Swimming pool season is a joy, but it shouldn’t be limited to just the warm months. Choosing the right pool heat pump is the key to extending your aquatic enjoyment throughout the year. While the size of your pool is a crucial factor, it’s equally important to consider thermal loss. In this article, we’ll explore why looking beyond pool dimensions and understanding factors that cause thermal loss is essential for selecting the right-sized pool heat pump, especially when the heat output can drop by 40% in winter.

Understanding Pool Heat Pumps:

Before we dive into the details, let’s have a quick look at how pool heat pumps operate. These nifty devices work by extracting warmth from the air and transferring it to your pool water. However, their efficiency is impacted by various elements, including the size of the pool, environmental conditions, and the often-overlooked thermal loss.

The Pitfall of Relying on Pool Dimensions Alone:

Many pool owners make the common mistake of thinking pool dimensions are the sole determinant of heat pump size. Neglecting the impact of thermal loss can lead to an inefficient heating system, particularly when temperatures drop in winter.

What is Thermal Loss?

Thermal loss is the sneaky escape of heat from your pool into the surrounding environment. Wind, humidity, air temperature, and other factors contribute to this heat loss. Ignoring these can be a chilly oversight when it comes to keeping your pool comfortably warm.

Factors Influencing Thermal Loss: Wind Chill Factor:

Wind can be a big thief of warmth. If your pool is exposed to strong winds, heat loss can be significant. Consider windbreaks or pool covers to shield your pool from gusty culprits.

Humidity Blues:

High humidity can dampen your pool-heating dreams. Humid conditions affect the evaporation process, reducing the water’s ability to retain heat. Ensuring proper ventilation and controlling humidity levels can help combat this issue.

Cold Air, Warm Pool:

The air temperature around your pool plays a vital role in heat pump efficiency. In colder climates, your heat pump might need a little extra oomph to battle increased thermal loss.

Night time Nips:

As the sun sets, so does the temperature. night time cooling can lead to significant heat loss. Combat this by using pool covers or thermal blankets to keep the warmth in when the mercury drops.

Efficiency Drop in Winter:

It’s crucial to note that heat pump heat output can drop as low as 40% in winter. This means your trusty heat pump might not work as efficiently when the temperatures are cooler. Choosing a properly sized heat pump and considering thermal loss factors can help compensate for this efficiency dip.


In summary, while the size of your pool is significant, understanding and combating thermal loss is equally crucial. Give us a call or drop us a mail and we will help size your heater correctly. We would love to hear from you.