My husband and I are considering adding new windows in several rooms of our house to increase the light coming in. My concerns are that we will have to hire an engineer in order to do this and also that we will have to install all of the windows at once instead of doing it one at a time. Can anyone share their experience with adding new windows to walls?

Hi, I'm on the 4th (top) floor of a multi-unit fully renovated brick condo builiding in Chicago. The devloper installed aluminum windows (I hear it is good for multi-unit buildings, but it is not good for the cold!). Since I moved in (for the past two winters), when it gets very cold outside the rail on the bottom of the window gets frosted over. This most likely happens at night when the thermostat goes down to the high 60's. During the day, when my inside temp goes up to the low 70's and the sun beats down on the windows, the frost melts and drips onto the wood sills. This obviously is bad for the wood. So obviously, this is a condensation issue. However I don't believe I have alot of humidity in my home. I am relatively sensitive to humidity (I can feel and smell it... one day my girlfriend turned on the humidifier on the a/c unit to the lowest setting and I could sense a change as soon as I walked in). Part of the problem may be that the room in question is directly attached to the kitchen, where burning gas may leave behind some moisture. In any event, I don't think I can cut moisture down much lower in my home unless I want a bloody nose in the morning. [U]I want to stress that there is NO condensation on the window glass itself[/U]. There is only water/frost on the pull (I'm not sure if that's the right name, but it's the metal handle that runs across the window bottom to open/close it), and on the aluminum frame near the window bottom. I know that the aluminum was a poor choice, and it the metal getting very cold that causes this, but there doesn't seem to be a way to prevent this. As all the metal parts of the window are connected, that means cold will always be wicked from the outer frame to the inner one. I am of course worried about damage to the wood (I already had the developer come back after the first winter to replace some wood trim that was damaged from it), and mold. I have thought about painting the window sill with a waterproof paint to at least help combat this. Is that a good idea? Of course that doesn't prevent the main issue of the frost forming in the first place. Is there [I]anything [/I]I can do to help mitigate this? Thanks for your help!