How General Contractors Can Help Prevent HVAC Failures
As a general contractor, you aren’t running load calculations or fabricating sheet metal ductwork.
To handle those jobs, you hire mechanical contractors—like the experts found in our Bryant Colorado network of local HVAC dealers. They stay hands-on with design and installation while you review the blueprints and keep the project on schedule.
You are the ultimate orchestrator. If something goes wrong with the HVAC—it underperforms or is installed without maintenance access—the buck stops at your desk, not with the subcontractors.
Why HVAC Mistakes Occur in New Construction
In commercial construction, HVAC mistakes happen because job site coordination breaks down, design changes occur mid-project, or different subcontractors compete for the same space to run their wiring, ductwork, pipes, beams, and joists.
You need to know how to manage the process to prevent costly field errors. Here are four common commercial HVAC installation mistakes and how general contractors can avoid them.
Mid-Project Construction Changes Can Affect HVAC Sizing
Mechanical engineers size commercial systems based on specific architectural variables. If the building envelope changes after the engineering phase, the pre-ordered equipment will instantly be incorrectly sized.
Changing the Building Envelope
Establish a hard deadline after which insulation R-values, window glass specifications, and roofing materials cannot be changed without an official HVAC engineering re-evaluation.
Changing Tenant Spaces
If a tenant space changes its intended use mid-build, it will likely affect the HVAC design. For example, if space planned for a boutique clothing store becomes a restaurant, HVAC plans will change. A restaurant has more occupancy and heat loads than a clothing boutique, requiring an immediate HVAC redesign.
Dealing With Airflow and Duct Restrictions in the Ceiling
HVAC installers, plumbers, and electricians fight for the same overhead space in congested plenum spaces. When coordination breaks down, the trade that arrives first takes the best path.
If it’s not the sheet metal crew, those installers will be forced to create sharp, unapproved 90-degree bends to route ducts around pipes, throwing off the system’s static pressure.
Mandate a Meeting to Resolve Clashes Between Trades
Don’t allow crews to fabricate or install materials until you hold a 3D Building Information Modeling (BIM) meeting where you will identify and resolve conflicts before installation begins.
Each trade develops a 3D model showing installation plans. By merging the models into a single virtual platform, you can identify areas where work conflicts require design modifications. Once the model is clash-free, fabrication and installation can begin. This planning method prevents job delays and expensive mistakes.
ACHR News, citing a study by Dodge Construction Network, reports that BIM reduces waste by 50 percent and improves installation quality while reducing errors by 36 percent.
Create a Hierarchy of Work That Is Competing for Space
Establish clear rules in the contract documents. Typically, large, inflexible ductwork takes spatial priority over flexible conduit and smaller plumbing lines.
Inadvertently Blocking Maintenance Access for HVAC
An engineer may design enough clearance around Variable Air Volume (VAV) boxes, fire dampers, and fan coil units, but a framing and drywall crew with no knowledge of the mechanical layout can easily build over critical maintenance points.
Ensure Drywall Won’t Eclipse Maintenance Access
Walk the site with your mechanical contractor before crews are allowed to hang drywall. Verify that all access doors, filter racks, and control valves have the clearance required by local mechanical codes.
Mark HVAC Maintenance Access Points Early
Mark the exact locations of ceiling access panels directly on the framing so the drywall crew can create the necessary openings.
Don’t Let Dust Ruin a New HVAC Unit
Construction creates massive amounts of drywall dust and concrete grit. Still, subcontractors often want to turn on the building’s permanent commercial HVAC system early to keep themselves warm or cool while finishing the building.
If the system runs during drywall sanding or concrete cutting, massive amounts of fine dust will flood the brand-new equipment, ruining the blowers and clogging the coils before the owner even takes the keys.
Enforce Strict Air Quality Protocols
Keep the permanent Bryant equipment turned off during heavy dust-producing phases. Rely on dedicated, temporary heating or cooling units instead.
Keep Dust Out of Ductwork
If you must turn the HVAC system on before the building is complete, ask the HVAC crew to temporarily use filters with a high Minimum Efficiency Reporting Value (MERV) rating and replace them daily. Seal return air registers with plastic duct vent masking film.
Work With a Trusted Commercial Bryant Dealer
You can avoid commercial HVAC failures by partnering with professionals who do it right the first time. You need a mechanical partner tailored to your specific project delivery method.
Whether you need a full design-build mechanical contractor to engineer your system from scratch, a commercial installation specialist to execute your complex blueprints, or a certified technician to commission your building’s equipment, the right team is nearby.
Explore our Bryant Colorado dealer directory today to connect with commercial-grade HVAC professionals in your region.