What type of design holds more heat, reducing the energy costs of a pool?

A pool with a darker finish or liner is more effective at absorbing heat, which can significantly reduce energy costs related to heating the pool. Darker colors absorb more sunlight and, as a result, convert more solar energy into heat. This characteristic is particularly beneficial in maintaining warmer water temperatures, especially during cooler nighttime hours or in regions with varying temperatures.

In contrast, lighter finishes tend to reflect sunlight, which means less heat is absorbed into the water. Standard concrete surfaces and tiled surfaces may have varying degrees of heat retention, but they typically do not possess the same heat-absorption characteristics as darker finishes. Therefore, opting for a darker finish can enhance the pool's heat retention capabilities, leading to savings on energy expenses associated with heating.