Energy-saving film targets heat moving through your glass, usually the weakest part of any wall. Reducing solar gain keeps interiors cooler through an Indiana summer, and low-emissivity films also slow heat escaping through the glass when temperatures drop, so the furnace holds the house more easily. Steadier indoor temperatures mean heating and cooling equipment runs less often, and the same film filters UV and takes the sharpness out of glare. For many Saint John homeowners, film is worth considering where replacing glazing is not practical, since it is applied to the windows you already have with far less disruption. Identifying the existing glazing first matters: the right film for a single-pane window is not the right film for a sealed double-glazed unit, and a dealer will check before recommending a product.
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