Condensation on my interior outside walls?

[bluechip]

My house is about 40yrs old, and when it gets cold the ceiling sweats down my walls. I found out that my soffits were stuffed with insulation so I cleaned that out, and made a few more vents where there wasn't enough. Now it only sweats on the interior walls that face East and West.But during the day it kinda dries up. But as soon as the sun goes down it comes right back. I have hot water base board heat. My house is not damp. I have a dehumidifier, which I run in the basement, occasionally. But don't need it all the time.
Any help or suggestions would be greatly appreciated!!

[Total Home Care]

Do or did you have siding put on your home????
have you had your home insulated????
reason i ask i have foud that a home that has been blown in insulation. in walls and the plastic plugs put in the holes,,,,and then siding put over causes a vapor lock ,,,,walls need to breath also so this condensation wont happen....or their is still the possibility that the baseboard heaters are the problems....