If you air conditioning isn't as cold, most likely that you will require regassing, typically part of an air condtioning check.....what it might drive out is where you are losing gas, and then the bills to replace the parts, may be as little as seals but might go on to pipepwok etc. After 5 years suspect there might be some replacaments apart from the Gas to consider. Hope it helps....nice to get it working for the heatwave in the summer rather than the frosts at the moment. Geordieman