There are so many myths about wooden sash windows.
First of all they don't all let in draughts. Much of the time they still work and only the bottom bar, if anything has rotted a bit. You can replace that bit, because it's wood, and it doesn't cost much.
You can also get them renovated, including making them fit snugly, open and close without effort, and stopping any draughts with brushes - which doesn't cost nearly as much as getting them ripped out and something hideous, mass produced and modern shoved in with a load of silicon round the edges 
Ours are beautiful, we live within about 300 yards of the sea, and most of them haven't rotted at all. It's really not that big of a deal.
Our UPVC window, which we didn't put in, is utterly, utterly shite. It moves when you pull or push it. It's ugly. It just isn't part of the house, like the wooden ones are.
It's like putting a Picasso painting in a big plastic frame.
It's also really difficult to open and shut, and sticks all the time.
I'm having it replaced with a proper wooden one as soon as I can afford to.