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The Perfect Pool Temperature for Your Backyard Oasis

The ideal temperature for your backyard swimming pool can be quite a contentious topic. What feels too chilly to some may be just perfect for others.

While some may crave the warmth of a toasty pool, others revel in the exhilaration of plunging into an ice-cold oasis on an extremely hot summer day.

 Everyone has their own notion of the perfect fiberglass swimming pool temperature, making it a subject of considerable debate.


Why is it important to discuss, you ask?

Well, there are numerous factors that come into play when setting the temperature for your pool.


As a general guideline, the sweet spot for a comfortable pool temperature falls within the range of 78°F to 82°F (26°C to 28°C).


However, it’s worth noting that certain temperature extremes can pose risks for specific groups of swimmers and even introduce contaminants into the water.


Additionally, some temperatures are more conducive to various aquatic activities.


With that in mind, let’s explore a few recommendations for determining the optimal water temperature for your pool.

Why Do You Need to Maintain the Swimming Pool Temperature?

Ensuring the optimal temperature for a fiberglass swimming pool holds significant importance for several compelling reasons:

Swimmer Comfort

Maintaining the right temperature guarantees that the pool remains a comfortable and enjoyable place for swimmers. If the water is too cold, it may deter swimmers from spending extended periods in the pool, ultimately limiting its use. Conversely, excessively warm pool water can become uncomfortable and potentially pose health risks.

Prolonging Pool Life

Fiberglass swimming pools are engineered to withstand a wide range of temperatures. Furthermore, they offer greater energy efficiency compared to their concrete counterparts. The smooth surface of fiberglass pools efficiently reflects heat into the water, reducing heat loss. Consequently, fiberglass pools require less energy to sustain their desired temperature compared to concrete pools. This energy efficiency can contribute to prolonging the life of your pool.

What Happens if the Swimming Pool is Too Warm?

When your swimming pool is too warm, several issues may arise:

Bacterial Growth

Elevated water temperatures create favorable conditions for the growth of bacteria and algae. This can result in water that appears cloudy or green and may become unsafe for swimming.

Altered Pool Chemistry

High temperatures can disrupt the balance of chemicals in your pool water.

For example, chlorine becomes less effective at higher temperatures, which can lead to inadequate sanitation and the growth of harmful microorganisms.

Comfort Concerns

While some people may prefer warmer pool water, excessively high temperatures can be uncomfortable for swimmers. It can lead to overheating, excessive perspiration, and discomfort during prolonged periods in the pool.

Energy Costs

Maintaining a very warm pool can significantly increase energy costs, especially if you’re using a pool heater. This can result in higher utility bills.

It’s important to strike a balance between swimming pool temperature and comfort. While competitive swimmers may prefer cooler water, others, like young children and senior citizens, may enjoy warmer temperatures.

Generally, the recommended temperature range for a comfortable and safe swimming experience is between 77°F and 82°F (25°C to 28°C).


These temperatures are low enough to discourage bacterial growth while still providing a comfortable swimming environment.

How to Lower the Temperature of your Swimming Pool?

Here are several effective methods to lower the temperature of your swimming pool:

Water Features

Install waterfalls or fountains in your pool. The motion of the water causes evaporation, which naturally cools the pool water. These features also add an aesthetic element to your pool.

Water Replacement

Every now and then, as required, add cooler water into your pool. This method is highly effective, but it’s important to note that you’ll need to rebalance the water chemistry afterward. Professional pool maintenance services can assist with this process.


Create shade around your pool area to reduce direct sunlight exposure. Options include using patio umbrellas, installing pergolas or awnings, or planting foliage strategically to provide natural shade.

Heat Pumps

Invest in reversible heat pumps that can both heat and cool your pool water as needed. These devices allow you to adjust the temperature with ease.

Water Chemistry

Regularly test and treat your pool water to maintain the appropriate chemical balance. Properly balanced water helps prevent algae and bacteria growth, ensuring the pool remains safe and hygienic.

Pool Pump Operation

Ensure your pool pump runs for an adequate amount of time each day, typically around 8-12 hours. Proper circulation helps maintain water temperature and prevents stagnation.

By implementing these methods, you can effectively control and lower the temperature of your swimming pool, creating a more comfortable and enjoyable environment for swimmers.

What Happens if the Swimming Pool is Too Cold?

When your swimming pool water is too cold, it can have various effects on swimmers, including:

Lack of Breathing Control

Extremely cold water can lead to a sudden gasping reflex upon immersion, which may result in a lack of breathing control. This is especially concerning if someone is not prepared for the shock of cold water.


Sudden exposure to very cold water can cause a shock to the system, leading to rapid breathing, increased heart rate, and potential panic. This can be dangerous, especially for inexperienced swimmers.

Loss of Concentration

Cold water can affect a swimmer’s ability to concentrate and make rational decisions, potentially leading to accidents or unsafe behaviours.


Prolonged exposure to cold water can cause discomfort and pain. It can lead to muscle cramps and may even contribute to hypothermia if the water temperature is significantly below the body’s normal temperature.

Even water temperatures below 77°F (25°C) can impact a swimmer’s ability to breathe comfortably even if there is a perfect size of pool.

How to Raise the Temperature?

Here are effective methods to raise the temperature of your swimming pool:

Sun Exposure

Maximize the use of natural sunlight, especially during the summer when temperatures are high. Sunlight is a highly effective, energy-efficient, and environmentally friendly way to heat your pool. Ensure that there are no excessive foliage or obstructions blocking the sun around your pool area. Also, consider repositioning patio umbrellas to allow for more sun exposure.

Heat Pump Installation

If your pool is not exposed to direct sunlight or you need consistent heating, consider installing a heat pump. Heat pumps are efficient, cost-effective, user-friendly, and durable devices designed to warm your pool water efficiently.

Pool Cover Usage

Although not a direct heating method, covering your pool when it’s not in use can help retain the warmth already generated. Pool covers reduce the rate at which the water loses heat, ensuring that the water stays at a comfortable temperature for longer periods. This practice not only helps maintain the pool’s warmth but may also contribute to lower energy bills.


By implementing these strategies, you can effectively raise and maintain the temperature of your swimming pool, creating a more enjoyable swimming environment for you and your guests.


While owning a pool can be a source of enjoyment, it’s important to stay vigilant and knowledgeable about pool maintenance and safety to ensure a safe and enjoyable experience for all.


When faced with pool-related challenges, seeking reputable fiberglass pool dealers guidance can be invaluable to address any issues effectively.

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