Storm Windows

Tips from Real-Estate-Agents.com

Storm windows are an extra window that cover the inner window. They provide extra protection and some thermal insulation during cold weather and come in two basic styles. An "add-on storm" is suspended from hooks and held closed with a gate hook and eye. They are exchanged for screens in warmer months. A "combination storm" is screwed into the exterior trim. The sashes and screen slide in tracks and can be raised and lowered to fit the season.

-- Tips courtesy of Service Magic