Here in Kwazulu Natal, the climate is subtropical and summer temperatures average around 100 to 104 but the worst is the humidity levels which reach into the 80's from October to March. I don't have an AC and definitely cannot sew in those conditions as it is much too uncomfortable. My sewing room also has a west facing window. Think I will have to beef up my lighting in the room so that I can sew at early mornings and at night too.