i know this isnt the advice youre looking for....but ditch this insane idea altogether. If you dont want to ride in the cold, buy some CC skis, or join a pool, or start running, or rockclimbing, or take up hopscotch; ANYTHING is better than stationary exercise inside. Especially for folks who insist on pedaling all the time.

(i used rollers one winter after a friend gave me a set - I had to give them back).