You need a stern talking-to your roommates about keeping the doors shut and windows not open far enough for a cat to get out. Get some locks put on the windows that limit how far the windows can be opened. I have them on all my windows; you can unlock them when you want to open the windows further, but mine are all installed so the windows can't be opened more than a few inches - less than cat-head size.

As for getting the cats into the carriers, you have a husband to help (isn't that what they're for? The cats will balk, run and hide, but you are bigger and stronger than they are. It's a necessary evil in the life of indoor cats and we've all dealt with it. Now it's your turn. You CAN do it.