Question: what are the best curtains to keep heat in?
Answer: Best Home Fashion Wide Width Thermal Insulated Curtain.
NICETOWN Window Treatment Energy Saving Blackout Curtains/Drapes.
Thermal Insulated Grommet 52-by-84 BU Miuco.
Flamingo P Full Blackout Wheat Curtains (52 x 96 Inch, Set of 2)