I know this may be repetative but i did do some research and couldn't find any pics or info on this. We have 1940's house and it currently has around 21 weight and pulley windows in it. I just insulated the attic and walls with blow in cellulose last fall and it did help a little but the windows are terrible. They make the blinds/curtains move. I would like replace 5 or so this summer. I know there are many to choose from, and my uncle, dad, and I would be installing them. My uncle would know a lot of these quesions but he is out of town. Question is would I have to mess w/ any of the trim on the interior or the siding(wood) on the exterior? Also how do I measure them?? Measure from track to track, or from inside trim to inside trim. Or should I have someone do the measuring. From what I understand w/ the research I did is that you take the old windows out, leave their frames, pound the pullies into the wall, use some spray foam ins. to fill those cavities, and install the new windows, which is like 4 screws?? Also if I decide to do 5 or so where should I start?? Second floor or first?? Start where the front of the house is or rear? If I start on the 1st fl., I could do all of the living room and dining room windows. If I start on the 2nd floor I could do our bedroom and our sons windows. I can upload pics if need be.

I'm looking to replace the hollow core 6p doors in my house. They will be painted and one of the primary reasons for this change is to reduce noise. The most economical options are solid pine or solid MDF doors, is one more desireable than the other?