Educational facilities often reduce HVAC usage during summer break to save energy. However, in humid climates, this allows indoor relative humidity to spike above 60%, fueling mold growth on books, carpets, and ceiling tiles (‘Summer Mold’). Facility Directors must maintain a ‘preservation mode’ HVAC setting or deploy supplemental dehumidification to keep the building envelope stable while unoccupied.
‘You save $5,000 on electricity and spend $500,000 on mold remediation. Turning off the AC in July is a recipe for a toxic school in August.’
When administrators weigh the operational costs of cooling an empty building against the budget constraints of a school district, the “off” switch often seems tempting. However, the commercial mold remediation costs associated with a full-scale outbreak in a library or auditorium far outweigh any seasonal utility savings. Managing moisture is not just about comfort; it is about asset preservation.
| Mode | HVAC Setting | Mold Risk |
|---|---|---|
| Occupied | 72°F / 50% RH | Low |
| Setback (Summer) | 80°F / 65% RH | High |
| Off | Ambient | Critical |
In the era of smart buildings, monitoring Relative Humidity (RH) from a central dashboard is the first line of defense. High-efficiency sensors can alert facility directors the moment a wing of the school crosses the 60% threshold. This proactive approach ensures that mechanical failures or extreme weather events don’t lead to a catastrophic mold bloom before staff return for the fall semester.
Libraries and archives are particularly vulnerable. Paper is hygroscopic, meaning it actively pulls moisture from the air. Once the moisture content in books reaches a certain equilibrium, mold spores—which are always present—find the perfect medium to thrive. This creates a seasonal crisis known as “Summer Mold” that can ruin entire collections and require specialized cleaning protocols.
Ensure your school environment is safe for students and staff return.
