Will an ERV/HRV do anything meaningful in the Phoenix desert heat?
I’m building an 800 sq ft house in Phoenix AZ and since my goal is to be extremely air tight (certainly better than 3 ACH50), my thoughts move towards mechanical ventilation.
HRVs and ERVs dominate the mechanical ventilation discussion but I find myself struggling to see if they do anything at all meaningful in a Phoenix summer. That is, each refer exclusively about how efficient they are in heating the incoming air. Heck, “heat” is even in the name for HRV.
Well, heat is the enemy in Phoenix and saving it is the last thing I’d want to do for almost all of the year. Instead, I’m looking at the outside air coming in at 115 degrees to mix with inside air at 80 degrees. Yes, heat exchange is heat exchange and so I’d expect both HRVs and ERVs to temper the incoming hot blast of air with the outgoing chilled air. But… how much? Are there any stats or graphs or docs of any sort showing this aspect of the heat exchange. That is, if a product is 90% efficient at 10C, then how efficient might it be at 40C?
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