Double hung windows open by using shifting the top and cut sashes

https://eggplant-shoe-e28.notion.site/The-Solar-Heat-Gain-Coefficient-helps-estimate-how-much-solar-energy-enters-through-the-glazing-3afc0d147e4f8042a422fc694df35370

Double hung home windows open by using transferring the top and cut down sashes. Their balanced design can simplify cleaning and works well in many traditional abode kinds.