not sure what your tub looks like but as long as the cover " seals" the tub you should be ok .much like a garage door , as long as it is as wide as the opening your getting all the insulation you need . any overlap is bonus but doesnt add much to the "r" factor . i used to get lids for ours from a lady that built them at home in the edmonton west end . if i can find her number i will get it to you .
if your worried about your electrical bill , unplug the hot tub !
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