Commercial HVAC Service & Repair


Commercial heating and air conditioning systems serve a vital role in facilitating normal business operations and maintaining a comfortable indoor environment. Over one-third of a company’s total monthly power consumption can be attributed to the operation of the HVAC system. Facilities administrators and business owners recognize the importance of choosing a contractor with a strong background in every phase of the commercial air conditioning and heating industry.


Light commercial systems usually range from 5-15 tons in total output capacity. Unlike residential applications, the heating and cooling load can fluctuate significantly depending on the nature of the business. Manufacturing and IT facilities usually generate a substantial amount of process heat. Retail and food service companies have varying occupancy rates and periodic disruptions in the external air barrier.

To ensure that the load requirements are satisfied during the most extreme conditions, it is vital that the HVAC contractor assembles a comprehensive set of load calculations for the entire building and each partitioned area.

At Gilman Heating, Cooling & Plumbing, our designers engineer every system according to ACCA Manual J standards. These complex calculations account for a variety of energy consumption factors including:

  • Projected occupancy rate
  • Insulation value of walls and ceiling
  • Process generated heat
  • Perimeter tightness
  • Windows and doors
  • Duct leakage
  • Local climate history

Once the total load has been established, our designers will match the capacity of the equipment to meet the most extreme anticipated demand. This will ensure that the system operates efficiently while providing an elevated level of indoor comfort.


In the business environment, every commercial air conditioning and heating malfunction is an urgent situation. When the indoor environment is uncomfortable, productivity can suffer and sales opportunities may be lost. For industries with rigid temperature and humidity specifications, an unexpected equipment failure can be catastrophic.

We understand the importance of answering every service inquiry promptly and dispatching a technician in a timely manner. We allocate significant resources to service, so we can address multiple jobs simultaneously.

On the jobsite, our technicians use advanced tools and equipment to locate the cause of the failure and rapidly restore the system to full functionality.

To help avoid the potential for an unexpected breakdown, we recommend a commercial heating and air conditioning maintenance agreement. Preventive maintenance can improve system efficiency and help identify small problems before they affect equipment performance.


In new construction or retrofit applications, a commercial heating and AC contractor must adhere to the construction schedule and coordinate directly with the general contractor. During the rough-in phase of the job, our field mechanics install the air distribution system according to ASHRAE 90.1 and UL 181 standards. After the equipment is set, the system is charged with refrigerant, and we run several tests to verify it is performing to the manufacturer’s specifications. Economizers and make-up air units are adjusted for optimal performance, and the diffusers are air balanced.

Complete Commercial HVAC Services

Gilman Heating, Cooling & Plumbing has served the business community in Virginia since 1917. We provide a wide selection of commercial HVAC services designed to improve indoor comfort, lower utility costs and extend the lifecycle of the equipment.


Customer Feedback

  • Erin Hedrick, Nov 12, 2022

    Fixed shower pressure and temperature. They were early and came in solved the problem and were very friendly and super efficient!

  • Wayne Settle, Nov 23, 2022

    Kristian and Noah searched for a plumbing problem that was affecting the water supply to my freezer ice maker. After a thorough search and inspection of the water line, they determined the cause to be with filter installed in the refrigerator. They were quick and very professional. I whole heartedly recommend the team at Gilman’s Heating/Air/Plumbing.

  • William Sprake, Dec 1, 2022

    Problem resolved without issue. Highly recommend Gilman Heating, Cooling & Plumbing!

  • Lenny G, Dec 2, 2022

    Chris has been here a few times for plumbing projects, and always does a great job. Gilman does a great job for our plumbing and hvac work, and we know we can trust them with our home.

  • D S, Nov 18, 2022

    Chris and Preston came to do lots of plumbing work. Install kitchen faucet and garbage disposal, replace sink pipes and replace shower pipe -- all of which turned out to be more difficult than expected. All jobs were completed and I am happy with the work. You couldn't ask for two more pleasant and professional guys. Will definitely use Gilman and their employees again.

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