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On All HVAC Projects Big & Small.
18 months, same as cash



Professional heating & air conditioning services in Lower Fairfield & New Haven Counties

OSA Heating & Cooling has been in business for 20+ years. Our company’s number one priority is to offer superior heating and cooling installation, HVAC preventative maintenance, air conditioning and heating repairs, indoor air quality and duct work service.

Our versatility ensures that we are able to meet any of your residential or commercial heating and cooling requirements. We are dedicated to providing unparalleled service to all of our customers in Lower Fairfield and New Haven Counties. To meet the needs of our customers, training at OSA Heating and Cooling is an intensive and on-going process.

The end result is that you receive prompt and efficient service delivered with the utmost professionalism - the first time. That’s what sets OSA Heating & Cooling apart from our competitors.

Our trained specialists are dispatched from our local office, and are always just a phone call away. This ensures prompt, immediate responses to all situations.


  • Collecting permits for businesses and residents
  • Installation - Repair and service of every major brand
  • Personalized HVAC work
  • Estimations free of charge
Preventive Maintenance
Indoor Air Quality
Residential Heating & Cooling
Oil to Natural Gas Conversion

Areas we service

Technician checking compressor amps

6 Maintenance Tips to Prepare Your HVAC System for Spring

  1. Check your filters
  2. Get an air conditioning tune up
  3. Upgrade to HEPA filters
  4. Get a duct cleaning
  5. Get a dehumidifier
  6. Get UV lights


Our professional, highly trained HVAC Specialists can handle it all. Call (203) 338-0371 or fill out the form below if you have any questions or want to schedule an appointment.