Cool Pool Water: 6 Ways to Keep Your Pool Water Cool



Swimming pools are a cool and refreshing way to beat the heat during the sweltering dog days of summer. There is nothing better on a hot day than jumping into the cool and rejuvenating water of your backyard pool.

So what can you do if your pool water has passed the point of ‘refreshing’ and now just feels like warm chlorinated bathwater? Don’t despair — we’re going to share the best options out there for how to cool your pool in no time so you can actually enjoy your pool all summer long.

#1. Invest in a Mechanical Evaporative Chiller

An evaporative pool chiller (or pool cooler) is a powerful way to cool off your pool in a hurry. It’s basically like an air conditioning unit for your pool that works by using fans to cool the water as it travels through the system. These are most effective when used at night to take advantage of the cooler temperatures.

Not only can a pool cooler decrease your pool water temperature by 10 degrees Fahrenheit (or more), they actually can help you save on pool chemical usage as well. As you probably know, warmer water burns through sanitizer at a much higher rate than cool water and can also be a breeding ground for bacteria. 

With a pool full of nice cool water, your consumption of pool chemicals can easily take a plunge, making your pool less costly and easier to maintain all around. 

#2. Run Your Pool Filter at Night

A budget-friendly option for cooling your pool is the simple and practical step of just running your pool filter at night, rather than during the day. At night the air is cooler and will actually work as an imitation evaporative cooling system, dropping your pool water temperature by a few degrees or so.

This method is a good rule of thumb, especially for pool owners that live in hot climates, however, it won’t produce the kinds of significant drops in water temperature that you’d see with a pool cooler. 

Since the evaporative cooling process is going to be subtle and somewhat dependent on the air temperature at night where you live, this is not a foolproof plan, but keeping the water moving in your pool is a great way to take the edge of the summer heat.

#3. Add a Water Feature

One of the best and most aesthetically pleasing ways to cool off your pool water this summer is to add a water feature to your pool area. This could come in the form of a fountain, a waterfall, or an aerator. Not only are these pretty to look at and relaxing to listen to, but they also have the added bonus of dropping the temperature of your pool water.

These water features work to cool your pool by evaporation as well, removing a small portion of water that travels through the feature to lower the temperature of the pool as a whole. It’s true that you’ll lose a bit more water to this process than you would naturally to evaporation, but it is an effective and budget-friendly option that gets the job done.

Make sure to take advantage of the cooler temperatures after sunset, running your new water feature all night to get the most out of this pool cooling technique.

#4. Shade Your Pool Area

Keeping your pool out of direct sunlight is a great option for keeping the water temperature low. It also has the added benefit of decreasing chlorine loss by UV exposure and saving you money on pool chemicals. 

An easy way to shade an exposed pool area is to install an awning over at least part of your pool to shade it from the strongest afternoon rays that heat up your pool water the most. Not only will your pool stay cool, but you will too! A poolside awning will keep everyone in the backyard cool at your next pool party or barbeque.

#5. Drain & Refill Your Pool

If the temperature has gotten way too high or if you’re due for a water change, starting from scratch with cooler and more refreshing pool water might be just the thing. Draining your pool is an expensive option (and wasteful too) but it might be necessary, depending on how hot your pool water is.

We don’t recommend this option, outside of the most extreme cases, as it is only a short term solution to a season-long challenge. Without a secondary cooling solution, your newly refilled pool is just going to heat up again… not to mention all of the new chemicals you’ll have to throw in to rebalance and sanitize the new water.

#6. Consider a Reversible Heat Pump

Reversible heat pumps are pool heaters that can instantly transform into pool air conditioners with the use of refrigerant and handy temperature controls. 

Installing one of these bad boys for your pool is going to be the easiest option, literally cooling your pool on-demand with the flip of a switch. They are, however, a fairly expensive proposition, especially when you consider the initial price and long-term operating costs.

If you’re looking for a pool appliance that can do double-duty: heating your pool in the winter and cooling it in the summer, a reversible heat pump may be just what the doctor ordered. Not only will you be more comfortable while using the pool, you’ll be able to extend your pool season far longer and truly get the most out of your investment.

Stay Cool This Summer

Trying even one of these helpful tips will go a long way to cooling off your pool water this summer, making your backyard swimming pool a true oasis in the heat, rather than a steamy hot tub you’d sooner avoid.

Keeping your pool water nice and cool not only will make swimming more enjoyable, but it will also actually protect your pool water from algae and bacteria growth while saving you money on pool chemicals. 

Now grab some drinks and have fun in the sun with your refreshingly cool swimming pool.

Categories: Pool Care, Pool Maintenance