I checked and only my indoor weed (philodendron) was above a vent. Our heat is not as dry as natural gas or propane, we have geothermal, but I need to think of where to put that crazy thing. It was a gift that survived all this time.
I will post a picture later of what the roots of the palm look like. I will have to carefully cut the pot apart of get it out.
We have friends who keep the heat between 80-90 in the winter. Their plants thrive.