Dick, as the Crab and others have mentioned, continued practice and more practice is the key. I operate a 139 in one of the hottest countries in the world (+49 yesterday) and there isn't another helicopter I'd prefer to use. OEI is always a consideration when winching but with good SOPs and a well trained crew using real time information presented to the pilots, most risks can be mitigated. Hovering OEI is not normally an option in the hot summers here but is very often possible in the cooler months after burning off a bit of fuel.