Yes, modern heat pump pool heaters are designed to work efficiently even in cooler climates. While their performance may decrease slightly in very low temperatures, they are still capable of maintaining a comfortable pool temperature in regions with cold weather. Many units are equipped with advanced technology that allows them to function effectively in temperatures as low as 40°F (5°C). However, in extremely cold conditions, you might need a more powerful unit or a backup heating system to ensure consistent warmth.