• 24/7 Emergency Repair Service

  • For more information call (618) 277-5090

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  • O’Fallon, IL’s First Choice for Heating & Air Conditioning Companies

    Can’t control your comfort systems? It’s time to call your first choice for heating and air conditioning companies. In O’Fallon, IL, people know Delta Heating & Cooling is the place to go for heating, air conditioning and air quality services throughout the surrounding communities of the Metro-East area. As a family-owned business, we understand your frustration when air conditioning won’t keep you cool and heating won’t keep you warm. We’re here with more than 30 years’ experience to provide fast, affordable and friendly service to our local community. If you notice problems with your comfort systems, it’s time to call our staff for a free estimate of your repair needs!

  • Heating Systems Repair & Installation O’Fallon, Illinois

    When it comes to heating systems, it pays to know a local professional that understands the ins and outs of all different types of systems. We provide heating system repair and installation to local customers including all makes and models of commercial and residential systems. Our heating services include:

    • Heating Repair
    • Heating Installation
    • Gas & Electric Furnaces 
    • Gas & Electric Heat Pumps
    • Heating Tune-Ups
    • More… 
  • Your Local Air Conditioning Specialists O’Fallon, IL

    We all know that feeling when the air conditioner breaks on the hottest day of the year. The only thing you can do – call the pros at Delta for commercial and residential service when you need it most. We service all systems and provide the following services: 

    • Central Air Conditioning
    • Ductless Mini Splits
    • Air Conditioning Repair & Installation 
    • Air Conditioning Tune-Ups
    • Refrigerant Check & Recharge
    • More… 
  • Air Quality Experts O’Fallon, IL

    We rarely think about the air we breathe inside of the home. However, this air could be badly tainted with allergens, dust particles and more. Call us for air quality solutions that will filter out the bad so you can breathe in the good. Our available air quality solutions include: 

    • HEPA Filters
    • Home Humidifiers/Dehumidifiers
    • UV Lights
    • Air Purifiers 
  • Why Choose Delta?

    • Over 30 Years’ Experience
    • Family-Owned & Operated
    • Service All Makes & Models
    • Gas & Electric Systems
    • Residential & Commercial Service
    • Same-Day Service
    • 24-Hour Emergency Service
    • FREE ESTIMATES