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Double glazing can save money by trapping the air between the two windows. This saves money because it traps the air between the two windows and it heats up making the windows warm.
Cavity wall insulation is used to reduce heat loss through a cavity wall by filling the air space with material that inhibits heat transfer. This immobilises the air within the cavity (air is still the actual insulator), preventing convection, and can substantially reduce space heating costs.
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