1. Sliding windows are easy to open and far simpler to operate, so there are fewer potential mechanical problems.
2. Sliding windows are a cheaper alternative as compared to casement windows. Moreover, as they don't open on the outside, it doesn't pose a safety hazard for people walking on the outside.
3. Sliding windows blend perfectly in period properties, refurbishment houses and in cases where casement windows may be considered too modern.
4. Sliding windows let you choose exactly how much space you want to leave open. This way you can regulate the flow of fresh air into your room.