Energy-focused window film works on heat transfer through glazing you already own. In summer it holds back part of the solar energy hitting sun-facing windows, so rooms heat up more slowly and cooling runs less often; through a Michigan winter, low-emissivity options aim to keep more warmth on the inside of the glass. The effect depends on the film, the existing glazing and the orientation of the window, so identify what is in the frame before choosing. Film is often considered alongside replacement glazing because it is a surface-level change that avoids taking windows out, and the same layer also manages UV and glare. Ask the dealer which of the energy-focused ranges suits your home, and compare the specifications for that exact film.
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