During construction the outer room is a kind of cold that doesn't warm well, blazing hot or frigid like you're outside in January. Onsen is very toasty. Hospitality was generous, heaters, bathroom were not well or at all insulated. So from San Diego to Mt Fuji is colllllld, so be mindful of that's what you're looking for it's rad location w/ free shuttle to/from station. Try wagyu burgers in town!! Onsen outside & inside are lovely, body products OUTSTANDING w/ massage chairs, drink station w/ hot coffee is very welcoming. Just cold or your sweating. Maybe it's a construction during winter issue, the temps...mostly awesome just be prepared for 25 degrees at sunrise. Lovely memories.