• We WILL provide the BEST service,
    the FIRST time, every TIME!

  • Delivering the professionalism you need
    and the workmanship you expect.

  • Family owned and operated small business
    intent on giving back to the community.

  • Servicing all types of heating and cooling
    systems for your home or business.
  • Residential

    We have 15 years of experience installing and maintaining heating and cooling systems, including services such as air conditioner and heat...

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  • Commercial

    Commercial HVAC is often more involved than residential heating and air conditioning. When it's not working, it not only causes discomfort...

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  • Maintenance

    Yearly Maintenance allows us to address minor heating and cooling issues that might cause strain to the unit and lead to an emergency repair...

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Welcome to GreenDena

High Efficiency Heating & Cooling in Maryland

With over 15 years of experience in Commercial and Residential HVAC, GreenDena, services Glen Burnie, Pasadena, Arnold and the surrounding area, and can meet all of your heating and cooling needs. We install heat pumps, oil furnaces and air conditioning units, as well as all of the necessary duct work, using only the best equipment from companies such as Trane, Rheem and Honeywell. We know that our customers rely on us to provide quality equipment, and we pay attention to heating and air conditioning unit performance over time, installing only those systems and parts that have been proven to last.

We install these preferred equipment lines:

However, GreenDena doesn't stop there. Based in Pasadena, MD, we maintain, service and repair heating and air conditioning systems throughout Maryland, whether they were installed by us or not. We have maintenance plans that include cleaning and regular inspections, insuring that your heating and cooling units work properly, ultimately bringing savings to the customer on the monthly utility bill.

GreenDena is committed to providing excellent customer service, with a constant on-call policy, and an understanding that your time is important when scheduling repairs or service. Should you have any HVAC need, or even a question regarding heating or cooling, call Greg at GreenDena. As the owner, he is involved in each job from start to finish to ensure our customers receive the quality service they deserve.

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  • 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

  • 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