The Casteel Amazing Care


Your Choice for HVAC Services

Knight Air Conditioning and Heating, the trusted name in home comfort for Gwinnett County and surrounding areas since 1971, has merged with locally owned and operated Casteel Heating, Cooling, Plumbing, and Electrical. The new partnership will provide additional offerings and benefits to homeowners in the East Atlanta area.


Founded in 1971, Knight has delivered on its mission of professional service and high-quality installations for over forty-five years. As part of the Casteel family, the company will now be able to expand on its mission of high-quality service with added 24-hour availability, electrical and plumbing, in addition to exceptional air conditioning, and heating.


  • Quality Installations:
    • Commercial Installations
    • Residential Projects
  • Service and Repairs
    • 24 Hour Emergency Service
    • Knowledgeable, Courteous Technicians
    • Prompt, Professional Service
    • Maintenance Plans Available


  • Residential Systems
  • Commercial Systems
  • Duct Systems
  • Zoning Systems
  • Programmable Thermostats
  • Air Cleaners
  • Humidifiers
  • Dehumidifiers

When you need quick, quality HVAC services, we're your solution! Call us today (770) 766-1657 for fast, reliable HVAC services in your area!

Your comfort is our top priority!

What Our Customers Are Saying

30 Years of Exceptional Service
And Happy Customers

  • Honesty
  • Integrity
  • Professionalism
  • Amazing Care