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Children lined up in a pool holding kick boards

The environment in your pool room can change based on a variety of factors, many of which are out of your control. The capacity of your pool, the temperature outside and the humidity in your region can all have an effect on your pool. It's up to you to choose an effective HVAC system to keep the environment regulated and maximize your indoor swim spa's ventilation.


Along with your HVAC system, the following factors play a role in creating the ideal natatorium:

Facility Construction

Building materials and construction techniques play a significant role in the health of your indoor pool room. Missing or broken vapor barriers can lead to the accumulation of condensation within the walls of your facility, which can lead to structural damage over time.



Pool Room Ventilation

If you notice condensation on the windows of your indoor pool room, there's a good chance your facility has poor ventilation. You should make sure that vents and air ducts fully cover the windows with conditioned air. Your indoor pool air conditioning system should also move fresh air down to the breathing zone to ensure good air quality for your guests.



Humidity and Temperature

Dehumidifiers are an essential way to regulate the amount of moisture in the air in your indoor pool facility. The right indoor pool ventilation system can also cool or heat the air to a set temperature.



Water Chemical Balance

The majority of indoor and outdoor pools contain chlorine to keep the water clean. When chlorine interacts with sweat and other organic materials brought into the water by swimmers, it creates a gas called chloramine. Chloramine is the source of the typical "chlorine smell" you find in indoor pool rooms.


High levels of chloramine can have negative effects on the health of swimmers and guests, so it's important to check your pool's chemical balance regularly. It also helps to choose a swimming pool ventilation system that brings in fresh air from outside.

Photo of a swimmer underwater
School natatorium with multi-colored flags over the pool


What should techs, owners and builders look for when installing new air handling equipment for swimming pools? Here are a few things to keep an eye out for in your facility:


  • Space and water temperatures: You should always keep track of the temperatures within your facility. If you want to reach the ideal humidity level for your HVAC system to work, then the water in your pool should be about two degrees lower than the air in the room.
  • Building pressure: Natatoriums should always have negative building pressure, meaning that there is more air going out than coming in. You can check the pressure of your building by opening the door. If you notice the air is being pulled in, your building has negative pressure. If the air pushes out, the pressure is positive and you may run into issues.
  • Watermarks and corrosion: If you suspect that your dehumidification system isn't working properly, look around for signs of water damage. Is there premature corrosion on the hardware of your doors? Do you see watermarks around your condensate drain pan, indicating overflow? If so, the humidity levels in your facility are probably not ideal.


If you're searching for an innovative pool HVAC system that will help you save money on energy costs and maintenance, look no further than Ventwell. We'll help you design the perfect swimming pool ventilation system for your facility. Reach out to us today to learn more.