Serving Dundee, IL and surrounding areas
Approved
In business since 1946
Free estimates
Emergency services offered
"Very well. The tech did a thorough job checking both the furnace and air conditioning unit. He answered any questions we had,"
+2
Serving Dundee, IL and surrounding areas
Approved
In business since 2016
Free estimates
Warranties offered
"Mike was very professional and courteous. He informed me of what exactly would be done and kept me abreast of the progress to remove and install two new air conditioner condensers and coils in new plenums. His price was fair and the job was done on time. I highly recommend him and Air Temperature Pros when you need service."
+4
Serving Dundee, IL and surrounding areas
Approved
Super Service Award Winner
In business since 2002
Free estimates
Warranties offered
"The service was excellent. Adrian arrived promptly and was professional throughout the service process. We truly feel that there’s a higher level of air quality in our home following the process. I would highly recommend Mr. Duct if you’re in need of high quality air duct cleaning services. Scheduling was also extremely easy and the office was highly and promptly responsive to all of my questions."
+81
Serving Dundee, IL and surrounding areas
Approved
Super Service Award Winner
Free estimates
Emergency services offered
Warranties offered
"Excellent experience from start to finish! The technicians arrived on time, cleaned our air ducts thoroughly, and serviced our heating system perfectly. The air quality improved instantly. Professional, friendly, and extremely reliable service overall."
+20
Serving Dundee, IL and surrounding areas
Approved (Corporate)
In business since 1911
Free estimates
Emergency services offered
"The air conditioner is working fine."
+10
Serving Dundee, IL and surrounding areas
Approved
Super Service Award Winner
In business since 2014
Free estimates
Emergency services offered
"This business is the company that bought the older Barrington Heating and Air Conditioning. I have relied on Barrington to service my house furnace and A/C for more than 50 years. They have come to my rescue more than once. My service technicians have become friends, not just repair people."
+1
Serving Dundee, IL and surrounding areas
Approved
In business since 2003
Free estimates
Emergency services offered
"He was very good. I had some company coming from out of town and my air conditioning wasn't working. He came that day to fix it. He knows what he is doing. He gets the job done. He came within 1/2 hour of my phone call because he was in the area. He got my air conditioner going right away. It was really hot that day. He took care of it right away. He could have tried to tell me it was the compressor or something, but he didn't. He was prompt, he did a good job, and he was fair. He installed a furnace and air conditioner at my mother's house as well. He did a good job there too. He was here previously to try and quiet down my air conditioning, but nothing seemed to work too well. He was really good on the installation, but I thought he was a little high on the repair. "
Serving Dundee, IL and surrounding areas
Approved (Corporate)
In business since 1971
Free estimates
Emergency services offered
"We had a great experience with Four Seasons Heating & Air Conditioning during our recent replacement of our furnace and AC unit. They were very professional and completed the job on time and answered all of my questions. Would recommend them for our Heating, Air Conditioning, Plumbing and Electrical needs."
Serving Dundee, IL and surrounding areas
Approved (Corporate)
In business since 1992
Emergency services offered
Warranties offered
Precision Today is a trusted multi-trade contractor with a expert technicians specializing in HVAC services for residential properties. We deliver fast, safe, and reliable solutions—backed by same-day service.\n\nOur HVAC services include heating and cooling system installation, furnace and AC repair, seasonal maintenance, ductwork services, thermostat upgrades, and energy-efficient system replacements. Whether you need a quick repair or a full system upgrade, our technicians work with precision and attention to detail to keep your home or business comfortable year-round.\n\nWith locations in Carol Stream, West Chicago, Grayslake, Palatine, Franklin Park, and Naperville, we provide efficient coverage across the surrounding Chicago suburbs—allowing us to respond quickly and keep your project moving.\n\nIf you’re looking for a responsive, professional contractor who prioritizes safety, speed, and quality, Precision Today is ready to help—often the same day you call.
+49
Serving Dundee, IL and surrounding areas
Approved
In business since 2016
Free estimates
Emergency services offered
"I went online Mon nite, they called me within 10 mins, came out the next day & fixed the air at a very reasonable price"
+79
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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