Get matched with top heating and air conditioning pros in Darien, IL

"I received same-day service when calling to make an appt. The service tech was punctual, efficient, thorough and gave me an awesome deal on multiple furnaces. Did not overcharge, or recommend unnecessary work. Seems trustworthy. Will definitely consider this company again for any of my hvac needs in the future!!"

"The technician did a very good job cleaning the hvac ducts."

"Highly recommend. Found this company last year on Angie's List and this is the second time using them. I was in a pinch as the A/C went out and we have a little baby. I called and they got someone out the same day. Jeff was great...knowledgeable, friendly and answered a lot of questions! Got the unit working again! These are my go-to HVAC guys!"

"Fabulous! I have used vent heating & cooling many times over the years. Jim has always provided exceptional service- highly recommend!"

"HVAC machine outside wasn’t working. Ricardo ? was so good at explaining & suggesting his expert ideas. There was a mouse & nest inside the machine & wires were severed. He removed the critter & nest & repaired the wires. All is working again. What a great guy he is!!"

"Everyone from the sales person to installers were great. I love our new HVAC system!"

"Brian was the sales person and thankfully he was the first person of four to bid on our job. He took the time to explain what we really needed, why we needed it as well as what we didn't need and why we didn't need it. His professionalism, knowledge and ability to explain HVAC to someone who is not familiar with it made all of the difference. None of the other three companies met the standard he set. The real icing on the cake was that the TR Miller bid was also the most affordable.
Ben and his team came to install the system today. They were on time. They were very accommodating. They worked quickly, efficiently, remarkably quietly and effectively. Ben took the time to explain how everything was installed and why it was installed the way it was. He also explained fully how the thermostat and humidifier work.
Our house, inside and out, is cleaner and neater than when they began their work.
We couldn't be happier. I will actively recommend their service to anyone."

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.

"Professional service, extremely skilled at diagnosis issue. Will continue to do business with Long Shun HVAC"

"AWE promptly responded to my work request and kept me informed about my appointment status. Peter came to perform the work. He was very thorough and even discovered that the HVAC contractor on our new home installed 2 furnaces: a current year model as well as a prior year model that was more prone to breakdowns. Provided great information and would definitely hire again. Thanks!"