angie's List reviews made me go with GAC Services for a new furnace and air conditioning unit. Five mechanics showed up early in the morning in three trucks. They were clean cut young men and very polite. They made a lay down area in my basement with blankets. They wore covers over there shoes while in and out of the house. They were very respectful of my home. They worked non stop until 5:00 PM. They had a separate sheet metal mechanic that showed up and did really nice sheet metal work. I was impressed. After a year went by my thermostat went out and they came out and replaced it free of charge. I signed up for the maintenance contract and they come out twice a year . Once in the winter and once in the summer. Another part went bad after two years and it was under warranty and they replaced it free of charge. They are honest and reliable. I highly recommend them."
Serving Walkersville, MD and surrounding areas
Approved
Credit card accepted
Customers say: True professional
"Edmond responded right away and listened to my explanation of the issue over the phone. It was Friday afternoon and we both agreed the issue was non-urgent so we scheduled an early Monday morning visit. He showed up at 8a sharp as we agreed and he did a thorough check of our AC system. Edmond is very knowledgeable and he explained everything thoroughly. He gave me a couple of suggestions. I’m pretty handy so I’ll try to tackle it myself. He said to just call him if I get stuck and he could either come back out or coach me over the phone. Pricing is reasonable and quality of service is top-notch. I’ll keep them on speed dial and I highly recommend Hecomo for HVAC service!"
+8
Serving Walkersville, MD and surrounding areas
Approved
In business since 2014
Free estimates
Emergency services offered
"The replacement of air conditioning system was done smoothly. The salesperson - Adam - explained me all pros and cons of various options, and we agreed on the option which is cost efficient and took into account all my preferences. The installers - Shane and Shon - are nice guys, worked efficiently and have done the job in half a day. They even fixed some part of my heating system free of charge. Overall, very positive impression, highly recommend."
Serving Walkersville, MD and surrounding areas
Approved
In business since 2019
Free estimates
Warranties offered
"Just started working with Markool this summer and they have been fantastic! When I need service, they are so fast and every person we have interacted with has been polite, knowledgeable and personable. We unexpectedly needed to replace our system during a heat wave and they were super. So responsive and quick. I would highly recommend Markool for all of your HVAC needs!"
Serving Walkersville, MD and surrounding areas
Approved (Corporate)
In business since 1945
Free estimates
Emergency services offered
"My husband and I were very happy with the service we received from ARS and we will continue to employee them for all our air conditioning needs."
Serving Walkersville, MD and surrounding areas
Approved
In business since 1989
Free estimates
Emergency services offered
We are a small family owned Heating, Ventilation, and Air Conditioning (HVAC) company located in Sharpsburg, MD. The business was started in 1989 under the name of RW Harrell's Pump Service Inc. when Diane Harrell and Ronnie Harrell purchased a well pump and water system business from a gentleman that was retiring. Ronnie had worked in the HVAC field from the time he had graduated from high school so it was natural to add HVAC to the services that this new company would offer. Ronnie and Diane built the company by word of mouth and continue to grow the company in this manner. Additional DBA - Harrell's Services. Additional fax - 928-492-8004
+5
Serving Walkersville, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2024
Free estimates
Credit card accepted
"I recently had SPECS Heating & Cooling install an AprilAire humidifier for me, and I couldn't be happier with the results. From start to finish, their service was exceptional. The team was professional, knowledgeable, and efficient, ensuring that the installation process went smoothly. Since having the humidifier installed, my indoor air quality has significantly improved, and I've noticed a positive difference in the comfort of my home. I highly recommend SPECS Heating & Cooling for their top-notch service and expertise in HVAC solutions. Five stars all around!"
Serving Walkersville, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2015
Emergency services offered
Warranties offered
"Very fine and courteous service. When the replacement vent/light bathroom fan didn't fit he ordered another. The new fan was quickly installed the next day."
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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