Dehumidifying and cooling large indoor pools, or natatoriums, can be quite a substantial challenge because of the heavy sensible/latent heat load placed on refrigeration equipment.
Most dehumidification equipment does a reasonably good job of recycling waste heat to the pool water and space to supplement heating costs, rejecting the balance to an external condenser when operating conditions have been satisfied and space cooling is required. One dehumidification equipment manufacturer found a way to accomplish both tasks while actually lowering equipment and operating costs.