Do Commercial HVAC Controls Have Title 24 Requirements?

Yes, extensively. Section 120.2 sets mandatory control requirements for nonresidential and hotel/motel buildings, and they apply regardless of which compliance path the project takes.

What Section 120.2 covers

A specific list rather than a general principle: thermostatic controls for each zone, criteria for zonal thermostatic controls, hotel and motel guest room thermostats, heat pump controls, shut-off and reset controls for space-conditioning systems, and automatic demand shed controls. Thermostat location itself is set by Section 120.2(a).

Because these are mandatory, they are not traded away on the performance path. A design that models well still has to meet them.

The exception worth knowing

Setback thermostat requirements do not apply to systems serving zones that must hold a constant temperature to protect a process or a product — a laboratory or a museum being the stated examples. That is a genuine exception with a genuine justification, not a general escape for anything inconvenient to set back.

VAV systems follow Guideline 36

For variable-air-volume systems the prescriptive requirements follow ASHRAE Guideline 36, which brings a defined control sequence: static pressure setpoint reset, zone controls with direct digital control, an air economizer under DDC, and supply air temperature reset.

That is a materially more sophisticated controls scope than a single-zone rooftop, and it is the reason a VAV retrofit is a controls project as much as an equipment one.

Demand responsive controls

Table D-1 in Appendix D of the standards sets out when demand responsive controls are required in nonresidential buildings. On a zoned system, enabling demand response in practice means a network adapter for each controlled room, monitored and controlled by an energy management control system.

Controls are tested, not just specified

Mechanical acceptance testing covers controls as well as equipment — the energy management control system test verifies occupancy sensors are tied into both lighting and HVAC. So the controls narrative has to hold together across two trades, and it is verified on site by a certified technician before the permit closes.