double hung window does not stay after lift lower window

Question

I try to open the window all the way up, but it does not stay or hold, just drop down. What part I need to buy, what size

Bob · Accepted Answer

Sounds like the window might need new balances. There's a lot of factors that go into replacing window balances. This blog article is a good place to start. Once you show us what you have and the exact specifications, we will do our best to help.