ASHRAE 90.1 — Energy Standard for Buildings

ASHRAE 90.1 (Energy Standard for Buildings Except Low-Rise Residential Buildings) is the primary energy efficiency standard in the United States. Published by the American Society of Heating, Refrigerating and Air-Conditioning Engineers, it sets mandatory minimum energy requirements for building design, construction, and operation.

What makes ASHRAE 90.1 increasingly relevant to AV integrators is that it now explicitly addresses display equipment energy consumption, standby power limits, and occupancy-based control—areas directly under AV system management. Unlike older versions, ASHRAE 90.1 (2022 edition and later) treats AV and audiovisual systems as "plug loads" subject to energy mandates.

Why It Matters: Many states have adopted ASHRAE 90.1 into their building codes. In Colorado, for example, ASHRAE 90.1-2016 became mandatory in 2020; ASHRAE 90.1-2022 adoption is progressing. Violating energy codes can delay project occupancy permits, result in fines, and expose you to liability for non-compliant installations.

Authority: American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)
Website: https://www.ashrae.org/technical-resources/standards-and-codes

Lighting Control & Occupancy Sensors

ASHRAE 90.1 mandates automated lighting control in most spaces. For AV integrators, this means integrating with—or avoiding interference with—occupancy-based lighting systems.

Key Requirements:

• Occupancy sensors required in enclosed offices, conference rooms, break rooms, and storage areas
• Automatic shutoff required in spaces after 30 minutes of vacancy (20 minutes in restrooms)
• Daylight harvesting required in spaces with windows; photosensors adjust lighting based on available natural light
• Manual override permitted, but auto-shutoff must re-engage after 2 hours

AV Impact:

• Video displays and monitoring screens interfere with daylight sensors (they emit light that photosensors read as "sufficient daylight")
• Conference room scheduling systems (Crestron, Q-SYS, Cisco) must integrate with occupancy sensors to prevent lighting shutoff during meetings
• Dark rooms for presentations require manual override of daylight harvesting; ensure your control system can disable photosensors during video playback
• LED video walls and displays draw substantial power; any savings from occupancy shutoff can be negated if displays run idle

Display & AV Equipment Energy Consumption

ASHRAE 90.1-2022 introduces explicit limits on plug load energy consumption—the category under which AV equipment falls.

Standby Power Limits:

• Equipment in "off" or "standby" mode must not exceed 0.5W if the equipment has no active display, or 1.5W if it has a display (e.g., a powered amplifier with a status screen)
• Network-connected equipment (Crestron processors, media servers, edge devices) may exceed this if required for wake-on-LAN or network monitoring, but must be documented and justified
• Applies to: Amplifiers, media servers, control processors, AV receivers, digital signage media players, microphone base stations

Display Power Limits:

• Displays larger than 30 inches must meet energy consumption targets based on screen size and luminance
• Sleep mode required: Displays must drop to below 1W standby power after 30 minutes of inactivity (or per default manufacturer settings)
• Brightness adjustment: Displays must support brightness scaling (dimming) and be calibrated to not exceed average target luminance levels

AV-Specific Implication:

A conference room video wall with four 55-inch displays cannot simply be powered on 24/7. Your control system must schedule automatic shutoff, or your installation violates ASHRAE 90.1. If the client demands always-on displays (e.g., for digital signage), you must justify the exception and document it in the commissioning report.

Equipment Room Cooling & HVAC

ASHRAE 90.1 regulates the conditioning of spaces containing AV and IT equipment.

• Equipment room cooling must be designed per ASHRAE 90.1 Section 6.5.2: setpoint not lower than 75°F (24°C) during occupied hours
• Hot/cold aisle containment reduces unnecessary AC conditioning; if your rack layout uses hot aisle containment, the HVAC load can be reduced
• Free cooling (economizers, air-side or water-side) must be used when outdoor air conditions permit

AV-Specific Implication:

Your video wall amplifiers and media servers generate heat. If the equipment room is cooled to 68°F (oversized for comfort), you're wasting energy. Design your rack layout with proper ventilation; thermal monitoring (via control system sensors) helps validate ASHRAE 90.1 compliance.

Power Management & Control System Integration

ASHRAE 90.1 requires that plug loads (AV equipment) be controllable via the building management system or through occupancy-based scheduling.

Requirements:

• Scheduled shutoff: Equipment must power down during unoccupied hours (set via occupancy sensors or building schedule)
• Manual override: Users must be able to reactivate equipment, but automatic shutoff re-engages after a defined period
• Monitoring and reporting: Energy consumption must be trackable (for verification and LEED documentation)

AV Control System Integration:

• Crestron, Q-SYS, AMX systems can integrate with building occupancy sensors, calendar systems, and BMS to automate AV shutoff
• Example: Conference room video wall stays dark until a meeting is scheduled or motion is detected; after 30 minutes of vacancy, it powers down automatically
• Data trending: Your control system should log power consumption for audit and compliance verification

Relationship to LEED, IBC, and State Energy Codes

ASHRAE 90.1 is referenced by:

• LEED v4.1: EAc1 (Optimize Energy Performance) requires ASHRAE 90.1 compliance as a baseline
• IBC (International Building Code): Section 502 adopts ASHRAE 90.1 by reference
• State energy codes: Most states adopt ASHRAE 90.1 (sometimes with amendments) as their building energy code

Colorado Specifics:

• Colorado Code (based on IBC 2021) requires ASHRAE 90.1-2016 compliance
• Recent amendments are moving toward ASHRAE 90.1-2022 adoption
• Check with local AHJ (Authority Having Jurisdiction) to confirm current adopted version

Common Pitfalls

1. "The client wants displays always on" — Always-on installations violate ASHRAE 90.1 unless explicitly approved and justified. Document client requests for non-compliance in writing, and work with them to find a compromise (e.g., display wakes on motion/schedule, but runs dim during off-hours).

2. Ignoring display calibration — A video wall at maximum brightness consumes 2x the energy of one at 50% brightness. Proper calibration and scheduling reduce energy use without visible quality loss.

3. Equipment room cooling overkill — Don't default to oversized AC units "just to be safe." Size HVAC per actual equipment heat load and ASHRAE 90.1 setpoints. Monitor thermal performance post-commissioning.

4. Forgetting standby power limits — A $5,000 conference room AV system might fail energy code due to one amplifier in permanent standby mode drawing 5W. Verify all equipment meets 0.5W–1.5W standby limits before installation.