"For an acoustic, make sure the humidity is stable. Might also want to put a tad more relief in the neck (if the buzz is across a number of strings), or raise the saddle (depending on bridge type) if it is only one string."
Good point. Humidity is a killer for wood instruments.
I have a small bedroom where I keep my guitars that has a humidifier constantly running. Where I live we seldom have an excess of humidity so I find I do not need to worry about over humidifying the room. I also have a small heater in the room so the temp never drops too far in the winter and an air conditioner that keeps the temp from going too high in the summer.
Guitars cost too much to take many chances.