One option, if you live somewhere where this is a likely event, is to prep an ice room - an underground room that is small, with thick well insulated walls. That alone will keep it ~5c which is good, but it can be lowered further by freezing blocks of ice and stocking the room up when the power goes out/heat waves hit.
Note this requires a number of things - a large Chest freezer to freeze big blocks in (small blocks melt quicker. Bigger the block, the longer the room lasts). It also requires a basement you can modify, and a floor drain for when the ice slowly melts.
It’s a lot of work and likely not worth it unless you Need to use it regularly, though with climate change it may become more useful. As always, consider radon readings in your basements, as well as a CO monitor. Bad air sinks, and the whole point of this is you don’t want to die
One option, if you live somewhere where this is a likely event, is to prep an ice room - an underground room that is small, with thick well insulated walls. That alone will keep it ~5c which is good, but it can be lowered further by freezing blocks of ice and stocking the room up when the power goes out/heat waves hit.
Note this requires a number of things - a large Chest freezer to freeze big blocks in (small blocks melt quicker. Bigger the block, the longer the room lasts). It also requires a basement you can modify, and a floor drain for when the ice slowly melts.
It’s a lot of work and likely not worth it unless you Need to use it regularly, though with climate change it may become more useful. As always, consider radon readings in your basements, as well as a CO monitor. Bad air sinks, and the whole point of this is you don’t want to die