Fix it with a replacement window to seamlessly match the existing windows in your home.
Insert windows for existing vinyl windows.
The extrusions of the vinyl windows would not allow that.
This is a much bigger and more complicated job than installing a vinyl window insert and may require a pro.
Energysavr window inserts are effective interior window insulation panels.
Sliding windows slide open horizontally saving space while offering a clean modern design.
Add skylights to let in additional daylight.
Just to get it out there you could use them but only after you remove the vinyl window completely and install them like it was new construction.
You have two choices for vinyl replacement windows.
They will stop drafts dust air infiltration.
Necessary when existing window frames are old and deteriorating.
However before deciding to tackle the how to install replacement windows job yourself check the condition of your existing window frames.
Start by measuring inside the existing frame including the height in the middle and left and right sides.
Insert windows install directly into the existing frame of the window being replaced allowing you to get the latest window performance features while minimizing disruption to your home.
Push them into the opening inside your existing windows to create an insulating pocket of air.
Insert windows preserve the original frame exterior trim exterior siding and interior casing.
Write down the measurements and use the smallest measurements for width and height to buy your new window.
One solution that has been around for a while is the window insert an acrylic window that fits inside your existing windows often held in place with snap.
The window insert to the rescue.
Replace the entire existing window down to the house frame.
An insert window is a great option when you re happy with the size shape and operating style of your existing window.
To do it that way would be a little counterproductive.
If they re rotten or badly out of square the whole unit including the frame may need replacing.
Next measure the width at the top middle and bottom.
Your question if you can use replacement windows would be no.
If you need to stick to a tight budget you may want to look into vinyl windows.
More advanced project because you have to remove interior and exterior trims and sometimes the siding.