Windows can become stuck in their frames due to expansion because of heat exposure or excessive paint. This particularly affects wooden windows in the summer and can be extremely frustrating to deal with. Thankfully, if your windows do become stuck, there are a few simple things that you can do to open them, with only a few simple tools.
Using a Hammer
Collect a small block of wood, a hammer, and a rag. All of these items can be found at most hardware stores if you don't already have them at home.
Wrap the rag around the block of wood, and then place it against the glass of the window in the bottom corner. Tap it gently a few times with the hammer, taking care to not break the glass. This breaks the seal around the window.
Go to the other corner at the bottom of the window and repeat the process. Then, go back to the other side of the window, but slightly above the corner. Repeat the process, going back and forth between both sides of the window pane until you reach the top corner of the window. Then, try opening the window to check for results.
Using a Putty Knife
You'll need a putty knife, a block of wood, a hammer, and a crowbar.
Slide the putty knife between the window and the window sash, and tap it gently with the hammer to separate the two.
Work your way around the window pane, taking care to only tap the putty knife gently to avoid damaging the window.
Place the block of wood on the window sill, and insert the crowbar between the space you've created between the window and the sash. Start at the edge of the sash, using the wooden block for leverage with the crowbar. Switch to the other edge of the sash and repeat, moving slowly towards the middle.
Once you've applied pressure to the middle of the sash, try lifting the window with your hands.
Using a Utility Knife
All you'll need for this is a utility knife. Place the blade between the sash and the frame where the paint may have built up.
Run the utility knife around the sash in its entirety.
Try gently shaking the sash to see if it comes loose from the frame. If it does not, and the above methods have not worked as well, you'll have to call a contractor, as there may be an issue with the window itself that is preventing it from opening. If you want to replace your windows entirely, consider contacting a professional retailer, such as Active Hurricane & Security Protection, for some new windows.