*disclaimer - Room Size by square footage is an approximation. Please contact an HVAC professional for more information.
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It depends. Fixed chassis window ACs can only be installed in a window. Friedrich Chill Premier models CCF05, CCF06, CCF10, and CCF12 are fixed chassis. Slide-out chassis window AC's offer both options and can be installed in a window or through the wall. All other Friedrich Chill Premier CCW and CEW models, as well as all Kühl models, are slide-out chassis.
The "MODE" button lets you select the mode of operation on your Kühl AC unit. On Cool only models, the "MODE" button cycles between COOL or FAN ONLY. On Heat/Cool models, the "MODE" button cycles between AUTO (heat or cool depending on set point), HEAT, COOL, or FAN ONLY.
The filter light is a reminder to clean out your filter. On average, the filter should be cleaned every 2-3 weeks, but that can vary based on use. You can reset your filter light by pressing the "FILTER" button.
The "CHECK FILTER" light is a reminder to clean out your filter. On average, the filter should be cleaned every 2-3 weeks, but that can vary based on use. You can reset your "CHECK FILTER" light by pressing the "FAN" and "SPEED" buttons at the same time for 3 seconds.
While the carbon filter provides superior filtration for your unit, yes - the unit can still operate without the carbon filter.