Proudly serving Fairfield County

for over 45 years


CAS Logo CAS Logo

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When your office, factory, or agricultural building needs air conditioning service, call Custom Air Systems, Inc. You'll get fast, personal attention. In an emergency, we're here for you 24 hours a day. We also work on several different heating systems — both residential and commercial — such as boilers, radiant heat systems, furnaces, and heat pumps. We offer residential maintenance programs too.  

Proven Products and Excellent Service

"Please tell the service people and your operator how pleased we are with their personal attention. The best to a unique company!"

- R.E. Stilson

  • Air conditioning installation and replacement

  • Air conditioning repair and maintenance

  • Ductless mini split systems and geothermal systems

  • Heat pump installation and replacement

  • Heat pump repair and maintenance

  • Thermostats and zone systems

Enjoy comfortable temperatures in your business year round

We Offer Free Estimates  


  • Over 45 years of experience

  • Major credit cards accepted

  • Financing available

  • Excellent reputation

  • 24/7 emergency service

  • Family-owned and operated