I live in San Francisco, and have ducted air central heating.

I don't need AC that often, but sometimes it would be great.

I'm in the second floor of a 2 unit condo, and have no outside space except a deck.

The furnace is in the garage - is it possible to install a condensor unit in a garage that has an outside wall?

If so is it possible to get a really quiet one so that it doesn't keep my neighbors awake whose bedroom is next door?