you may want to invest in an electric humidifier that has an oscillating fan, it can also be healthy for your breathing this winter....65F can go even lower at night....Vandas must have at least 80F in the day and 65F at night (a portable electric heater can come in handy at night)....you also can add a lamp for brighter light in the day and put it on an auto timer ....
I see cold spots on leaves meaning droplets of water that reacts with the sunlight gives leaves small dark polka dots, better spray them with physan20 to rule out fungi or bacteria
get dog but dont give up on your Vanda....I have a rottweiler and a white siamese blue eyed cat....the dog is very protective of the plants on my windowsill....but the cat nibbles on a leaf or two if the dog is napping
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