Air Conditioning Question

[PHATBOYPIMP]

Yes I have used the search button.
Yes, it is true, I don't know **** about air conditioning.

I have a 2006 H2 with 34,000 miles and I am the original owner. Although I have limited mileage, they have been hard miles, nearly all of them towing a boat in high heat for long distances.

I have used my A/C constantly in 100+ degee heat on a weekly basis during the summer. It is clear that the A/C has become less cold over the last year and is struggling to bring the temperature down to a comfortable level.

It has been a while since I was cracking open engine blocks, but hasn't A/C technology advanced that this could be a more serious problem than just doing a "recharge" of the system? I thought the freon days were over.

Any advice would be greatly appreciated. I have had the flash done a few years ago because the passenger side only pumped hot air no matter what I set the temperature at. Is another flash an option?