We started with the initial design components suggested in the plans for the Merriwether. As a result of the calculation, however, we moved to a more cost-effective—but equally energy efficient—alternative, by upgrading the heat pump, downgrading the windows and replacing some spray foam with cellulose in the roof and walls.


Raising the Bar
Now we were ready to take the design further, by experimenting with what would happen if we added a PV system to our “better” design.


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