So the home is southern facing and was full of windows on the southern side. So even with windows open/shades down the heat from the sun would still radiate in.

So the home is southern facing and was full of windows on the southern side. So even with windows open/shades down the heat from the sun would still radiate in. When I bought the home I had a company come to help me plan the heating and I don't fully understand the science but the home is built to keep heat in with the windows and no attic.