Nope .. unfortunately pex sweats big time too. I have pex pipes and I get major drippage from my pipes when I run my RO/DI in the winter with that 8 degree cold water. Heck, I get in the summer too, but not nearly as bad since the water is warmer. I get it to a degree when I run sprinklers outside too.
Another reason to consider the HRV and suck that moisture laden air out of the house.
Or get the pipes covered (ie. behind drywall) so that they're not exposed to humidity.