Hi there! What's your window cover situation? It gets hot and humid here in the summer. I have drapes/curtains with the white backing that faces out. Before I leave I the morning, I close all windows and close curtains. The place is DARK all day. Upstairs I have room darkening sheer curtains, but they don't work as well as the white backed insulated curtains. When I get home, It's always much cooler in the house. A few weeks ago it was 95 and very humid outside, but in my house the thermometer was reading 75. It was almost as good as having AC. Plus, I don't have AC at work, so It's not as big a transition for me.
It's also much cooler downstairs than up for two reasons.
1. The porch roof shades the first several hours of sun for the say. The porch roof faces east.
2. The huge oaks I have near the house shade the sun for another little while.
When the sun wraps around to the south side of the house, the shade situation disappears, and HELLO HOT UPSTAIRS! Even with the curtains closed. Yuck. At least the downstairs stays cool. :/ Once the temperature changes and the breeze picks up in the early evening we open everything up again.
Not sure of your setup, but how well unsulated is your place? Could you plant/do you have shade trees/shrubs on your south side? (Not near the solar panels of course!)
I have a stupid question. I have lived in winter wonderland all my life- do deciduous trees drop their leaves in the winter where you are? If so, if you have the space, plant some deciduous trees that grow quickly to help shade where the sun beats on your house.
Also- on the hot days, what does the temperature drop to at night?