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How does insulation work?
Insulation is essentially any material used to fill the spaces as well as little gaps and crevices in your home (behind walls, above ceilings, etc.) to resist heat flow by reflection, absorption (it depends on the material!). This increases your home’s energy efficiency and helps reduce your monthly bills – heat doesn’t as easily leak into and out of your home, keeping it much cooler in the summer and warmer in the winter.