Air Conditioning Companies in Upper Marlboro, MD

Comprehensive list of commercial and residential air conditioning companies in Upper Marlboro, MD offering installation, repair and maintenance services.

Business Listings

Horizon Mechanical Services LLC is a commercial air conditioning, controls, and heating service establishment founded in 2001. We specialize in service, commissioning and repair of Trane, Aaon, York, and McQuay plus many more equiment manufacturers. We provide annual, quarterly, and/or monthly service of central building equipment such as cooling towers, boilers, chillers, rootp air conditioning equipment

  • Hello! *Background* I live in a 8 story, high-rise condo in DC. My unit is equip with

Since 1962, I have worked to supply the community with quality service that you can trust. I started working part-time in the field through high school, and then full time in 1955. In 1974, I purchased Golden Service and merged it with the existing Bob Baker's Heating and Air Conditioning.

  • Get the numbers up front, deceptive talk and billing.

J&P has its own sheet metal shop, so we can economically fabricate any ductwork that a job requires and install that ductwork speedily and efficiently. From comprehensive service maintenance contracts to periodic service calls. J&P has the expertise to answer any and all heating and air conditioning questions. You deserve the highest service for your home!



A woman managed and owned firm. W elcome to Belair Engineering Online! No money down, easy financing is available!


JCM pursues trustworthy relationships as the means to our success. JCM reflects a workforce rich in knowledge, knowledge and leadership. By committing to the best standards of craftsmanship and achieving award winning service, JCM is a preferred business partner by Owners, General Contractors, Engineers, Subcontractors and Suppliers.


Thank you for your interest in our air conditioning & heating services. Through commitment to our clients and our commitment to quality, we believe that we can give you the highest service in our industry. Please take a moment to browse through our site to learn more about our firm and the services that we can supply you. If you have any comments or questions, please feel free to call us.

  • Friendly staff, came on time and I love that they were able to beat the price of my first