An energy-saving house has a casement window and an external wall or a roof surface provided with a number of heat insulation plates. The combined heat insulation plates provide the same heat insulation level as that of a brick wall or an external concrete wall provided with an insulation layer. An insulation structure covers all parts of the house. A curtain wall is formed by directly connecting or laying wall blocks. A plate-type insulation structure can be replaced by a film-type insulation structure. The house exhibits significant heat insulation and energy-saving performance.
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