I bought a few of the aluminized auto windshield reflectors at Walgreen's for $1 each. They come with suction cups for mounting. It takes two of them to cover the rear window of our 3400. For the smaller windows they can be easily cut to size.
Taking a suggestion from Steve and Vickie Reigle, I also bought a few sheets of 1/4 foam board at Wal Mart. Cut to size and a few small pieces of Velcro, now I've blocked the skylights as well.
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