I am looking for year round green plants that will thrive inside in front of a window and close to air conditioning and will stay the same size.
Growing plants indoors is rewarding in so many ways: the pleasure of tending your indoor garden, the joy of watching your green plants thrive while the snow blows around outside, the beauty of an unexpected bloom in the middle of winter.
Here are a couple of links that may help to get you started. The first is a Toronto Master Gardeners beginners’ guide, and the second a terrific blog post that gives some good practical suggestions:
A small potted herb garden on a windowsill is another great idea – fragrant leaves ready to add to whatever you are cooking tonight. Cacti and other succulents are slow growing and there are many lovely and interesting varieties available, and once again, the Toronto Master Gardeners have a guide to help you: https://www.torontomastergardeners.ca/gardeningguides/growing-cacti-and-other-succulents-a-toronto-master-gardeners-guide/
Even houseplants that tend to grow quickly, like the well-known Heartleaf Philodendron (Philodendron scandens) respond well to a gentle pruning for shape and vigour, and this can also become a satisfying activity, as people who become hooked on their houseplants can attest! Best of luck in finding the rights plants for your space.
Not all houseplants will thrive next to constant cold, dry air from air conditioners. Tropical houseplants in particular prefer more warmth and a higher humidity level than proximity to an air conditioner may provide. Misting your tropical plant’s leaves daily may help. If your plant’s leaves begin to drop, or to lose colour, too-low temperature may be the problem.