My situation is a little different because I use racks but I had to find a way to keep mine in a cool basement as well. My basement never gets to 60 but in the winter it averages 65-68 which is still pretty cool and using rack systems I was limited to the heat tape as my only heat system within the enclosure so it made for a challenge. What has worked for me is attaching sheets of insulation to all sides but the front. It significantly increased my ambiant temps in the tubs. I don't see why this wouldn't work the same for a pvc enclosure. My ambient in the tubs went from 67-68 to 75-76 with no other changes and only using heat tape as my heat source.
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