ERV-Minisplit combo vs. Magic Box
We are conducting a deep energy retrofit on our two unit building (each unit 1,500 sf) in Chicago (zone 5a). I am pretty much done with the first floor and chose the ERV-Minisplit combo to primarily address our ventilation needs, cooling needs and summer dehumidification. And it appears to work well (Recoupaerator and one 12,000 Btu Fujitsu Minisplit): Winter time humidity around 40%, summer time humidity around 55%.
What has always bugged me is that the ERV duct work serves one purpose only: to supply fresh air and exhaust stale air. Wouldn’t it make sense to also use the duct work to distribute cooled (or heated) /conditioned air?
Well, that now seems possible with the emergence of the Magic Boxes (i.e. the Boreal 12000). If I believe the advertised cooling capacity of 8,700 Btu, the Boreal could potentially cover almost all of my cooling needs for the 2nd floor, and I am wondering if this would be the way to go.
But I can’t wrap my head around is this: Which one is more efficient? The Magic Box (i.e. Boreal 12000) – or – the ERV-Minisplit combo. How do you even begin to compare? Should I compare?
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