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Well their body temp runs pretty high so they can dump enough when the temp is in the 90s but around 100 they find it hard to get rid of body heat since they aren't built for it, Mostly they depend upon evaporation from feathers wetted in a body of water. When they lay normally the wings act like a overcoat and holds heat in. Laying on their back thry can radiate from their underside In females they are built to radiate heat this way to hatch eggs. I'm not sure what you mean by lock them up but if confined to a building during the heat of the day make sure it is ventilated and it would Help to have a water source that they use to wet their feathers. I know of two Canada geese relocations that went wrong by confining geese in closed trucks. We have 'pest' Canadas that don't fly North for the summer. They are protected but it is possible to get a permit to relocate them. Shortly after the goslings hatch the adults will molt and it is possible to round them up since they will stick by their goslings. The one that got the most press the geese on the state capital grounds were rounded up to be relocated to the cooling lake of a nearby [~15miles] nuke power plant which wanted more wildlife to show how safe and "Green" they were. Only the few geese that got stuck in a A/C van survived the others in a big non A/C truck were DOA due to the heat. The TV showed the A/C goose release but not what the fate of the other geese was.
Just to be clear I lock up my geese at night [cooler then] in a barn but in the daytime they are confined in a fenced area protected by hot wires outside the fence and there are Kiddy pools for bathing and cooling. The water in these shallow pools gets fairly hot though.