A RecoveryVent HRV (Heat Recovery Ventilator) is an essential aspect of an indoor swimming pool.

Without ventilation an indoor swimming pool will be constantly dripping in
condensation, which leads to very poor indoor air quality and essentially an unoccupiable room.
Rather than increasing your water heating costs by opening up the indoor pool space and allowing the cold air in, a heat recovery ventilator will ventilate the area without losing all of the warm energy.
The heat exchanger will transfer the warm energy from the exhaust air and use it to heat the supply (fresh) air that enters the room.