I wanted to increase the habitat in the garden this year – the obvious way to bring in more diversity was to add a pond attracting a huge wealth of species from frogs, newts, insects, birds, and other garden wildlife.
So what’s this thermal mass thing? Thermal mass is the ability of a material to absorb and store energy in the form of heat. Materials with a high thermal mass can store a lot of energy. They take a long time to heat up, and a long time to cool down, during which they radiate heat to the surrounding air and soil, making them really good at evening out temperature changes. Water has the highest thermal mass of commonly available materials, more so than granite or heavy rock, so a pond is perfect for balancing the temperature.