Tropical plants
Most plants originate from a place far from the cold Netherlands. They grow in a warm desert or a moist rainforest. They find more or less the same warmth in our living rooms, but they lack the other advantages of living in nature. With us, it is sometimes real survival in those dry newly built houses, especially in winter. That is why being outside for a while is very nice for a tropical houseplant: a real rain shower instead of a spout from the watering can does wonders.
Rain lovers
A sprinkling or a shower can make some houseplants feel better immediately. By watering, you increase the humidity and imitate the living conditions in the tropics. Is it 15 degrees or higher outside and do you see rain on Buienradar? Then you can put plants you normally water outside. Rainwater tastes much better than tap water.
Make sure the plant is in a pot with a hole in the bottom, so the excess water can drain away. Preferably stay nearby for a while to see if the houseplant is not completely washed away. A flower pot on wheels is super handy, so you can move it more easily from inside to outside and vice versa.