Stupid semi-d get the sun no matter what so I'm forced to tint my window. My room is facing directly to the East so I have to tint it. I like dark room so my tint's only allow 5% light transmission. and my curtain has a blackout layer. If you're normal human prefer normal light source without switching on your light in the middle of the day, pick a tint that's around 15%-35% light transmission. Curtain just use normal linen backdrop will do. Blackout is like hotel, most people hates it cept me and my other half.

Heat, the curtain guy told me blackout helps but I've no idea if it really works on reducing heat so just pick a tint with high heat transmission say at least around 60%-70%. My aircond is running at 20C with 1 fan speed only most of the time and the temperature is cool. If I want chilling effect I just need to up the fan speed. But heat transmission is a double edged effect so if you are not using any air conditioner or power's out, don't do any heat generating activity.