Please take a moment to tell us a little about yourself in the Introduction thread.
You should not need to power your Vinotemp in the winter. Leaving it unplugged will solve the problem of Rh swings as it cycles.
For a 28 bottle Vinotemp I use 1lb of 65% Heartfelt Beads split into two bags.
Cedar drawers and shelves are nice accessories but totally unnecessary. I bought some for my first Vino, but for my second I just use the wire shelves.
If you can get empty boxes from your local shop this will help maintain your Rh at a steady level. You can use them to store singles until you fill it up with full boxes!