Sometimes, when you firmly close one window sash, you inadvertently cause another to open — so slightly you don't realize it.

This allows a draft.

Examples of how one window sash can open slightly when another is firmly closed

You can accidentally compound this error by thinking you've locked a window when you really haven't.

Because both sashes are not fully closed, this window is not being properly locked — the lock isn't positioned to fit into its keeper.

To prevent this, hold one sash closed while you close the other. And make sure the window's lock lines up with its keeper.

With sliding windows (left), push one sash shut while holding the other shut. With double hung windows (right), hold the top sash shut while closing the bottom sash.

	Making a service inquiry? Please help us identify the window at issue. Wallside Windows made since 2003 have unique code numbers printed on the spacer between glass panes in the upper right or left corner of each sash. Please refer to this number — which we call a "unit ID" — when contacting us about a service issue.
For windows without a unit ID, you can help us by providing the following information: In what room is the window located? How many windows are in the room? Do the windows look the same size or is the window at issue larger or smaller? Does the window operate up and down or side to side?

Need further help? Call us at 1-800-521-7800, 8 a.m. to 4 p.m. weekdays, or contact the Wallside Help Desk online for a quick response — usually within one business day.