Maidenhair ferns sold as houseplants tend to be almost exclusively selections of Adiantum raddianum. And one of the trickier houseplants to grow well indoors. Lack of humidify and any mistimed watering can do them in pretty rapidly.

This is a tropical maidenhair (Central America, West Indies) so not very cold hardy. If you live in zone 9b and above, you can expect it to survive outdoors, even more likely if grown in a container and moved into protection if colder than normal weather is anticipated.

How much 'hardening off' is required will depend on your location and current temps. And it's a fern for heaven's sake, so of course no direct sun!!