Swimming Pools
Pool Care and Cleaning
Evaporation and Condensation

Are pool covers necessary for an indoor pool?


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2015-07-14 16:03:40
2015-07-14 16:03:40

Pool covers should be put on indoor pools, because if something harmful to swim in (such as cleaning liquid) gets in the pool if it's not covered, it could ruin the pool water.

No, - if you don't mind spending a good deal of money on a really good dehumidifier. If you don't use a cover your dehumifying and heating costs will run alot higher that with a cover. Usually pool rooms have alot of windows - sunlight makes chlorine dissipate faster so more chemicals will be needed. A mistake in allowing humidity to become too high in the house will be an unforgivable mistake. We live in Canada and have an indoor pool and have played with leaving it off and on with temperatures varying from +36 to -40. There is a huge difference. I'd just recommend taking the pool cover off just before company arrives. But like I said, dependant upon your financial situation - a well-ventilated residence with a really good humidifying - you shouldn't have a problem - a humidistat in the pool area will help you learn what you particular climate will tolerate.

No, pool covers are NOT NECESSARILY required for an indoor pool, HOWEVER you can cut your costs considerably in operating. Dehumidification should be installed, but as long as the pool cover is off the pool, the dehumidifier runs 90-95% of the time because the water continually evaporates. Next, you lose heat and chemicals to the moisture that is evaporating. So using a cover stops water from evaporating, hence dehumidification does not run 24 hours a day, you keep heat in the pool, so you are not spending money to continually heat, and you will use less chemicals.

Also note: when no cover is on the pool, you must keep the air temperature 2 degrees warmer than the pool temperature. When air temp is colder than pool temp, you are literally sucking the water out of the pool. This increases evaporation of water and can cause increased humidity and condensation in a pool room.

We have an indoor/inground 20ft swim spa. By using a thick insulating cover and cutting the room temperature we have managed to cut energy costs 80% over when it was open 24/7. I have not varied the water temperature. I have heard that 70% of pool heat loss is due to evaporation. 25% is convective heat transfer and only 5% is due to conductive heat transfer. This would mean that using even a flimsy cover may have significant savings. I would expect these percentages to also vary by the environment and temperature of the pool.


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