Not that you need another bird room, but if you insist....lol
I would paint or stain the floor and then let it air out.
We live in a 100 year old house. We do not have forced air, so glad we decided against it. lol We have hot water heat, so we use window units. We run four - five units in the summer and they are not bad at all. All of them are digital and run fairly quiet on low to medium settings. They maintain a nice temperature and don't look that bad at all. We remove most of them in the winter and it does not take much time at all...the only one we leave in is the beast we bought for our entire first floor. We just cover it in the winter. We only paid $500 for the unit that does our whole first floor, versus a split system that would have been very expensive and we would need at least three units installed.
I don't remember but think I heard the portable units were not as efficient, were more expensive to purchase, plus they take up floor space. I would not want one over a window unit....