With double hung models both sash slide up and down – ideal for tall spaces or rooms with limited width; whereas single hung versions only move one way – usually up – making them perfect for specific areas such as bathrooms or basements. Any loose pieces should also be tightened with screws if needed. Finally, double-check all your measurements before cutting anything; one wrong cut can ruin an entire project!If everything looks good then you're ready for installation - just remember: take precise measurements for successful results!Verify that all measurements are correct before ordering or cutting any materialBefore ordering or cutting any material for the windows, it's imperative to verify that all measurements are correct!Double check everything(width, height and depth) using a ruler.