

The only thing I would note is -IF- your volumes are not partition or disk based BUT -files- based there is the possibility that corruption of the host file system of the disk the files containing the volumes are on could result in pieces of those files being marked unreadable by the disk and it’s POSSIBLE one way to solve this would be a file system check utility.
HOWEVER such activities carry a -large- risk of data loss so I would advise a bit for bit copy of the disk and doing the repair on that so if it goes wrong you’re not worse off. -IF- you cannot make a copy then I would advise at least trying to mount using backup headers before doing that and copying off anything you can salvage as file system checks can really mess up data recovery and should only be used in certain circumstances.
You’re much better off trying the recovery software I linked in fact than doing a file system check as it will tend to have better results.
You can also use the option to mount as read only in VC to prevent writes to a suspected failing disk.
Let me know if you need further advice.
Not even a choice.
If you choose over 100F you will see electronics failing more often, working harder, less efficient, working badly, etc because the heat is causing them to throttle in various ways. In the modern world it is far, far easier to heat up a space with a house full of electronics and humans than it is to keep it cool. The energy required to raise the temperature from say 5 degrees F to a more comfortable 40 degrees (35 degree change) pales in comparison to the energy required to keep yourself and your devices cool a mere 10-15 degrees less to around 90 degrees which is still uncomfortably hot and sweaty.
I’ll note that a constant 100 degrees is more than hot enough to cause various foods, medications, substances to break down and go bad. Check your medicine cabinet, most of your pills including over the counter are only rated for storage at up to 86 degrees. Your medicine will lose efficiency or go bad in some, perhaps many cases. Your food outside your fridge will spoil more quickly, mold and bacteria will grow more quickly and readily. Your fridge itself will work harder and die sooner.
The tap water will run hot or warm most of the time meaning a shower won’t necessarily cool you off much.
The colder temperatures are cheaper all costs considered, feel better, can be negated at a moment’s notice with socks, a jacket, and a blanket.
It’s easy to insulate a home against extreme cold and just retain heat you generate inside including by your body and devices. It requires a lot more effort to keep the inside cold when both the outside and things inside are generating heat and trying to warm it up.
This is a reason why climate change is a nightmare not just for human comfort but on so many levels. Our electronics are going to operate less efficiently in a warmer world and draw more power to do so.