Last summer our HRV was mostly busted/confused. It was confused by controller wiring and was running in recirc mode where no fresh-air is pulled in. I figured it out using this CO2 meter after being annoyed that CO2 levels (monitored by a Telaire 7001) were not dropping in the house, even when the HRV was running on high/5.
Anyway, the point is, it will be interesting to see if we need to do something like the link below describes this summer. Namely using our standalone dehumidifier to dry the house off since we will probably not often actually need much AC (when it was 100F last summer, we would turn it on just a little at around 5pm). Or maybe the hot-water heat pump will dehumidify things enough even with the HRV bringing in some moist outside air (it’s pretty ridiculously humid at times in the summer here in MA).
Actually, I think the minisplits have a dehumidify mode, but I bet there is a catch.
LINK (see the section “Reduced Heat Gain” and the photo “Photograph 6: Hotel Room Fix”)