Holiday Shutdowns and Indoor Air Quality
How to keep buildings fresh, safe, and energy-efficient over the Easter break
The Easter break offers a well-deserved rest for students and staff while leaving schools, offices, and commercial facilities largely unoccupied. As a result, facility managers and procurement leaders often see this period as an opportunity to reduce utility costs by scaling back building operations.
However, completely shutting down heating, ventilation, and air conditioning systems can lead to unintended consequences. In many cases, stagnant air, lingering odours, and microbial growth develop quickly, resulting in costly remediation and poor indoor air quality upon return.
This guide outlines the risks associated with low-occupancy buildings and provides practical strategies to maintain air hygiene, protect assets, and ensure a safe and healthy environment when operations resume. In addition, for a broader overview of solutions, explore BioZone air purification technology.
Jump to:
Risks of Stagnant Air | HVAC Strategy | Pre-Holiday Preparation | Post-Holiday Flush
Understand the Risks of Stagnant Air
Humidity and Microbial Growth
When airflow is reduced or stopped, indoor humidity levels can fluctuate. As a result, conditions become ideal for mould and bacteria to thrive, particularly in sectors such as education facilities and healthcare environments.
Pollutant Build-Up
In addition, volatile organic compounds (VOCs) and chemical residues from cleaning products or building materials accumulate when fresh air is not circulating.
System Contamination
Over time, airborne particles settle on surfaces and within ductwork. Consequently, when HVAC systems restart, these contaminants can be redistributed throughout the building. To reduce this risk, integrating in-duct air purification systems helps address contamination at the source.
Risk Mitigation
Before shutdown, conducting a thorough assessment allows facility teams to identify vulnerable areas and implement preventative measures effectively.
Choose the Right HVAC Strategy
Avoid Full Shutdowns
While turning systems off entirely may reduce short-term energy costs, it often leads to higher long-term expenses. Therefore, remediation and system strain should be carefully considered.
Run, Reduce, or Cycle
Instead, cycling systems or running them at reduced capacity is typically more effective. This approach maintains baseline ventilation and humidity control while aligning with best practices across commercial buildings and industrial facilities.
Energy vs Air Quality
At the same time, occupancy-based control strategies allow facilities to balance energy efficiency with indoor air quality, ensuring buildings remain safe without unnecessary energy consumption.
Infrastructure Protection
Ultimately, maintaining minimal airflow prevents stagnant air pockets and supports long-term HVAC system performance.
Implement Pre-Holiday Air Reset Strategies
Remove Contamination Sources
First, clear refuse areas, sanitise kitchens and food preparation zones, and remove any damp materials that could promote microbial growth.
Target High-Risk Areas
Next, focus on spaces prone to odours or contamination, such as washrooms and storage areas. In these cases, solutions from the BioZone Air range are particularly effective.
Deploy Air Purification
Additionally, installing targeted air purification solutions helps neutralise existing contaminants before the building becomes unoccupied.
Proactive Preparation
Overall, addressing risks early significantly reduces the likelihood of air quality issues during closure.
Plan a Post-Holiday Building Flush
Why flushing matters
After a period of low occupancy, indoor air can contain accumulated pollutants, odours, and microbial contaminants.
Recommended approach
- Run HVAC systems at full capacity before reoccupation
- Allow sufficient time, typically 24 to 48 hours depending on building size
- Ensure fresh air intake is maximised during the process
Enhanced air hygiene
Furthermore, integrating solutions from the BioZone Ventilation range ensures that circulating air is continuously treated, improving overall indoor air quality and reducing health risks.
Operational readiness
As a result, a structured restart process ensures that employees, students, and visitors return to a clean and safe environment.
Take a proactive approach.
Contact us to discuss how to optimise your building’s air quality strategy during holiday shutdowns.
Authoritative guidance
Indoor air quality and ventilation strategies should align with recognised frameworks and standards. For example, guidance from the
World Health Organization, US EPA, Safe Work Australia, and ASHRAE support safe, effective, and sustainable building operation during both occupied and low-occupancy periods.