I don't know how I do it, but I always manage to work on something that has to be quilted down during the heat of summer. This year has been muggy/hot for Seattle and like many other homes of our vintage (early 60s ranch house) we have no insulation, no AC, and casement windows that swing out and no screens... It's pretty miserable for me, I grew up in Alaska and am only comfortable below 70 degrees
My sewing room is on the west side of the house, isn't bad first thing in the morning but like a parked car by 3:00 PM, so insomnia to the rescue! Sewing from 4 AM to noon.
My BFF from high school has just had a lumpectomy, I got a comfort quilt done for her in the heat. I figured having a quilt spread over my lap to hand bind at 85 degrees wasn't all that bad compared to what she was going through.
I have a small group that meets Tuesday and while some of us are often "just visiting" I try to have projects to work on while I'm there. Have decided that my planned quilting projects aren't very portable, so I've been quilting down donation quilts so I can take them to group to work on the bindings. Again, 85 degree days and I have a flannel back to work with. Next one up won't be flannel at least.
But doing all my activities in the morning is key to me, I'm just a hot uncomfortable grumpy slug by 4:00 PM.