1. Density of the Cover. Look for a cover with at least a 1.5 lb foam density. This type of cover is structurally sound with sufficient insulation. The R-Value for these covers is 12.7, which is an excellent, energy-efficient rate for hot tub covers. Some manufacturers use a 1 lb foam density, but it does not provide adequate insulation. There are even covers with 2 lb foam density, however, make sure the cover is not too heavy and cumbersome to handle. We would recommend a cover lifter for most spa installations.
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