Heat loss in buildings can be prevented in several ways. 
The most efficient way of reducing heat loss in a building is by improving the buildings isolation. This will significantly reduce the heat loss through the building envelope. This however can be a very costly and involved process. 
Another, simple yet effective, way of reducing heat loss is by replacing old, thin windows, with newer, double-glazed windows which lose much less heat.
Sealing air leaks is another possibility. Air leaks around windows, doors, and other openings can result in significant heat loss. Sealing these leaks with caulking or weatherstripping can help reduce heat loss.
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