I don't think 50 degreesF is a problem at all. The humidity is, though. I don't have any good suggestions for you except ones already offered. I wouldn't leave a solid guitar in < 40 percent humidity for more than a few days at a time.
I don't think any of the commonly avaialble case humidification systems will cover you for more than a couple weeks.
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Guild: 2006 F-512 (Tacoma), 2007 GSR F-412 (Tacoma), 2010 F-212XL STD (New Hartford), 2013 Orpheum SHRW 12-string (New Hartford), 2013 GSR F-40
Taylor: 1984 655 (Lemon Grove)
Martin: 1970 D-12-20 (Nazareth)
Ibanez: 1980 AW-75 (Owari Asahi), 1982 M310 Maple series, 2012 AWS1000ECE Artwood Studio (MIC)
Favilla: ~1960 C-5 classical (NYC)
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