Hi, Sim. Thank you for your recent inquiry with The Home Depot. We do not carry a replacement filter for this item. Please contact Quirky's customer service department at 201-561-0970 for further assistance with a replacement filter. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
Another user said you had to program it through the phone or computer to get the light to turn off.
No heat function built in nor add-on available
This unit is 21 1/8 inches wide. Once you install the slides (wings) it would be too wide for your 22" window. Depending on the type of window you have, you may be able to support without the slides. But make sure you can secure window to prevent movement while this unit is installed.
Through the wall installation is NOT recommended. This unit does NOT have the necessary support hardware (sleeve, etc) to keep it safely installed through the wall. Additionally, there are exhaust vents located on the left and right sides (towards the rear of unit) that may be blocked if through the wall installation is attempted.