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Indoor Pool Ventilation Systems: A Guide for Homeowners and Pool Contractors
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Swimming in your own pool, first thing in the morning or last thing at night, is a real luxury.
But an indoor pool is also one of the most demanding environments a building can contain. A pool hall is warm and humid by design, and it’s the indoor pool ventilation system that stops that humidity from becoming a problem for the building, equipment and the people using the space.
This guide is for homeowners planning a pool and contractors and consultants specifying one.
Why Indoor Pools Need Additional Ventilation
Water evaporates from a swimming pool at all times, regardless of whether the pool is in use. Although a pool cover can significantly reduce evaporation, it cannot eliminate it entirely.
Without adequate humidity control the resulting moisture accumulates in the pool hall, leading to condensation on cold surfaces such as glazing before migrating into the building fabric. Over time, this can result in mould growth, corrosion and deterioration of decorative finishes and furnishings, as well as more serious damage to timber and plasterwork.
A properly specified indoor pool ventilation system continuously manages humidity, protecting your property for years to come.
What Happens Without Adequate Pool Ventilation?
Many homeowners assume natural ventilation will do the job. In practice, opening a window can’t remove the right amount of moisture-laden air when it’s needed and it undermines temperature control, particularly in winter.
You tend to end up with persistent condensation, musty air and a space that’s uncomfortable to use. Natural ventilation gives you no control over humidity and it’s this control that protects the building.
How a Pool Air Handling Unit Controls Humidity
A Recotherm Aeris or Artis unit removes humid air and replaces it with controlled fresh air, recovering heat from extracted air on the way. This method optimises humidity and holds the pool hall at a comfortable temperature.
Our systems are designed to account for reduced evaporation rates when the pool is not in use by adjusting the speed of the fans and dampers. This adaptability ensures the ventilation system is both effective and energy-efficient.
The main benefits are:
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Energy-efficiency and Running Costs
A Recotherm ventilation and dehumidification has variable-speed ZA bluefin fans that adapt precisely to the speed required, achieving up to 300% greater efficiency than standard fans.
Combined with a pool cover, a set-back temperature written into the custom control strategy lets the hall cool to a pre-set level without risking condensation, cutting the energy needed to maintain conditions overnight.
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Air Quality and Comfort
Controlled fresh air maintains an optimum environment in the pool hall and removes body odours.
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Protecting Your Investment
Humidity control protects the structure, fixtures and furnishings from long-term damage.
Key Ventilation Specifications for Indoor Pools
For contractors and consultants, these are the main points to agree on early in the project:
- Design conditions
Water temperature, air temperature relative to water, and the target relative humidity - Fresh air and distribution
How much fresh air is supplied and where it needs to be directed in order to prevent condensation - Heat recovery
This efficiency has a big impact on running costs - Fan control
Variable speed fans, dampers and a pool cover set-back strategy - Controls and BEMS
Potential integration with building management systems and remote monitoring - Siting and access
Deciding whether the unit is sited in a plant room or outside and whether access for installation and servicing is tight
The right unit depends on pool size and building type:
- For residential and smaller pools, the Aeris 25 is suited to pools up to 25m²
- For larger private or commercial pools, Aeris 50-200 are designed for surface areas up to 200m²
- For large commercial pool halls a bespoke Artis guarantees a more comfortable environment with greatly reduced running costs
- For replacing an ageing unit, the Aeris M is designed as a straightforward upgrade for existing mechanical dehumidification units
- For environmentally conscious builds, the Aerum is a boiler-free stand-alone air heating and cooling package powered by a heat pump
How Recotherm Can Help
Specifying an indoor pool ventilation system? Recotherm designs bespoke air handling units for residential and commercial pools across the UK with over 40 years of pool-only experience.
Speak with one of our experts for a free technical consultation.
