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D&A Service Company delivers exceptional comfort for your home or business. Since 1981, our highly skilled technicians have built decades of experience providing exceptional HVAC maintenance, repair, and installation services for all your needs. We’re here for you 24/7 with emergency service, so you can always breathe easy knowing your home’s climate is under control.

Welcome to Gerleman Heating & Cooling, LLC! With over 15 years of experience, we are your go-to HVAC contractor in Branson, MO and the surrounding areas. Our team is EPA certified, licensed, and insured, ensuring that you receive top-quality service every time. We offer HVAC services to both residential and commercial properties, so you can trust us to keep you comfortable no matter where you are. Contact us today for any HVAC needs.

STULZ is a leading pioneer in the field of cooling and humidity control solutions for data centers and other mission critical applications. Our products are manufactured to the highest quality standards and in conformity with particularly stringent test criteria. Our energy efficient solutions are user-driven, custom-designed and purpose-built for mission critical applications. Your partner for climate control in North America STULZ USA designs, manufacturers and supports temperature and humidity controlled solutions for mission critical environments in North America. With a portfolio of precision air conditioning units, air handling units and ultrasonic humidifiers, STULZ is ready to support your application with a reliable and efficient solution. Together we achieve your goals It’s important for a company to not only find the best possible way to meet its customers’ needs, but also to understand their business. This is the only way to develop the best solution, customized to your application. You can count on us! Learn more about how we do business through our extensive sales network in the USA and Canada. From start-up to technical support, extended warranties to stocked spare parts, STULZ USA is here to help you with your cooling solution, 24/7/365.

Contemporary Air Systems, Inc. is Your Best Choice for AC and Heat Pump Repair in Essex and the surrounding areas. We live and breathe AC repair and installation in Harford and Baltimore County! We’ll not only install your new unit but also provide expert maintenance that will help it go the distance. Since heat pumps provide both heating and cooling, their life expectancy is less than that of an air conditioner or furnace. Is your heat pump on the brink of breaking down? Contact us for expert heat pump repair or replacement in the Dundalk or Middle River area. You depend on your heater to stay warm. Take care of it, and it will take care of you. Schedule heater maintenance yearly to replace bad parts before they cause a system meltdown. And, if you need to replace your heater in Harford and Baltimore County, we can help! Ductless mini-split systems are growing in popularity. They’re an efficient, flexible way to heat and cool your home. If that sounds like something you want, contact us for ductless mini-split installation or service in greater Essex. You'll be glad you did! Let us educate you. Whether you need furnace repair or full furnace replacement, we can help you make the right decision. We’ve installed residential gas furnaces and oil-fired furnaces in Essex and surrounding areas for over 31 years! We provide gas line services including gas leak detection, gas line repair, and pressure testing. If you smell gas, don’t ignore it! Call your utility company and then follow up with us—Harford and Baltimore County's gasfitting contractors. Contemporary Air Systems, Inc. opened to the public in 1993. In the 31 years since, we have proven ourselves to be an HVAC contractor homeowners in Essex and Dundalk can trust. Are you looking for a company that can quickly diagnose what is wrong with your furnace, air conditioner, heat pump, or heater? Has the smell of leaking gas got you on edge? Or maybe you need a gas pipe repaired, gas leak detected, or gas line pressure tested? Well, you've come to the right place. You can count on us for professional and expert HVAC services. Call us today to schedule an appointment for ac repair or replacement in Harford and Baltimore County.

AMERICAN TESTING, INC., founded in 1984, is an AABC/ACG Certified independent testing and balancing agency dedicated to providing professional personnel, expertise, and instrumentation to maximize HVAC system operations, efficiency, and performance. Pat Kelly, a founding father, began testing and balancing in 1967 alongside his father and brother-in-law. He served as an instructor for the Testing and Balancing Program at SMWIA Local 100, Baltimore, for ten years. An active member of the AABC since 1984, he was a Past President and chaired the committee that wrote the AABC National Standards for Total System Balance, the AABC Test and Balance Procedures, the AABC Training Manual, and was actively involved in the AABC Training Video Series. He served as a liaison between the SMWIA and the AABC and has published many articles and technical papers. Pat retired in April of 2008 to enjoy his beloved Chevy's and left his son and daughter to carry on his legacy. Pat passed away on February 9, 2018, due to heart failure. Christine Kelly, President, oversees all financial operations as well as field management. She has been an employee since 1985, when she began working afternoons and evenings with her Dad while attending college, creating data sheets, typing reports, job set up, and has grown with ATI to her present position. A graduate of the University of Maryland, College Park, and a SMWIA Local 100, Journeyman Test and Balance Technician, she is an experienced business owner who has worked from the ground up in the construction industry. Nicole Snyder, Project Manager, handles job setup, report review, payroll, instrumentation, job proposals. Nicole has grown with American Testing since 2008. She is well versed in Tab Opts, Blue Beam, BOX, and iSolved as well as overseeing our Continuing Education Division. She manages the progress and deadlines on all of our projects and provides communication to our clients through completion. Nicole is our key component in supporting all of our staff. Michael Kelly, Vice President, is an AABC Certified Test and Balance Engineer (TBE)/ACG Commissioning Agent (CxA) and a SMWIA Journeyman. He has been testing and balancing since 1987. Mike has also completed the training program on IAQ investigating and monitoring and is certified by the National Coalition on Indoor Air Quality as well as the Service and Start-Up course for Phoenix Controls and is fluent in DDC control systems. He has served on the Board of Directors for 12 years serving on various committees including revising the AABC TAB Training Manual, new member certification and is currently the immediate Past President for the Associated Air Balance Council (AABC). He is still currently serving as the Chairman of the SMWIA and AABC Training Committee. Jeremy Johnson, Operations Manager, manages scheduling, project plan review, and computer technology. An AABC Certified Test and Balance Engineer (TBE), ACG Certified Commissioning Technician (CxT) and a SMWIA Journeyman Test and Balance Technician, since April 2003. Jeremy is responsible for creating and updating our electronic reports and moving ATI toward a paperless TAB Agency. His vast knowledge has enabled our Technicians to create reports in the field for easier/faster submission to our clients providing up to the minute deficiencies to the client for faster completion of projects. Jeremy is currently serving as AABC Zone 1 Vice President as well as the Marketing Committee. All Technicians utilized by AMERICAN TESTING, INC., are AABC Certified Journeyman Testing and Balancing Technicians, who have participated in a four-year Sheet Metal Workers International Association (SMART) Comprehensive Testing and Balancing Program. To become certified, technicians must have at least four years of experience in the field and pass a rigorous written and practical exam.

Ac's Mechanical Services, Inc. has been in business since 2007. We provide services: commercial refrigeration, air conditioning, and heating, and any other projects related to the HVACR industry in Maryland, Virginia, Washington DC area, but can travel anywhere to satisfy our clients' needs. We service and install Hill Phoenix, Kysor Warren, and Hussman refrigeration cases and systems. Also, work on and install Danfoss, Emerson, Novar refrigeration controllers. We work on Carrier, Trane, Season 4, Munters HVAC systems. Our company provides maintenance, service and installation. We can do anything from the set up of a new store or remodel the existing store. Our mechanics are on calls 24/7. We are not satisfied until you are!

Since 1997 Air Safe, LLC. has provided certification and repair services related to the “Controlled Environment” industries including Hospitals, Pharmacies and Laboratories. We take great pride in being the most knowledgeable, professional, and adaptable service provider in the Midwest. With 20+ years combined in field experience there is no other company in the region that can offer you the quality, and reliability that Air Safe can. In an industry where every detail matters, you can rely on Air Safe’s experience and dedication to take care of all your service needs and stand behind it.

Clean Air Heating and Air Conditioning is a family owned and operated company that has served Marylanders since 1972. For over 45 years, your friends and neighbors have counted on our professional, no-nonsense approach to serving their residential and commercial heating and cooling needs. Whether you are remodeling, building a new home or replacing your existing system, you can depend on Clean Air Heating and Air Conditioning for efficient solutions that will keep you comfortable and help to reduce energy costs in your home or business. Choose Clean Air Heating and Air Conditioning for all of your interior comfort needs and be assured that you will get fair pricing, outstanding workmanship, superior customer service and prompt dependable service.

We're Not Comfortable Until You Are. Having AC Problems? Request Service. We're one of the premier heating & cooling companies in St. Louis, dedicated to serving our customers with the utmost quality in HVAC services for both residential and commercial entities alike. We strive to build a culture within our team that delivers the kind of heating and cooling experience you deserve when working with a service provider. The qualities that are most important to you, are most important to us - convenience, trustworthiness, good value, impeccable quality, and our willingness to stand behind our successes and learn from our mistakes. We invite you to explore our site, see what St. Louis customers say, and give us a call when you're ready to schedule your next heating and cooling service.