Single hung windows have the top sash fixed in place so only the bottom sash can be moved up.
Double hung vs single hung windows.
A single hung window is different from a single pane window.
The term single hung refers to the fact that the window has a single sash or operational panel.
The difference is that with single hung windows only the bottom sash moves and the top half is permanently fixed.
A sash is the square or rectangular frame containing the window glass and may include smaller pieces called muntins that divide the glass.
A double hung windowis similar in looks to a single hung but includes two sashes or operational panels which can give more versatility.
With double hung windows both sashes slide up and down.
Double hung windows allow for greater ventilation flexibility and are easier to clean.
The less openings there are for heat to go out the more energy is saved.
There are fewer moving parts whereas a double hung requires more work to ensure airtightness.
Double hung windows have two locks.
Single hung windows which cost less are more common particularly in older construction but they are harder to clean.
Hung is a term that refers to the number of operable sashes while pane describes the number of panes of glass in the window.
Both single hung and double hung windows have two sashes an upper and lower sash which separates the window both physically and visually.
Double hung windows are considered to be more secure than single hung ones.
Single hung windows typically cost less than double hung windows.
Single hung windows are considered to be more energy efficient due to the unmovable top sash.
However they cost more to install and repair.
Mainly because they contain less moving parts and are easier to manufacture.
Installation is often cheaper for a single hung window.