I will be buying a car soon (toyota aygo), the private seller said that everything is working but the 'air conditioning needs to be re-gassed'. He said it will only cost about £50 to get it done at a garage. Only cool air comes out.

I want a car that works for both cool air and warm/hot air.

Does this mean the air conditioning is broken?

And when I buy it and get it regassed, how long will the air con last? Do I need to get it regassed every year?

At first, I didn't even know that car air cons need to be filled with gas.

Should you guys recommend me buy it? everything else is fine, it is just this air conditioning which I'm worried about. I need to have a car with air conditioning in.