I use my drapes, sheers and blinds to control the temperature in my house.
When the heat is over 90 degrees, I shut all of them until the sun is no longer shining in the window.
I shut the sheer curtains, to reflect the heat and turn the blinds to deflect the light when the temperature is in the eighties.
I usually open the windows when it is 60-70 degrees and I leave all of the window coverings open.
When it cools down, I leave the sheers open to let the heat of the sun warm the room.
On cool, cloudy days, I keep the sheer curtains closed to trap the cold air by the glass.
On bitter, cold, cloudy days, I drape the curtains partway closed.
When it comes to heating your house…let the sun work for you!