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Close up of the triple layer window spacer shows a dark grove in the middle which holds a polymer film stretched between the two outside sheets of glass forming two air pockets.
This photo shows the design of all three houses in the study. All three houses have the same exterior design and floor plan.
The retrofit house has only one 3-ton heat pump located in the insulated and sealed attic compared to the builder house which has 2 heat pumps totaling 4.5 tons; one in the garage the other in the conventional vented attic with the insulation below the un