How to install a window AC alone?
I don't have a helper, can it be done alone?
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Long as you can lift the unit and hold onto it firmly you can. I have frequently been called upon to do this for the women in my life because they feel that the air conditioner is too heavy for them to lift. I do it alone. Until you bring the window sash down on the air conditioner it is up to you to keep the unit from falling out of the window. That would be bad.
How big is the unit?
It depends how heavy it is, and how much weight you can handle. I did one by myself many years ago, using sawhorses to help me while maneuvering it.