Go ahead and get it re-gassed. just had the Panda done, made a huge difference. Last weekend, trip to Crawley in the heat, just blowing cool. Today, still just as hot outside, but inside, very cold. Passenger had to put her jacket back on!
Re-gas will also check for leaks and replenish oil in the system. All the seals rely on this oil to keep them from shrinking, and the pump of course, needs it for lubrication. As you have lost some gas, (it oozes out very slowly, no matter how well sealed) you will have lost oil too, so running it on will eventually lead to leaks from every joint and a pump failure. A stitch in time....
My Panda is an 06, they recovered 69g of gas, replaced with 500g.
The fridge in your kitchen does not lose gas because it is all welded up. Not possible on the car.