Better airflow. You can open the top sash to let hot air out and the bottom sash to let cool air in. That’s a real upgrade in homes without central air or for rooms that tend to get stuffy.
Easier cleaning. Most modern double hung windows tilt inward so you can clean the outside glass from inside the house. If you’ve ever balanced on a ladder trying to wash a second-story window, you know why this matters.
Classic look. Double hung windows work with just about every architectural style, from Craftsman to colonial to modern.