The following are some basic installation instructions that our manufacturer (White River Hardwoods) suggests:
Installation of Hardwood Mouldings

Store inside of jobsite, off floor to keep dry.
Run heater or air conditioner to dehumidify job prior to and during moulding installation and finishing.
(Remember, concrete slabs and sheetrock mud all add moisture to jobsite.)
Allow mouldings to acclimate for [...]