Yes if it is designed that way. Most of our customers use the pool and spa for the months of April through October (quite a few from March through Thanksgiving). Some open them earlier and keep them open later. To keep it open all year, it is our opinion that the plumbing pipes should be placed deeper in the earth (below the frost line) and the pool filtering and heating equipment should be installed indoors. These are precautions for the frigid winter temperatures (moving water will not freeze) and the potential for power outages, etc. Most people find that the “idea” of using the spa in the middle of winter is more attractive than actually going out into the yard in the middle of the winter. So the system usually gets shut down and it gives our clients something to look forward to for spring.