Professional HVAC Services in Maryland

GreenDena is a high efficiency heating and cooling company located in Pasadena, MD. We provide services throughout Anne Arundel County including Pasadena, Glen Burnie, Severna Park, Arnold, Annapolis, Millersville and surrounding areas. Our goal is providing customer-focused service from technicians that are prompt, professional and thoroughly trained. We can handle any job, big or small, requiring a new install of heat pump or air conditioning units, duct work installation and cleaning or repairs to existing heating and cooling equipment that is no longer functioning properly. GreenDena installs only the best new equipment from the most reliable manufacturers to insure long lasting performance.

Our goal is to be the go-to company whenever an HVAC service is needed. Our regular maintenance plan will help to keep your heating and cooling units operating at peak efficiency and extend the life of the equipment.

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Residential Commercial Maintenance


GreenDena understands that your heating and air conditioning system is responsible for providing a comfortable climate regardless of the season. When you need heating or AC repairs, you need them now. Should you be facing a challenge with your heating or cooling units, contact us by calling 410-255-5200. We look forward to meeting your needs!

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  • Very happy with the service and equipment. They were able to install my whole house humidifier 2 days after we agreed on the contract. Would recommend to friends.

    - Severna Park, MD

  • Greg at GreenDena is about the nicest guy you could meet. He is an expert on HVAC systems and has done a wonderful job on my retail space. As soon as you meet Greg, you feel at ease that he is someone you can trust and who will do a great job.

    - Mark M. Severna Park, MD

  • GreenDena is one of the best contractors I have ever worked with in terms of competence, efficiency in installation, promptness, courteousness, and they had the best price.

    - R K. in Arnold, MD