For many years, I’ve had a 24-foot swimming pool equipped with a heat pump to warm it up. A few years ago, I added solar heat to alleviate the burden on the pump (and consequently the power bill!). Nonetheless, when I started up the heat pump every June to speed up heating the water, my power bill jumped almost as high as what I was paying in January. Since the heat pump loses a great deal of efficiency when the temperature gets cooler (especially below 14° C), I was turning it on around 10:00 AM and shutting it off at 7:00 PM.
