How to Fix a Double Hung Window that Won’t Lock Fixing a double hung window that won’t lock is a piece of cake. Theresa Clement walks you through a simple solution to a frustrating problem. How to Clean and Operate Your Double Hung Window Theresa Clement unlocks her double hung window to show you how she cleans the Quality Windows in her own home. How to Reduce Condensation on Your Windows The moisture you are noticing on your windows is the same condensation you’ve probably seen in your car. Theresa Clement shows you how to reduce this condensation on your Quality Windows.