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How Can I Cool My Swimming Pool Water Temperature? Heat Pumps and Chillers



How Can I Cool My Swimming Pool Water? Heat Pumps and Chillers

By Marcus Sheridan,

Each year about this time I get calls from previous customers making such comments as:

"I can't believe you were right."

"We haven't used it much but boy are we glad we have it now."

"I can't believe what a difference it makes on such hot days as these. Wow it's refreshing!"

So what are these comments referring to? Well, the answer is Heat Pumps with Chillers. Whenever I sit down with a potential pool owner, the subject of a heater always comes up. Many customers know they want a heater and decide on getting a heat pump vs a natural gas or propane heater. They go this route because of how much more efficient a heat pump is compared to gas/propane heaters. Once a customer knows they want a heat pump, the next subject we always bring up is the potential need to cool the pool water. Because so few customers have ever even thought about the need to ‘cool' their swimming pool water, the idea can be almost preposterous. Notwithstanding, more often than not pool owners in warmer climates(this includes Virginia and Maryland) will find a need at some point during the season to cool their water. This realization is always surprising, hence the comments at the beginning of the article.

To explain my point further, I'll use my pool as an example. I have a 16'x38' fiberglass pool that has a maximum depth of about 6'. During this past week, with the daily temperature here in Virginia hovering around 100 degrees, the pool water has gotten into the 90s. This essentially means that it's the hottest week of the year and my pool is not very refreshing. This is also a reminder to me to make sure I get a heat pump for next year so that I do not have this issue again. There is a major difference between water that is 90 degrees versus water that is 83 degrees (or thereabouts) when the ambient temperature outside is so hot. In fact, I have had customers after having owned their pool for a couple of seasons decide to get a heat pump ONLY for the cooling component, without much interest at all in the heating benefits.

So my advice here is simple: Strongly consider a heat pump with a chiller if you are considering a heater for your pool. It's important to understand that once a heat pump is installed, a chiller cannot be added later. In other words, you either have to get the unit with or without the chilling component up front, without the option to add the feature later. A heat pump with a chiller/cooler usually costs about $1000 more than one without. And if you're wondering what type of pool will most likely get too warm during the summer the answer is this: Any pool with a colored finish that is less than 6.5' deep. Persons with pools 8' or deeper typically will not find their water getting too warm, although this can certainly happen in some cases.

So good luck to all during these blistering days as you cool off in your swimming pool!

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What type of heat pump with a chiller / cooler do you recommend?
Posted @ Monday, August 24, 2009 10:05 PM by Clint Fowler
Good question Clint. There are some pretty good heat/cool units available on the market today, but if I had to say who was the most respected in the industry I'd say it was AquaCal.
Posted @ Tuesday, August 25, 2009 7:08 AM by Marcus Sheridan
Here's a simple and very inexpensive solution to cooling your swimming pool water. It uses existing equipment for zero energy cost. It is easy to install. Moreover, it will cool your pool 8 to 10 degrees. Check out the web site at
Posted @ Friday, August 05, 2011 5:43 PM by Mark Chuckran
Arctic Rain looks great, sounds great AND cools your pool quickly! These fully adjustable units blend seamlessly with your poo and retail for $45 per unit!
Posted @ Thursday, June 20, 2013 5:45 PM by Travis
Once a heat pump is installed a chiller cannot be added later. AC service Magnolia
Posted @ Sunday, February 02, 2014 11:26 PM by jak smith
I live here in Palm Springs, CA 
and today the temperature is 115 at 
3:00pm. I have been using a very old 
technique to cool the community pool. 
The highs during the day range from  
107 to 115 (short bursts)and the lows are  
85 at night. We installed three water falls, 
one for each return port of the pool. We run them 
at night with good height and arc angle, and run them 
lower during the day. The pool temperature 
was 93 approaching 94 before the WF's. After running 
the WF's all night and half the next day, we achieved  
84 degrees...and had to run them less. The humidity 
here was both low at 12 to 14 percent and also higher  
at 48 to 56 %. The WF's performed flawlessly and we 
use them regularly and swim in a comfortable  
86 degrees. They are super cheap, at 34 dollars each and  
can be installed in 4 minutes by screwing into the 
1.5 inch return ports to the pool. The only expense is letting 
the pool system pump run for as long as you want to cool. 
We typically run 6 to 8 hours a night and 4 hours during the 
day. Works great. 
Posted @ Wednesday, July 30, 2014 5:35 PM by flipper1
Great information on cooling swimming pool water temperatures.Nice information on it.... 
Posted @ Monday, August 04, 2014 7:42 AM by James
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