Client Testimonials

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Here’s what our clients have to say about us!

“We purchased our hvac system from Crestside almost a decade ago. Didn’t think to post a review til a man named Jason did a Spring maintenance check yesterday. They’ve been a great company to deal with, and Jason provided excellent service. He even showed me a video on his phone of how much pollen he removed from our outside unit. I’d highly recommend this company. We’re also going to request Jason for our next service call.”

- Nestor F.

“We have had this furnace and heat pump that Crestside installed for almost 20 years. We have the maintenance agreement and Jason comes out every six months to inspect the system. Could not be happier with his service. Always dies a thorough job. We request Jason when it is time for our tune up.”

- Bruce A.

“We had Jason as our technician to fix our HVAC. He was quick in his work and even helped us with setting up our scheduled thermostat with easy step-by-step instructions so that if we ever need to change it in the future we’ll know how. I will be recommending Crestside Heating and Cooling to my friends and family.”


“Jason is great! Very friendly and always detailed in his work.”

- Jake C.

“After getting estimates for a new furnace and ac system from three different companies, we chose Crestside. Jeff took time one evening to explain in great detail how the system needs to be sized properly and the expectations of different seer ratings. We were looking for a higher efficiency system and we feel the American Standard system that Jeff recommended was the right choice. He was very personable and accommodating in helping us make an informed decision. The installers were very professional and left no mess behind. The system is much quieter than our old system and is cooling well. We are looking forward to lower utility bills. We recommend Crestside to anyone in need of a new furnace and/or air conditioner.”

- Bill W.

“I bought my Furnace and AC from Crestside 13 years ago. Still running great. I get my annual spring/fall inspections and cleanings and the service techs couldn’t be any nicer and professional. When the day comes, my next system will be from Crestside Ballwin.”

- Sue M.

“Dan does excellent work, for a great company.”


“Dan is great; for 18 years he has kept my air conditioning and furnace running perfectly!”

- Pamela W

“I use these guys for all of my heating and air conditioning needs. They are prompt, courteous and professional every time. I have had experience with other dishonest companies that try to sell you something you don’t need. Not these guys, they are honest and will tell you exactly what you need to get back up and running. Jason is my usual tech and he is awesome.”

- Mike M.

“We’ve been doing business with Crestside for over 15 years and have always been happy with their work. We usually have Jason come by because we like him and he always does a great job. Thanks for being there when we need you …!!!”

- Gary W.