For humidity there limited options, the Monorice 4 in 1 sensor or the ZooZ 4 in 1 sensor are options which have a battery life of between 2 to 4 months typically depending on how it’s configured (assuming you turn all or reduce sensitivity to all sensors except humidity you may get 6 months). You can also check out the Aeon multisensor 6 which also has about the same battery life.
As for the switch, assuming it’s an in wall switch, there are only a few choices, like a GE or a ZooZ switch. I would recommend going for a Z-Wave Plus switch.