• Residential

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

    Read More
  • Commercial

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

    Read More
  • 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...

    Read More


High Efficiency Heating & Cooling in Maryland

With over 18 years of experience in Commercial and Residential HVAC, GreenDena, services Pasadena, Glen Burnie, Severna Park, Arnold, Annapolis, Millersville, and the surrounding areas, and can meet all of your heating and cooling needs. We install heat pumps, furnaces and air conditioning units, as well as all of the necessary duct work, using only the best equipment from companies such as Trane and Mitsubishi. 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.

Based in Pasadena, MD, we maintain, service and repair heating and air conditioning systems throughout Anne Arundel County, 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 you on your monthly utility bill.

GreenDena is committed to providing excellent customer service and 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 us at GreenDena today. 

Savings & Coupons

Service Request

Free Estimates

  • 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

  • The owner was polite, professional and on time. He beat all the other estimates and completed the work early in addition to arranging the county Inspector the next day. Truly it was the most pleasant experience I've ever had with a contractor.

    - Donald C. in Glen Burnie, 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