A little but of weight is a good start. MRN's book is the perfect weight for a desktop humi

Winter is a killer. The ambient RH in my house is now typically under 30%. My desktop humi is about 50% full right now, and so each time the humi is opened, all that 65% RH air is replaced by dryness. I keep those cedar sheets from old boxes over my singles, and a sheet of Tyvek (recycled from courier envelopes) over the cedar, and mist the Tyvek very slightly with distilled water every time the humi is opened.