I don’t think any of that equipment will be damaged in any way. I’ve left some good quality equipment in an I heated storage unit w/ no issues at all; speakers, turntable, electronics. It’s rapid changes in temperature that can be harmful, not slow steady ones within the temperature range your house will experience.
As previously mentioned, by far the most potentially damaging thing you can do is turning on equipment while it’s still very cold. Any moisture that might be present can get quickly heated by some components like resistors, transformers etc & then condense on a nearby cooler component & then short out.
I experienced this first hand many years ago when I turned on a TV that was out in the garage on winter & a small fireworks show ensued. Lesson learned on a fortunately a piece of junk. Lesson learned.