Proudly serving Fairfield County

for over 45 years


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When your heating system fails during a Connecticut winter, it's a serious matter. Get in touch with Custom Air Systems, Inc. for the best service. When the weather's freezing, we'll repair your furnace 24 hours a day. Our highly skilled technicians provide top notch customer service; plus if your heating or cooling system is under a manufacturer warranty or guarantee — we'll honor it. We offer maintenance programs too. Call today.

Your Manufacturer Guarantee is Honored Here

"Thank you for your prompt attention and follow up to our heating opportunities. Ben was great and was able to make a lot of improvements."

- Lyn Ecbert

  • Water heaters

  • Thermostats and zone systems

  • Radiant heat repair and maintenance

  • Radiant heat installation and replacement

  • Oil to gas conversions

  • Oil furnaces

  • New technology (lower fuel costs)

  • Maintenance

  • Hybrid heating systems

  • Heating repair and maintenance

  • Heating installation and replacement

The weather inside is wonderful with a well-maintained heater

We Honor All Major Manufacturer Warranties.


  • Heat pump repair

  • Heat pump maintenance

  • Heat pump installation and replacement

  • Geothermal systems

  • Gas furnaces

  • Furnace repair and maintenance

  • Furnace installation and replacement

  • Very efficient systems

  • Ductless mini split systems

  • Boiler repair and maintenance

  • Boiler installation and replacement