Are you searching for a highly reliable Heating & Air Conditioning company in Northern Virginia? Our highly experienced HVAC engineering team offers outstanding heating & air conditioning services to our customers. Our master HVAC engineer, with his team of technicians and installers, has a proven track record of providing high quality service with over 36 years of combined experience!

Air Conditioning

It can be rather difficult to stay comfortable in the hot and humid Virginia climate. That is exactly why we are here to assist you. Do you find your air conditioning system not performing on those sweltering summer afternoons? Are there strange sounds being echoed throughout your residence? Has the unit iced-up? Are there strange puddles of water forming around your system? These issues cannot be expected to fix themselves so please allow us to help. Keeping you cool during the brutally hot summer is what we do and we do this exceptionally well. Repairs, installations/replacements, and maintenance, from heat pumps to centralized air conditioning systems, we are here to service your cooling needs.


When it comes time to fire up the heating system and taking the edge off those chilly times, we have you covered like a cozy warm blanket. Even basic gas-fired furnaces have numerous safeties and with the latest highly-efficient units having an even more sensitive setup, this is exactly why annual maintenance is strongly suggested. Should you find that the system does not live up to your expectations, it is time to call a professional. It is time to call us, MJA Design. Repairs, installations/replacements, and maintenance, from heat pumps to centralized gas-fired furnace systems we are here to service your heating needs.

Specialty Hybrid HVAC Systems

During the transitional times of the year (spring and autumn), we do not need the full power of a traditional gas-fired system to take the mild chill out of the air. This is exactly why hybrid systems are so ideal. They automatically select the most economical fuel source at a chosen ambient temperature set-point. Also, the efficiency/comfort may be further enhanced by multi-stage and even variably staged inverter systems. With the efficiency that rivals that of a Toyota Prius, these hybrid heating/cooling systems for your home should not be overlooked. Please inquire about these systems today to see if they fit your needs.

Indoor Air Quality

Do you or a loved one suffer from allergies, respiratory conditions, or just want fresh and clean air circulating throughout your home? We provide countless filtration, humidification, and fresh air systems to assist in your personal comfort. Having a great filtration system combined with a particulate removal will reduce odors, air pollutants, VOC's (chemical odors), smoke, bacteria, organic growth, and viruses. Installing indoor air quality products will leave you feeling refreshed. Why not feel comfortable in your own home and stop your sniffling and sneezing?

Zoning Systems

Do all of your rooms cool and heat evenly or are some areas better than others? Many homes have only one centralized HVAC system, but would greatly benefit from adding multiple zones. Adding zones to an existing system may be your ticket to whole-house comfort. Zoning aids in alleviating the temperature differentiation while significantly increasing all-around comfort and decreasing energy consumption.