Also, fertilizing should be done only in the morning hours, and only on sunny days. Do not fertilize on cloudy days. The plant is not as active on cloudy days, so you want to fertilize on days when the plant is most active. You could also use fish emulsion to fertilize your orchid plants, but I found it to be very smelly. So, unless you want that fishy smell around, I would stick with the regular orchid fertilizer.
Light is another important part of growing nice orchids.
The light for orchids differs from variety of orchids. The phalaenopsis, dendrobium, and the cattleya all require about the same light. They all need bright light in order to bloom, but not direct sunlight. The sunlight is too hot and would burn the leaves. I would suggest that you place them in a southern window, with a sheer curtain to protect them from the hot sun.