You will probably run the system quite a lot in the summer but you should also give it a good few minutes run at least once a month during the colder seasons. Took mine to chap I've dealt with for about 10 years with different cars. I bought this Note 2012 in April this year. He checked for leaks and pressure test etc found a tiny schrader-like valve had a slight seep, and renewed it, topped up the gas and it now blows really cold, where it was only cool. Cost £65. He is in Thanet, Kent.