covering cage

So I've owned a green cheek conure for about two weeks. Was very quiet in the first week while settling in - however now every time it sees another bird fly past the window he/she flock calls extremely loudly and incessantly (literally from sunrise to sunset) until the bird is out of sight or...

:14: So it's getting hotter! I cover my Lilly with a thin fleece every night when it's bed time. My windows are always open but is that enough to keep her from being too warm on hot nights? Would you suggest I don't cover her in the summer? Or would a thin linen bed sheet be a much better idea...