Bubble wrap, moving blankets, and clear window inserts can all cover the same window. But which ones actually keep the cold out, and which ones quiet the traffic outside?

I compare 12 ways to insulate and soundproof a window without replacing it. I share what happened when I tested blackout curtains and cellular shades, then take a closer look at options like rope caulk, a removable window plug, and clear acrylic inserts from Indow and Climate Seal. Some of these fixes let you keep your view. Others mean covering the glass completely.