Air
Vintage Air here in Tampa has pretty good aftermaket systems. An installation into a early Mustang was just featured in a recent Mustang and Fords Magazine and the cost was just over a grand. There are alot of cars here that have the setup and I haven't heard any problems. Looks very clean both under hood and under dash. The winters here in Florida are great for cruising, high 70's and sunshine almost every day. But summer is like hell lol. I have air in my Cat but come to think of it, don't use it as often as I do when driving my main cars. Ive only used it a few times, I guess I'd rather have the windows open and arm out, but it's always nice to know it's there when needed.