Vapour barrier/acustic seal on cabin without hvac?

Building an off grid cabin for a client that will be powered by a hefty solar system and the only source of heat is going to be a wood stove. Owner seems adamant on not installing an air exchanger even though his solar system can easily handle the load. Been searching online and in our local building codes but can’t find a definitive answer for this scenario. If we install vapour barrier and seal with acoustic sealant, will there be any condensation/mould issues? Cabin will mostly be used on weekends and may be vacant for 2-3 weeks at a time depending on the owners schedules. Located in norther Canada so the temps will drop in the winter and will get warm in the summer. With the big differential swings in temperature during winter months going from no heat to hot from the wood stove then back to no heat again, will this cause mould or condensation? I’m thinking it will but I’m not a hvac technician so I’m asking the professionals.

Thanks in advanced