I will obviously clear the balcony of all stuff. The only thing it will contain are bird toys, perches, cages, depending on the advice.
Concern 1:
I live in Canada, where temperature ranges during the winter between -5 to - 20 on average. The balcony is enclosed, but the heater does not reach there, and it's floor is cement, with a very tiny hole for water drain, which I can't really use as it's prohibited (well, if it rains they would not know, so hopefully I can wash and use the drain at least once every 3 months, but I'll, of course, still replace whatever is under there. I don't mind spending on wood pine as I like a natural look (how long before you change them?).
Concern 2:
How do I make it warmer? Since it is enclosed...are there any chargeable portable heaters I can buy that will last 24/7, or I'm better off finding a heater that blows off hot air like a portable air conditioner (if that exists) wherein there is a hose that I can attach to the window between my living room and balcony? I will also remove those curtains, allowing some light to come (no direct sunlight; in the summer; it does get very hot in my apartment). I can't obviously open the outside windows during the winter, but during the summer, there is a screen option I can put to have fresh air coming in. Also, if I do manage to put a heater, won't that cause the window to become very moist, and will that create a problem for the health of the birds?
My goal is to acquire every species of Lovebird (all hand fed; there are 9, but I'll probably just end up with 6 or 7 since some are really hard to find or possibly endangered). I don't want babies. I can also convert the dining room before the balcony into their cage areas to give more room for the planned aviary, and each bird will be housed separately. I want to have a very natural look to the aviary...rather put a lot of wooden stuff they can destroy, rather than cloth-based stuff. I hope all of them get along and opinions if that space is big enough for them (14 feet in length, 6 feet wide, and 10ft in height) to have them all semi-supervised while there.
They will also have access to my living/dining room, but I won't be flying all 6 or 7 of them when they have their one on one time with me....