Den-Son Inc. Cooling & Heating Customer Reviews

  • We are so glad we called Den-Son to replace our old air conditioning unit. I really cannot say enough good things about the company. They were professional, thorough, honest and have competitive pricing. We did not have to wait long for our new unit which we love. It is quiet and the house is cool! ... Read More
  • Great service! Affordable and trustworthy. Thanks to the whole team for all of the work installing our new ac and furnace. We highly recommend using them.
  • Thank you for such a great experience. The Den-Son team installed a split geothermal system on time and with great professionalism despite weather and other blockers completely out of their control. They worked diligently to exceed my expectations. They listened to my needs and provided me with th... Read More
  • Rick & Nate were great. They did what they said they'd do with no problems. They seem to care about the quality of service they're providing. I would recommend.
  • Great local business and very responsive when our AC went out. They got both our heating and cooling systems replaced right before the 90° weather gets here. Their furry front desk staff are also very welcoming!

HVAC Repair and Installation Specials

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Our Latest News

4 Ways Humidity Levels Affect Indoor Comfort in Alton, IL
July 15, 2022Read More
3 Reasons to Invest in an HVAC Maintenance Plan in Jerseyville, IL
June 2, 2022Read More

Why Choose Us

  • 24/7 Emergency Service
  • Family-Owned Since 1972
  • Trane Comfort Specialist Dealer
  • 100% Satisfaction Guaranteed

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We Proudly Serve the Following Areas

  • Alton, IL
  • Bethalto, IL
  • Brighton, IL
  • Bunker Hill, IL
  • Carrollton, IL
  • Chesterfield, IL
  • Cottage Hills, IL
  • Dorsey, IL
  • DOW, IL
  • East Alton, IL
  • Godfrey, IL
  • Grafton, IL
  • Hartford, IL
  • Jerseyville, IL
  • Kane, IL
  • Medora, IL
  • Piasa, IL
  • Roxana, IL
  • Shipman, IL
  • South Roxana, IL
  • Staunton, IL
  • Wilsonville, IL
  • Wood River, IL
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