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Hot tub cover insulation is reduced The insulation effect of the outdoor spa hot tub cover is a key function. If you notice that the water temperature in your tub drops rapidly and the heating system is working for a noticeable increase in time, this may be because the cover has lost its insulation.
Outdoor spa hot tubs are often installed in open courtyards, patios, or garden areas, lacking natural barriers to block wind forces. Strong winds can easily pass through these open areas and act directly on the tub cover, especially if the cover is partially loose or not fully closed.