Small AC units will use several hundred watts of power (a few amps at 120 V), so you are looking something approaching a KW per hour of use. It will require you to do a lot of work in the winding part, of course. No new energy, so all the energy from the unit has to come from what you put into winding it. The amount of energy needed to put in would be roughly one horsepower, which means, of course, that unless you are winding using a horse, you will have a heck of a time keeping the unit supplied with energy. Probably require a few hours of effort on your part to give it the power to run for an hour.
It doesn't sound very practical to me.