btw you dir install solar or buy from taobao and install on your ownheat will still transfer via double glazed but at slower rate.
window film works, can reflect up to 90% of the heat..... However, the frame will also transfer heat to indoor.
i got this idea from full window office or those non aircon full window warehouse.
this is another tip for u.... if ur room is hot.... i will open window...and let it cool down before turning on aircon. this will help to save some electricity.....
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