There are many similarities between the stories of Romeo and Juliet and that of Pyramus and Thisbe. However, an important one is the way the stories are written. Both stories use plenty of figurative language in order to create vivid setting and complex characters. This stanza is an example of Shakespeare's use of figurative language.
Cushion or protection. It says that it keeps heating bills low in the winter. Meaning, they're blocking the cool air, and keeping the heat from escaping.
