Need help with predator proofing

[rosemarythyme]

There's only two small vents plus the windows. Will this be enough ventilation if the windows are open?

No, and especially not in a hot climate. These Over EZ type coops are already underventilated for moderate climates and the general suggestion is to cut open the soffits to allow for ventilation right under the roofline: https://www.backyardchickens.com/threads/coop-modification-recommendations.1517556/#post-25543595 and https://www.backyardchickens.com/threads/texas-heat.1540139/page-2#post-25998208

Realistically you'd benefit from removing an entire wall, or replacing most of one wall with wire mesh, in addition to adding the soffit vents.

 

[A little Daffy]

Thanks so much, Rosemarythyme!!!! They will only be in the coop at night but it still gets pretty hot and humid in S. Florida at night. I really like the window idea!