Red Cedar particular well-suited for extremely humid areas because of its natural resistance to decay and insects. It has a lower R-value than White Pine and White Cedar
Whatever your choice there are several steps you can take to preserve the beauty of your log home. Designing your home with large overhangs (at least 50cm) and covered porches to shield it from the sun's rays is always recommended, It is better to use White Pine with large overhangs than spend money on more expensive logs with no overhangs.
Always use a quality finish that allows the logs to "breath". This permits moisture to escape and minimize checking. A good finish contains a UV guard and is long lasting - 3-4 years for southern, full exposures and 6-8 years for northern exposures