Cabnc
The Phalanaenthe group of Den,s like heat ( min approx.15 C - you may get away with a bit less) & light. I gather NC is Nth Carolina ?. To flower them in cooler climates you may even need to provide extra light for them especially in your winter period. Give them copiuos amounts of water & fertilise ( use your regime - (we fertilise 3 times per month & flush the compost on the 4th week ) whilst they are growing but reduce the water considerably in winter