Los Angeles Commercial HVAC

Common HVAC Challenges in 5-Story Buildings

These types of structures introduce airflow, pressure, and zoning challenges that must be accounted for during design, service, and long-term maintenance. Addressing factors like these proactively helps reduce operational strain and improve occupant comfort across all levels…

The Stack Effect and Pressure Imbalances

In 5-story structures, warm air naturally rises through stairwells, elevator shafts, and utility chases, creating pressure differences between floors. Ground-level spaces often experience drafts and infiltration, while upper floors may feel stagnant or overheated. When HVAC systems are not adjusted to compensate for this movement, upper-floor fans work harder to overcome rising heat, contributing to uneven wear and inconsistent comfort.

Vertical Static Pressure and Lift

Many mid-rise buildings rely on rooftop units to distribute conditioned air downward through the structure. Overcoming vertical static pressure is vital to maintain consistent airflow on lower floors. Without properly sized equipment and controls, lower levels may receive insufficient circulation while upper floors experience excessive air velocity and noise.

Zoning for Mixed-Use Vertical Layouts

A 5-story building frequently houses multiple tenant types, each with unique thermal demands. A ground-floor lobby with large glass surfaces behaves very differently than a fifth-floor fitness center generating internal heat. Designing a system capable of heating and cooling different floors simultaneously often requires advanced zoning that can shift energy where it is needed.