Buy my hand built Blue Bird boxes, made to Audubon specifications with additional features for bird comfort, safety and longevity.they come made with a replaceable roof covering and a vented sub-roof to let the heat out and a vented bottom to allow air flow though the house to keep the birds cool.
These are available for local pickup here in New Haven as well as for shipping anywhere in the country.
Email or call to order and arrange pickup. The pickup option doesn't appear to work well as of now. We're debugging it as you read this.