How much FURNITURE should I store in my unused bedrooms?

I live in a 3 bed / 2 bath house.
In aim to help my Central Air system run-best, I am advised to keep furniture all-around my house.
Even though I do not use my extra two bedrooms, how much / if STUFF should I store in them?
Update: I am not a Hoarder - yet.
16 answers 16