Thought this would be an appropriate topic since a deep freeze is moving throught the upper midwest. What is everyones take on controlling head pressure to keep freon from logging in the condenser during low ambient conditions? Whats the best way to accomplish this? How does everyone go about setting the holdback valve (A8 or ORIT)? Any particular brand of system or setup that seems to handle colder conditions better? And GO!.. . . . . .