When people think about comfort in a senior living facility, temperature is usually the first thing that comes to mind. But maintaining the right temperature is only part of creating a comfortable indoor environment. Humidity control can be just as important—especially in senior living communities where residents spend much of their time indoors.
From dry winter air to excessive summertime moisture, uncontrolled humidity can affect occupant comfort, building conditions, indoor air quality, and HVAC performance.
What Is the Right Indoor Humidity Level?
For most occupied commercial buildings, humidity is generally most comfortable when it is kept within a moderate range. Rather than focusing on one exact number year-round, facility managers should monitor indoor relative humidity and prevent prolonged periods of excessively dry or humid conditions.
Senior living facilities present an additional challenge because they contain many different spaces—including resident rooms, common areas, dining spaces, kitchens, rehabilitation areas, offices, and sometimes healthcare-related spaces. Each area may have different ventilation and moisture loads.
The goal is not simply to heat and cool the building. The HVAC system must also manage the moisture entering, leaving, and being generated inside the facility.
Why High Humidity Is a Concern
During warm and humid weather, an HVAC system can sometimes maintain the thermostat setpoint while still failing to adequately remove moisture from the air.
This can happen when equipment is oversized, cooling cycles are too short, outside-air systems are not operating properly, controls are incorrectly configured, or HVAC equipment is experiencing a performance problem.
High indoor humidity can contribute to several issues, including:
- Resident discomfort. A 72°F room can still feel warm and clammy when humidity is high.
- Condensation. Moisture may form on windows, ductwork, diffusers, piping, or other cool surfaces.
- Mold and microbial growth. Persistent moisture creates conditions that can support unwanted biological growth.
- Musty odors. Odor complaints are often one of the first indications that a building has a moisture problem.
- Building damage. Prolonged moisture exposure can affect ceiling tiles, drywall, furnishings, flooring, and other building materials.
- Increased HVAC demand. Mechanical systems may operate longer as they attempt to maintain acceptable indoor conditions.
In senior living environments, these issues can affect dozens or even hundreds of residents, making humidity problems much more than an isolated comfort complaint.
Low Humidity Can Be a Health Issue
In New England winters, cold outdoor air contains relatively little moisture. Once that air enters a building and is heated, indoor relative humidity can become very low. Residents and staff may notice dry skin, dry eyes, throat irritation, static electricity, and an overall feeling of dryness. Building materials and furnishings can also be affected by excessively dry conditions.
This dry indoor air can affect more than comfort. The respiratory system relies on moisture to help maintain the protective function of the nose and airways. When indoor air becomes excessively dry, these natural defenses may become less effective. Research has also shown that low-humidity conditions can allow some respiratory viruses to remain viable longer and may contribute to increased airborne transmission.
This is particularly important in senior living communities, where residents may be more vulnerable to respiratory infections due to age, underlying health conditions, or weakened immune systems.
Maintaining appropriate indoor humidity during the heating season can therefore be an important part of a facility’s overall indoor environmental strategy—supporting resident comfort while helping create conditions that are less favorable to the spread of certain respiratory viruses.
Ventilation and Humidity Must Work Together
Senior living facilities require significant amounts of outdoor ventilation air. That ventilation is essential, but outdoor air also introduces a substantial moisture load during humid weather.
If the ventilation system brings in more moisture than the HVAC equipment can remove, indoor humidity can gradually increase even though room temperatures remain normal.
This is why troubleshooting a humidity complaint should involve more than checking the thermostat.
Technicians may need to evaluate outdoor-air quantities, exhaust systems, economizer operation, cooling coil performance, discharge-air temperatures, condensate drainage, equipment runtime, control sequences, building pressure, and dedicated outdoor-air or energy-recovery systems.
Humidity Problems Can Reveal Larger HVAC Issues
A humidity complaint is sometimes a symptom rather than the actual problem.
For example, elevated humidity could be related to a dirty evaporator coil, inadequate airflow, refrigerant problems, failed controls, excessive outside air, incorrect fan operation, or equipment that is improperly sized for the application.
Likewise, unusually low humidity may indicate a failed humidifier, sensor problem, control issue, or excessive ventilation.
Tracking both temperature and relative humidity can therefore provide facility managers with a much better picture of building performance than temperature alone.
Preventive Maintenance Is an Important Part of Humidity Control
Humidity management should be incorporated into a senior living facility’s HVAC preventive maintenance program.
Depending on the equipment installed, maintenance may include inspecting cooling coils, cleaning drain pans and condensate lines, replacing filters, checking humidifiers and dehumidifiers, testing humidity sensors, confirming outside-air damper operation, reviewing control sequences, and verifying that ventilation equipment is operating as intended.
Where humidification systems are installed, regular inspection and maintenance are important. Humidifiers require attention to components such as cylinders, steam distribution systems, drains, sensors, valves, and water treatment components depending on the equipment.
A humidifier that has been neglected may provide inadequate humidity—or create entirely different maintenance problems.
Building automation systems can also be valuable. Humidity trends and alarms may identify developing problems before residents begin reporting discomfort or visible condensation occurs.
Pay Attention to Repeated Comfort Complaints
One room feeling humid may be a localized problem. An entire wing experiencing high humidity deserves a closer look.
Facility teams should pay particular attention to patterns such as persistent musty odors, condensation around diffusers or windows, recurring ceiling-tile staining, rooms that feel clammy despite normal temperatures, unusually dry areas during winter, or repeated humidity alarms from the building automation system.
These symptoms can provide important clues about HVAC, ventilation, or building-envelope problems.
A Comfortable Building Requires More Than Temperature Control
Senior living facilities have unique HVAC demands. Residents rely on building operators and mechanical systems to provide comfortable, dependable indoor conditions throughout the year.
Maintaining appropriate humidity is an important part of that responsibility.
A well-maintained HVAC system should manage temperature, ventilation, airflow, and moisture together. When those elements are properly balanced, senior living facilities can provide a more comfortable indoor environment while also protecting equipment and building materials from moisture-related problems.
Is Your Facility Struggling With Humidity?
If your senior living facility is experiencing high humidity, excessive dryness, condensation, musty odors, or recurring comfort complaints, the HVAC system may need a closer evaluation.
Advance Air & Heat Company provides commercial HVAC service, preventive maintenance, controls support, and humidity-control solutions for senior living and other commercial facilities throughout Southeastern Massachusetts, Cape Cod, and Rhode Island.
Contact our team to discuss your facility’s HVAC and indoor humidity concerns.