Standard houses will 'sweat' on the inside, especially if you sleep with the windows closed. Most of us release about 2 litres each per night, and it has to go somewhere. Some goes out under the door, some through little gaps around the windows, some through the plasterboard, and some just condenses on the walls/curtains.
Most people know HRV/DVS. They are basic fans that pulls air from your attic, down into your house. This brings the most heat on a summers day, and no heat when there's no sun. Aside from poor thermal performance, your SIPS build probably won't have an attic, and your building will be too airtight for a positive-pressure system.
A MHVR has two fans, one to suck waste air from your house, and another to blow fresh air in. The two airflows pass through filters, and a high-efficiency heat exchanger. The ones we recommend achieve ~94% heat recovery. If it's warm inside in winter and cold outside, you get fresh air, but at indoor temperatures. Most units have variable speed fans (from zero up to a light breeze) and can be controlled by moisture level, timers, CO2 sensors or manually.