When it comes to home cooling and heating the phrase 'work smart rather than working hard' applies; by that I mean you only want your air conditioning (AC) system to work as hard as is necessary to keep your house comfortable.  The way you 'work smart' is to insulate and shade (in summer) your home, that way your AC unit will have a much easier (and longer) life and the heat or 'coolth' it generates stays in your home (where you want it) instead of leaking

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