Will audio gear be ok in unheated house

@dill

"when I leave in the fall for theft worries"

- So you are changing your mind about this reason?

Your quote left off most of the original sentence.

It said:

when I leave in the fall for theft worries, but mostly because I am not sure the equipment will be OK in an unheated house in an often damp environment until the late spring when I return.

Theft worries are not the primary reason for moving the equipment.

I let my equipment, including tubes, get down to around 55 degrees fahrenheit in the colder months of the mid-lower South. If in the higher North, I'm not sure I would trust in house temps in the 20s. Friends have a camp in Adirondacks that is closed for the winters. I'm sure the inside temps get into the low 20s but they only have some basic TVs that can be replaced cheaply but those have stood up well. 

"Theft worries are not the primary reason for moving the equipment."

- Yes, I understand that, however since he mentioned it, maybe it should be ...

I have a cabin in Michigan’s Upper Peninsula, it is relatively new construction well insulated and well sealed. I have some older equipment, Antique Sound Lab tube integrated, older DAC, and Vandersteen 2Ci, which I have been using there for several years. In the winter the cabin is unheated, and it typically is in the 30’s inside.  Only in the coldest weather does it drop into the 20’s inside. I know this since I have a weather station that has multiple sensors so I can monitor indoor and outdoor temperatures and humidity from my primary home. I do put out desiccant, specifically Damp-Rid, but it doesn’t do much. In the spring there is still desiccant and some liquid (when the desiccant absorbs moisture it forms a weird liquid in the bottom of the container).  The humidity is typically 50% - 60%, not great but ok. So far no issues with any of the equipment. If you know the humidity is higher or you just want to be extra safe one alternative is a desiccant from hydrosorbent. I’ve used it to protect woodworking tools. You do have to put the item in a sealed container for this to last several months, might be an issue for bigger components, but it works for small items.  Good luck!