By effectively doing so, the time that it takes to heat and maintain water temperature is reduced and in return, the cost to heat is also reduced. Understanding the benefits and differences between each type of insulation will help you choose the right hot tub and will save you money. Basic insulation consists of a single, thin layer of polyurethane that is applied to the understructure of the spa shell. The biggest benefit to using basic insulation is the cost. Many mass merchants and entry-level spa manufacturers incorporate this type of insulation to reduce the overall cost of the spa.
Basic insulation is a suitable method of insulation for indoor spas.
However, it does not provide an adequate insulating value for outdoor use, nor does it provide any soundproofing benefits. In most outdoor installations, basic insulation will not be sufficient. As a result your hot tub will be very expensive to heat, especially in the winter. Top of Page 2. Full Foam Insulation .