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This simple $20 window fix could dramatically cut your heating bill and almost nobody talks about it. For centuries, builders in cold climates used a basic idea to keep heat inside homes at night. Modern science later confirmed that the same method can outperform even expensive triple pane windows. So why did such a cheap and effective solution disappear from mainstream building advice? In this video we explore the physics of heat loss through windows, the forgotten research of Harvard physicist William Shurcliff, and the surprising reason the building industry rarely mentions thermal shutters today. If you want to save energy, reduce heating costs, and understand how a small DIY change can make a huge difference, this is a story you need to hear. 00:00 Introduction 01:40 Why windows lose so much heat 04:00 The $20 thermal shutter solution 07:50 The forgotten Harvard physicist 10:30 How the window industry changed the narrative 14:00 Passive House buildings prove it works 18:30 Real world results and heat loss reduction 20:05 How to build the fix yourself #EnergySaving #HomeEfficiency #DIYHome #HeatingCosts #HomeImprovement