23 degC is a pretty good gradient for transferring heat across. Much of the heat transfer across that gradient will be the latent wringing of humidity from exhausting indoor air as well. A phase change system would definitely leverage the effectiveness of the HRV, especially due to the relatively low airflow through the unit. Like a fridge, dehumidifier rigs are designed to run with at least a partially frozen evaporator and survive a long time. During defrost mode, the evaporator would still be effective at doing work, although the condenser wouldn't be adding heat back indoors.
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