Question: what are the best curtains to keep heat out?
Answer: Best Overall: Best Home Thermal Blackout Curtain. Best Home Fashion Wide Width Thermal Blackout Curtain. ... 
Best Pick For Smaller Windows: AmazonBasics Room Darkening Blackout Window Panel Curtains. ... 
A Fun, Patterned Pick: HLC.ME Lattice Print Thermal Insulated Blackout Curtains.