Designing Kitchens and Bathrooms - Bathroom paint on ceiling and wallpaper

hello again. We just had our bathroom repainted and wallpapered. We have a fairly small or average sized bathroom that has a window in it looking out into the backyard. My family likes to take HOT showers and in the wintertime we keep the window closed. Plenty of condensation forms on the walls and ceiling. Now just 4 months after the painting it seems that the seems of the wallpaper are begiining to lift and the ceiling at certain places is bubbling. The painter/wallpaperer we had was very professional and trustworthy but he warned us that without proper ventilation this would happen. BUT and I repeat but we cannot keep the window open or we would FREEZE upon exiting the shower. A previous contractor told us to install a fan above the window for exhaust but it would be quite a job since the space above the window is not large and there is a brick outerfacing on the outside of the building.
is there any solution you might think of that we can do as a small step to lighten the heat and condensation when we take showers. Remember there are 4 of us and when we take the showers one after the other the walls are drenched and the ceiling is drenched. I wipe them off from time to time but that is the best I can do. Is there something I can try in the meantime to stop what is happening other than to call in the painter again and again and have him redo the ceiling and patch the rising seems in the wallpaper???
Help needed!!

montek,

You seem to already know the answer and it appears that you are reluctant to take care of the problem properly.

I must congratulate your painter on knowing what is right or wrong with your current bathroom. He can't be doing the repairs for free since he warned you of the results with no proper ventilation. If you keep paying him for repairs you can easily afford to have someone come in and install a good bathroom exhaust fan. By the sounds of it, it better be at least a 90CFM!

http://www.broan.com/product-category.asp?CategoryID=524

Only suggestion is to open the window and leave the bathroom door cracked open. I know, here comes the cold air and there goes the privacy...which is better? There is no easy fix to this but there is a good remedy as suggested above. Don't let it damage more, it will dearly cost you more in the end!

Hope this helps!

Doug is 100% correct. I'm surprised that your building codes allow a bath without a vent.
Is there any reason you can't vent through the ceiling and out under a soffet? Seems like it would be less trouble than poking through a brick veneer.

A dehumidifier will help reduce humidity. A fan will improve air circulation, as will leaving the bathroom door open, cracking the window when bathing.