This response generated entirely by AI chatbot, ChatGPT:
Orchids are tropical plants, and they prefer warm and humid conditions. Keeping them away from cold windowsills is generally a good idea, as exposure to cold temperatures can cause the buds to drop, or inhibit the plant's growth. The ideal temperature range for orchids is between 60-80°F (15-26°C).
Orchids also prefer bright, indirect light. Placing them close to a window with filtered or indirect sunlight is ideal. However, if the windowsill is exposed to direct sunlight, the orchids should be placed farther away from the window to avoid sun damage.
It's also important to keep the orchids away from drafts, as these can also cause the buds to drop. Additionally, make sure that the orchids have good drainage, and that their roots are not sitting in water.
To maintain good humidity for your orchids, you can place a tray of water near the plants or use a humidifier. Orchids also benefit from regular misting to increase humidity.
In summary, it is best to keep your orchids away from cold windowsills, and in a warm, humid, and well-lit location, if you want to maintain the blooming of the buds.