Rob Cox August 19, 2016
Pool Too Hot? It can happen during the peak of summer sun, especially for shallow pools or pools that don't have much shade from the sun.
Cooling a pool that has crept up into the high 80's and lower 90's even - is no easy feat, but I do of course have some suggestions.
Oh, and let's dispel the myth (or joke) of using Ice to cool a hot pool. You would need literally thousands of pounds of ice to lower temperatures just a few degrees!
Aeration means to mix air with the water. Spraying hot water through the air cools down hot water by exposing the warm water to the cooler air. This works best during mornings and evenings after the heat of the day. A simple Grecian 3-Tier fountain works well, or you can use wall return fountains to spray across the surface. You could also aerate your pool by laying down a perforated hose and pumping cool air from an air compressor, to the hose laying on the pool floor. As the bubbles reach the surface, a small amount of heat exchange takes place.
Running your filter pump more often, especially during cooler night time hours helps to agitate the water, and increases surface heat loss. It also creates a process of convection, with the circulation of pool water transferring heat and resulting in heat loss on the surface. Splashing and cannonball-ing in the pool also creates agitation in the water, which increases heat loss. Some pool cleaners create enough water movement to help encourage heat loss.
Winds are one of the largest heat thiefs - and pools located in high wind areas tend to be harder to heat effectively. Take advantage of this by trimming large hedges, changing a fence design or even setting up a large fan to blow across the surface of the pool, but be sure the fan is plugged into a working GFCI outlet, for safety.
This may be like using a sledge hammer when a claw hammer is needed, but you can install a Heat/Cool electric heat pump on the pool, which can be used to both add heat to the pool, and remove heat from the pool. A pool heat pump works just like a reverse air conditioner, and models that can reverse the process can not only put heat into the water from the surrounding air, but pull heat from the water and release it to the surrounding air. Pool heat pumps are easy to operate, but on the expensive side. With an electrician to wire it up, pool heat pumps cost $3-5K, depending on the size of heat pump installed and how much electrical costs are involved.
One more tip that can help. Adding SHADE over parts of the pool to block the sun. Use large 9' pool umbrellas, or Shade Sails to coverAnd that's all folks! One or more of these methods will cool down your pool so it's not like a hot tub. Or, just wait a few more weeks, one thing's for sure, there is cooler water coming your way!