I am renting a house built in 1886, and the kitchen is FREEZING! The cupboards are on an exterior wall, and they are like little refrigerators (the lower cabinets in particular). Is there an easy DIY way to insulate them? I don't see any holes to plug, and no draft, it's just really really cold. The cupboards don't seem to have their own back, they are just built onto the wall, if that makes sense? I obviously can't make major changes to the house since it is a rental, but if there is anything minor I can do (ie. something that doesn't involve taking walls down to re-insulate them) that would help, I would love some suggestions!