Sunset Reef, St Kitts Recently named best new boutique hotel in the Caribbean, Sunset Reef has a first-of-its kind geothermal system that powers and, most importantly, heats and cools the resort, from the rooms to the pool. As an example, the geothermal system is nearly 700-800 percent more energy efficient than a typical heating and cooling system. That’s just the beginning here: Walter filtration is sent though four different filters, and the hotel is planing to add wind turbines and add a solar cube to the property.