When choosing PVC casement windows, consider the following factors:

1. Material Quality: Ensure the PVC material meets relevant standards, with good weather resistance and UV protection.

2. Sealing Performance: Look for windows with excellent sealing capabilities to effectively prevent air and water leakage, improving insulation and soundproofing.

3. Frame Thickness: Thicker frames are generally sturdier and provide better stability and security.

4. Glass Type: Consider selecting double or triple glazing to enhance thermal insulation and soundproofing.

5. Opening Method: Choose a suitable opening style based on your needs; ease of operation and safety are also important.

6. Color and Appearance: Select colors and designs that match the architectural style and your personal preferences.