MUST remember!!!

All these hot days I've had the Velux© open 8-10" all day, closing it @ bedtime to keep out the nocturnal Beasties.
Since this Roof faces due South it, historically got "hot as the Hobs of Hell" most summers.  This has been mightily reduced by dint of most of the slope covered by Photovoltaic panels.  Add to that the open window during the day and it's sufficiently cool to require the Duvet for comfort.  
Yesterday I forgot.  This a.m. I remembered; so much better prospect for tonight.  
Note to self - does it need a clean?
( :¬o)