How can I ensure that my leopard gecko stays warm and comfortable in its habitat, especially during colder temperatures?

To ensure your leopard gecko stays warm and comfortable in its habitat during colder temperatures, provide a heat source such as an under-tank heater or heat lamp, maintain a temperature gradient of 88-92F on the warm side and 70-75F on the cool side of the enclosure, use a thermostat to regulate the temperature, and provide hides for your gecko to burrow and feel secure.