Large. long leaves in phalaenopsis orchids along with a lack of flowers usually indicates that the orchid is not getting enough light. The leaves grow large seeking light. Remember that low light means does not mean no light. Try moving the phal to a north-facing window. An east-facing window works well too as long as the plant does not get direct, bright sun. Shade the east window with sheer curtains.
A typical moth orchid will flower once a year, some bloom more often. The American Orchid Society says that fall or winter temperatures that drop no lower than 55 degrees Fahrenheit will encourage blooms. Other sources claim that it's a nighttime temperature drop of up to 10 degrees F that does the trick. While it can be difficult to create such conditions in the home, you can place your moth orchids in a room with the heat vents closed in winter. Keep the door open during the day to allow warmer air of the home into the room. Close the door at night. Do not allow the plant to experience temperatures below 55 degrees F.
Some experts suggest that the short days of winter encourage blooming.
As with most plants, you might have to find the right spot in your home. Make sure there is adequate humidity and air movement.