Window won't stay open
Hey there,
Thanks for reaching out! Based on the issue with the window, it sounds like you may need to replace the window balances. Balance assemblies are the hardware in the window that support the weight of the sash when the window is open.
To confirm the right replacements, I'll need to see photos of your assemblies, preferably removed from the window. If you are unsure of how to remove them, I am happy to provide you with tutorials on how to do so but I'll need to see photos of the parts in the window to determine the exact type of balances you have.
Please feel free to reach out with any questions you might have in the meantime.