I was called out to look at a "budget" inverter unit MovAir 12k Btu that wasn't cooling at all. The unit had no gas and outdoor unit had an obstruction in front of it. Found the leak, regassed and everything else looked fine including the service valves sweating. I thought job done, just check on indoor unit and it works 'a bit' with room temp at 27c and indoor unit only producing 22c. Everything seems cleanish. I seem to remember there was a limit could get the temp down when it was also hot outside. Could that be the case?