Like Herb, I use a Sears floor model humidifier in the winter. It keeps me and my guitars at 40 - 50 percent rh.
I have a Sears dehumidifier I use in the summer to keep my woodworking shop humidity around 50%. The dehumidifier gives off some heat so you may have to run the air conditioning anyway.
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2009 CA Cargo Raw, 2006 Collings OM-1 SS light build, 2004 Taylor 714ce, 2000 Taylor 310K, 1991 Martin HD-28, 1971 Martin 0-18, 1967 Guild F-30
2006 Ovation Legend 6756LX 12 string, 2004 Taylor 354ce 12 string, 1976 Guild G312-NT 12 string (dreadnaught shape)
1966 Martin T-15 tiple, Mele koa ukulele
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