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Cake day: July 4th, 2023






















  • Ideally it’d be done with reclaimed materials, like the second guy who used old insulation from an RV.

    But at least in my area from a local hardware store, I can buy 1.5 inch 4x8ft sheets of expanded polystyrene insulation for $20 per sheet. 3 sheets should be enough for most fridges (or 4, if the heat exchanger is underneath the fridge), so 60 to $80 for new materials.

    Using this energy star savings calculator, it spits out this rough estimate of the yearly cost of a 1990’s fridge:

    If the foam decreases energy usage by 50%, that would mean a $115 savings within the first year, paying off the initial foam costs within 6 months of use.

    According to that same calculator, this is the numbers they give regarding carbon emissions compared to using a new energy efficient fridge:

    It’s difficult to find the information of expanded polystyrene’s carbon footprint, I think I found it here? Specifically this chart from that article:

    The second column there can be ignored, since we’re not trying to achieve R28, which since XPS foam is pretty low R value compared to other foam insulators would take a LOT of foam. So I guess the first column is the relevant one.