Since you are doing a custom install, maybe think about adding a second heat exchanger after the HRV, for summer use. The reason is you can up the efficiency of the HRV by running the hot outside air through it. This works because you will have a greater temperature difference between the intake and exhaust air streams. with the Heat exchanger after the HRV you can get the incoming air closer to the indoor air temperature or possibly even below it. The reason for tempering the air in the winter before it reaches the HRV is to help prevent core freeze up, and this isn't a problem in the summer.
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