A pool heat pump warms your pool by drawing heat from the surrounding air and transferring it into the water, like a reverse air conditioner. It’s ideally suited to Adelaide’s mild climate, runs far cheaper than gas or electric heating thanks to a COP of 4–5 (it produces 4–5 units of heat per unit of electricity), and can be used year-round. Installation must be done by a licensed technician, and most existing pools can be retrofitted. What Exactly Is a Heat Pump, and How Doe