Hybrid Cooling With HVLS Fans: Reducing Energy Use in Singapore Facilities

If you manage a large commercial or industrial building in Singapore, energy performance is probably not just a sustainability goal on a slide deck. Depending on your building's size, it may already be something you report annually, and increasingly, something you can be required to act on.

This is written for facility managers, sustainability leads and building owners looking for a genuine, standards-recognised way to reduce cooling-related energy use, not another vague efficiency buzzword. Hybrid cooling, paired with the right HVLS fans, is exactly that.

The Real Obligation Behind "Energy Efficiency" in Singapore Buildings

Since 2013, owners of commercial buildings with a gross floor area of 5,000 square metres or more, including offices, hotels, retail buildings and mixed developments, have been required to submit annual building information and energy consumption data to the Building and Construction Authority. This data feeds into Energy Use Intensity, or EUI, a benchmark calculated by dividing a building's total annual electricity consumption by its gross floor area, which allows BCA to compare a building's performance against similar buildings.

This stopped being purely informational in September 2024, when BCA announced the Mandatory Energy Improvement regime. Under this regime, buildings that consistently rank among the worst 25 percent over multiple reporting years for EUI in their category are required to engage a Professional Engineer or a BCA-registered energy auditor, conduct a formal energy audit, and develop an Energy Efficiency Improvement Plan that reduces EUI by at least 10 percent from pre-audit levels, with those measures implemented within three years.

On top of this, building cooling systems specifically are already subject to mandatory periodic energy audits under the Code on Periodic Energy Audit of Building Cooling System, precisely because cooling is typically the single largest energy draw in a Singapore commercial building. If your building has not yet received a notice, this is still worth understanding now rather than after one arrives.

Where Hybrid Cooling Fits Into an Energy Efficiency Improvement Plan

Hybrid cooling is a specific, BCA-recognised strategy under Green Mark's technical guidance for existing non-residential buildings. It involves raising the air conditioning temperature setpoint while adding elevated air speed through large fans, so occupants experience the same comfort at a higher, less energy-intensive temperature. The underlying reason this works is simple. Moving air increases how quickly the body loses heat through both convection and evaporation, which is why a slightly warmer room with good airflow can feel just as comfortable as a cooler, still one.

For a building facing an EUI improvement target, this matters because it is a genuine, auditable lever, not a soft commitment. Reducing chiller and air handling unit runtime by raising the setpoint, while maintaining occupant comfort through proper air movement, is exactly the kind of measure that can plausibly contribute to a required EUI reduction.

Why HVLS Fans Specifically Suit Large Commercial and Industrial Spaces

Small, high-speed fans move air in a narrow, turbulent stream that dissipates quickly, which is why they only really help the person standing directly beneath them. A high-volume, low-speed fan works completely differently. A large-diameter fan rotating slowly pushes a broad, steady column of air down to the floor, where it spreads outward across the entire space as what is sometimes called a floor jet, before circulating back up and around.

There is also a less obvious benefit that matters in Singapore specifically, even without a winter to justify it. In buildings with high ceilings, warehouses, factories, large retail floors and hangars, among them, warm air still rises and pools near the roof. That trapped heat radiates back down and adds to the cooling load your air conditioning has to work against. Continuous, gentle mixing from an HVLS fan prevents that stratified heat buildup, which eases strain on your cooling system independent of any thermostat change at all.

Real Singapore Examples of Hybrid Cooling in Commercial Buildings

This approach is already proven at exactly the scale this audience operates at. Singapore Management University's Administration Building, part of a BCA Green Mark version 7 pilot that also achieved the Super Low Energy 60 rating, uses hybrid cooling to maintain comfort at 25.5°C to 26°C, well above many conventional commercial setpoints.

NUS School of Design and Environment 4, a Green Mark Platinum Zero Energy building, runs a hybrid cooling system combining pre-cooled fresh air with ceiling fans at 27°C. Both are large, professionally managed, publicly certified non-residential buildings, which means this is not an unproven idea being pitched to you. It is a measured, audited outcome already achieved in Singapore's own climate and regulatory environment.

For context on the scale of opportunity here, BCA's own building energy benchmarking data shows the overall EUI across Singapore's reporting building stock has fallen meaningfully since national benchmarking began, evidence that building-level efficiency measures, cooling strategy very much included, do move the national number over time.

What This Looks Like in Practice: HVLS Plus Your Existing HVAC

Hybrid cooling with HVLS fans is not about ripping out your air conditioning. It is about giving your existing system less work to do. Our HVLS fans are engineered specifically for this kind of continuous commercial duty. The flagship Powerfoil X4 uses a NitroSeal gearbox designed to run reliably for years without routine oil changes, and includes eight redundant safety features and a heavy-duty mounting system, which matters when a fan of this scale is operating above an occupied floor.

On the control side, every fan comes with a touchscreen controller, and the BAFCon upgrade adds SmartSense technology, which adjusts fan speed automatically based on actual room temperature. Paired with CommandSense, your fans, your HVAC and your building sensors can operate as one coordinated system rather than requiring someone to manually manage two separate pieces of equipment.

Where Big Ass Fans Fits Into A Hybrid Cooling Strategy

Hybrid cooling depends on more than simply installing a fan. The quality, consistency and coverage of airflow all influence how effectively a facility can maintain comfort while operating at a higher air-con setpoint.

• Powerfoil X4 is our flagship HVLS fan, designed for large industrial environments where maximum airflow coverage, occupant comfort and long-term reliability are critical.

• Powerfoil D combines HVLS performance with a direct-drive platform, making it a strong choice for facilities prioritising simplified maintenance and operational reliability.

• Powerfoil 6 is engineered for facilities seeking industrial-grade airflow performance in a practical and cost-effective package.

• Essence is designed for commercial and light-industrial applications where aesthetics, comfort and energy performance are equally important.

If you are unsure which fits your facility, the team at Big Ass Fans Singapore can assess your space directly rather than have you guess from a spec sheet alone.

The Case for Acting Before You're Told To

The Mandatory Energy Improvement regime targets the worst-performing quarter of buildings first, which means the buildings that act early are, by definition, not the ones that get caught in that first wave. Waiting until a notice arrives means working to someone else's timeline, with a fixed 10 percent reduction target and a three-year clock already running.

Hybrid cooling with a properly specified HVLS fan is one of the more straightforward measures available to a facility manager, precisely because it does not require replacing your cooling system, only giving it less work to do. If you would like to understand what this could mean for your building's EUI, you are welcome to get a quote from our team.

Frequently Asked Questions

1. What buildings in Singapore must report their energy use intensity?

Commercial buildings with a gross floor area of 5,000 square metres or more, including offices, hotels, retail buildings and mixed developments, have been required to submit annual energy consumption data to BCA since 2013, forming the basis of national EUI benchmarks.

2. Can HVLS fans help a building meet Singapore's Mandatory Energy Improvement requirements?

They can be part of the solution. Hybrid cooling, pairing elevated air movement from HVLS fans with a higher air conditioning setpoint, is a BCA-recognised strategy that reduces cooling system runtime while maintaining comfort, making it a plausible contributor to the EUI reduction required under an Energy Efficiency Improvement Plan.

3. Do HVLS fans work in air-conditioned spaces, or only in naturally ventilated ones?

They work well in both, and are commonly used specifically alongside air conditioning as part of hybrid cooling. The moving air lets occupants feel comfortable at a higher, less energy-intensive setpoint, rather than the fan replacing the air conditioning entirely.

4. How many HVLS fans does a warehouse or factory typically need?

This depends on ceiling height, floor area and how the space is used, so there is no single standard figure that applies to every facility. A proper site assessment is the most reliable way to determine fan count and placement for a specific building.

5. Is hybrid cooling with HVLS fans suitable for humid, high-ceiling industrial spaces?

Yes. High-ceiling spaces are actually where HVLS fans tend to add the most value, since warm air naturally rises and pools near the roof in these buildings. Continuous air movement prevents that heat from building up and radiating back down, which helps even before any change is made to the air conditioning setpoint.