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Your Trusted HVAC Partner in Connecticut
Osa Heating & Cooling is a locally owned and operated business with over 65 years of combined experience in the HVAC industry. 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 solutions, and ductwork services. Our versatility ensures we can meet any residential or commercial heating and cooling requirement while maintaining a commitment to unparalleled service in Lower Fairfield and New Haven Counties. Training at OSA is intensive and ongoing, ensuring prompt and efficient service delivered with professionalism on the first visit.

Our trained specialists are dispatched from our local office and are always just a phone call away, guaranteeing immediate responses to all situations. We specialize in central air conditioning repairs and installation, with preventative maintenance programs designed to keep systems operating efficiently. Contractors can submit project bids to our team, which responds within one business day. Our dedication to quality, combined with decades of expertise, positions us as a trusted partner for all HVAC needs in Connecticut.
Services
Furnace Installation Boiler Repair Heat Pump Services Air Conditioning Maintenance Ductwork Repair Indoor Air Quality Solutions Preventive Maintenance Programs Oil to Gas Conversion
Highlights and features
  • We offer over 65 years of combined HVAC industry experience.
  • Locally owned with dedicated service in Lower Fairfield and New Haven Counties.
  • Our specialists provide prompt, professional HVAC solutions.
  • Comprehensive services for residential and commercial heating/cooling needs.
  • Ongoing training ensures top-tier HVAC proficiency.
Services
Furnace Installation
We provide professional furnace installation services for residential and commercial properties. Our certified technicians ensure proper sizing, efficient operation, and compliance with local building codes. With extensive experience across all major brands, we deliver reliable heating solutions tailored to your specific needs and energy efficiency goals.
Air Conditioning Maintenance
Our preventative maintenance programs keep air conditioning systems operating at peak efficiency. Services include filter replacement, refrigerant checks, coil cleaning, and system diagnostics. Regular maintenance extends equipment lifespan while ensuring optimal cooling performance during peak summer months in Connecticut.
Indoor Air Quality Solutions
We offer comprehensive indoor air quality assessments and solutions including HEPA filtration upgrades, UV light systems, and dehumidifier installations. These services improve respiratory health, reduce allergens, and create more comfortable living environments through cleaner, better-circulated air.
Oil to Gas Conversion
We specialize in converting oil-based heating systems to natural gas. This service includes system assessment, permitting assistance, and complete installation of new gas-fired equipment. Conversions typically reduce heating costs by 30-50% while providing more consistent temperature control and lower maintenance requirements.
Ductwork Repair
Our ductwork specialists identify and repair leaks, blockages, and inefficiencies in HVAC distribution systems. Services include duct sealing, insulation upgrades, and complete system redesigns. Properly maintained ductwork improves energy efficiency by up to 20% and ensures even temperature distribution throughout your property.
Questions
What HVAC services do you offer?
We provide furnace and boiler installation, air conditioning repair, ductwork services, indoor air quality solutions, oil-to-gas conversions, and preventative maintenance programs for residential and commercial clients.
Do you offer financing options?
Yes, we provide financing on all HVAC projects with 18 months same-as-cash options available to qualified customers.
What areas do you service?
We serve all of Lower Fairfield County and New Haven County in Connecticut.
Are emergency repairs available?
Our specialists are dispatched from our local office and available for urgent HVAC issues during regular business hours.
How do I schedule service?
Call us at (203) 338-0371 or use our online contact form to schedule appointments or request free in-home estimates.