Andy Hill wrote:
I gotta agree. Unless the room is extremely small, 900W into the
room would be better handled by the "normal" HVAC system.

It's about 14x14x8. The "normal" HVAC thermostat is upstairs so it
doesn't notice if we're baking in the theater room. Plus the cold-air
return duct is on the floor, so it doesn't pull the heat off the
ceiling.