heat

"...You can make some covers from silk or find black coloured fibre cloth to cover when not in use..."

I use cheap black towels from Walmart. 

You do not want a thermal event. Un cover!

Silks in the summer and leave them on or fold them back. The winter is the same way. 50 years next month with Mcintosh. Nothing better.. If I have the cages in place I’ll leave the silks in place in the winter and just flip an end for a little air..

Change the colors for the seasons.. I have silks over 75 years old I’ve had for 45 years.. Woolite and a 5 gallon bucket once a year. Won’t scratch or hold abrasive material, it’s SILK...

Regards

I put an air purifier in front of my system when not in use. Zero dust.

Make sure you do not run them with the cover on or you could hurt something in the long run but you can cover them any other time you want to.