In reply to Mattia:
I've kept my trad gear and ropes in the loft for a few years, but have brought in down and put it under the bed in the middle of summer when it's roasting up there.
Boots have always lived in the garage.
Sleeping bags - down and synth - have lived in the top of the spare wardrobe but, reluctantly, I've had to put them in plastic bags and put them in the loft, at least for a while until we get a bit more organised since moving house. I'm nervous about condensation inside the bags, so will be keeping a close eye on them.
Thermarests are hanging up in the end of the wardrobe.