Most efficient HRV/ERV product for small airtight space, all seasons?
Hi, I’m building a mobile office using a heavily-insulated, airtight 20-foot shipping container. All heating/cooling is via a single heat pump powered by batteries and 2000 watts of solar panels on the roof; this will have no windows. It will be used in New England, so cold winters and hot summers.
I wanted to know what the most efficient heat recovery ventilation would be for such a small space, that I can actually buy in the US.
So far the best candidates I’ve found are:
– Zehnder Novus 300 HRV (claims certified 93% efficiency by Passive House Institute) http://zehnderamerica.com/products/heat-and-energy-recovery-ventilation-units/
– TwinFresh Comfo (claims sensible efficiency of 91%, no PHI cert that I can find, but affordable price and smaller footprint, plus it is a 12v DC system so more compatible with my solar than the Zehner which is AC)
Are there any other products that meet or exceed the efficiencies of these? In my situation, would a central HRV like the Zehnder be better, or a pair of the TwinFresh synchronized for intake/outtake? Thanks for the help.
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