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A north-facing windowsill is usually a good place to keep a maidenhair fern, as the fern won't receive much direct light. An east-facing window also works, since morning light is more gentle. If you keep the fern at a south- or west-facing window, keep it 1 foot (30 cm) away from the sill, since the direct sunlight can singe its delicate leaves.  Light is the most important factor in keeping your fern alive and happy. You can also grow maidenhair ferns under fluorescent grow lights in terrariums. If your maidenhair gets direct sunlight, be extra-vigilant about watering it, as it will dry out more quickly. Water your fern enough so that the surface never dries out. However, don't water your fern so much that the soil becomes soggy. Water the plant evenly on all sides as often as daily. To check if your maidenhair fern needs water, lift the pot. If it is half as heavy as when it is freshly watered, it's time.  Remember that air conditioning or heat can both dry out the soil. If you have the air or heat on, you'll need to water your fern more often. Check if your maidenhair fern needs to be watered every day. Maidenhair ferns typically can't sustain in temperatures lower than 60 °F (16 °C). However, they prefer temperatures around 70 °F (21 °C) and higher. Don't worry too much if the temperature drops temporarily, but make sure to warm your fern up as soon as you can. Use a humidifier to create ideal conditions for your fern, especially in the winter. Or, try misting the fern daily with warm water in a spray bottle to create humidity.  If you aren't able to run a humidifier, be sure to check the soil vigilantly, as it may dry out quickly without it. Alternatively, try keeping the fern in a bathroom where the steam from the shower will keep it moist. You can also use a terrarium or glass case to maintain humidity levels around the fern, but remember not to place it in direct sunlight. Any moving air can evaporate moisture and dry out your fern. Keep your maidenhair fern away from any exterior doors, drafty windows, fans, air conditioners, and radiators. It can be tricky to find the right balance of indirect light while avoiding drafts. Try placing your fern in a room with large east- or west-facing windows on a flat surface away from the window. Use an organic liquid fertilizer, mixed with an equal amount of water. Add fertilizer to the soil every 2 weeks from around September through March. Maidenhair ferns like fertilizers that contain fish emulsions.

Summary:
Place your fern where it will get 4-6 hours of indirect sunlight a day. Keep the soil evenly moist in the pot. Control the temperature to keep it around 70 °F (21 °C). Maintain high humidity around the fern with a humidifier. Position your maidenhair fern away from drafts. Fertilize the fern twice monthly in the fall through spring.