Do Indoor Pools Need a Dehumidifier?

Indoor pools create one of the most challenging humidity environments in any building. Large water surfaces, warm water temperatures, and continuous evaporation release massive amounts of moisture into the air. If this moisture is not actively controlled, it can lead to structural damage, corrosion, mold growth, and uncomfortable conditions for occupants. A dedicated dehumidification system is not optional—it is essential.

Why Indoor Pools Generate Excess Humidity

An indoor pool can release several gallons of water vapor per hour through evaporation. Factors that increase evaporation include:

Warm pool water

High air temperature

Water agitation from swimmers or water features

Large surface area

Even with ventilation, humidity levels can quickly exceed safe limits.

What Happens Without a Dehumidifier?

Without proper humidity control, indoor pool facilities commonly experience:

Condensation on windows, walls, and ceilings

Corrosion of structural steel, HVAC equipment, and lighting

Mold and mildew growth

Peeling paint and delaminating finishes

Poor indoor air quality and strong chloramine odors

Over time, these issues can cause significant structural damage and high repair costs.

Why Ventilation Alone Is Not Enough

While exhaust ventilation removes some moist air, it is often inefficient and expensive for indoor pools:

Outdoor air may already be humid

Heating large volumes of makeup air is energy-intensive

Ventilation does not control humidity precisely

A dehumidifier removes moisture directly from the air, regardless of outdoor conditions.

How a Pool Dehumidifier Works

An industrial pool dehumidifier is designed to:

Continuously remove moisture from the air

Maintain relative humidity typically between 50–60%

Recover latent heat and return it to the space or pool water

Operate efficiently under warm, high-humidity conditions

Many systems integrate with HVAC and pool water heating to maximize energy efficiency.

Benefits of Using a Dehumidifier in an Indoor Pool

1. Protects the Building Structure

By preventing condensation, a wall mounted dehumidifier protects ceilings, walls, windows, and structural components from moisture damage.

2. Improves Comfort and Air Quality

Proper humidity control reduces that "sticky" feeling and helps manage chloramine odors.

3. Reduces Energy Costs

Modern pool dehumidifiers recover heat from the moisture removal process, reducing heating demand.

4. Extends Equipment Lifespan

Lower humidity slows corrosion of metal fixtures, lighting, and HVAC components.

5. Ensures Code Compliance

Many building codes and design standards require active humidity control for indoor aquatic facilities.

When Is a Dehumidifier Required?

A dehumidifier is required for:

Public indoor pools

Hotel and resort pools

School and university natatoriums

Therapy and rehabilitation pools

Private indoor residential pools

Even small indoor pools and spas can generate enough moisture to cause damage without dehumidification.

Ideal Humidity and Temperature Setpoints

Typical recommended conditions for indoor pools:

Relative humidity: 50–60%

Air temperature: 2–4°F (1–2°C) warmer than water temperature

These conditions minimize evaporation while maintaining occupant comfort.