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Insulating view-through energy-saving window curtains with hole-free optical film — shading without blocking the view, insulation without dimming the light. No glass removal needed: a preferred retrofit for west-sun offices, schools and hospitals that cuts air-conditioning energy use in existing buildings.

The AC is set to 22 degrees C, yet a desk by the window feels like 28 — the difference is solar radiant heat. Reflect the heat back outdoors before it enters: about 88% of solar heat is turned back, the AC set point can go up about 3 degrees C, and there is no need to choose between shading and daylight.

Shutting out the summer sun, keeping a room cool — real feedback on the ESEC One-Way View-Through Energy-Saving Window Curtain this summer.

In 2026, energy retrofits of existing public buildings are starting to come with targets: an overall energy-saving rate generally no lower than 15%, and investment per square metre generally no less than 80 yuan. With that policy basis in place, the maths behind glass replacement, window film and add-on window curtains is being compared afresh.

Glass is a building's biggest heat leak in winter. Using the heat transfer coefficient (U-value) and the curtain's additional thermal resistance R = 0.2 m2.K/W, this article sets out three sets of numbers for a pre-heating-season glass insulation retrofit: heating energy saved, room temperature and condensation, and the installation window itself.

A free WeChat mini program that pre-loads standard thermal algorithms and climate data for regions across China: K-value and SHGC in about 30 seconds, plus annual energy, electricity-cost, energy-saving-rate and payback estimates.

In 2026, "good houses" were written into the Government Work Report for the first time, making the creation of safe, comfortable, green and smart living environments an explicitly deployed national priority.

The normalization of extreme heat has become a new feature of climate development.

July's heat wave swept the globe, with country after country setting new all-time temperature records. China's domestic electricity load hit a record high and the pressure from air-conditioning demand surged sharply.