@Lilian ... THAT is Beautiful ... such a fresh look with the white background! Brava Lilian!!!
You are like me, I have the bedroom window wide open all night every night unless a major hoolie is throwing rain in (It doesnt the wind blows across the front of the house, not toward it!) and I never have the heating on ...
Autumn weight will be in the description of the wadding such as
Empress Mills Kahtadin wadding which is what I prefer ...
I am however working my way through a full roll of wadding from a Doughtys roadshow (I will never have to buy wadding again) but EM's 3 metre offers are very good value and if I had no wadding this is what I would choose ....
Regarding quilting it .... If you are sashing your quilt you could QAYG it in 2, 3 or 4 more manageable pieces using the sashing strips as the joining strips.
There is a
QAYG tutorial in the Darkside tutorial section and plenty of help online.
The only difference from the standard QAYG method, which typically uses 1" front joining strips on the front and 2" strips on the back, would be the width of your strips and to remember to allow a lil more wadding at the edge of the sections you are joining to avoid having an 'empty' gully between the joined sections.
Practice with a couple of wadded squares beforehand to get the idea of it before joining sections of the quilt.