Why the airing cupboard?

What is the purpose of the airing cupboard? Get in with me, nice and cosy and you shall find out :)
-
-
-
-
-
-
-
-
-
-
-
-
Music: 

Hot Octoberby Wood Spider
from Free Music Archives
Copyright: Attribution-Noncommercial-Share Alike 3.0 United States
https://creativecommons.org/licenses/by-nc-sa/3.0/us/

and

Horses by The Pictures of the Floating World
From Free Music Archives
Copyright: Attribution-Noncommercial-Share Alike 3.0 United States
https://creativecommons.org/licenses/by-nc-sa/3.0/us/