Dear KN, Your questions is very common for Chimney Balloon users, and I can answer it from my own experience with our living room fireplace as well. Uninstalling and installing the Chimney Balloon in smaller gas log fireplaces is really very easy so it doesn’t hinder your ability to use the fireplace seasonally at all. The first install usually has a bit of a learning curve to it, but once you do the install you will have a method down pat on how to do it again.
Personally, I have found using the Chimney Balloon has me clustering my fireplace uses in the winter. For instance...I will tell my kids and wife that when we put up the Christmas tree I will uninstall the chimney balloon and we will enjoy using our fireplace for those festive weeks before the holidays come, and I will just use the old damper during those weeks. After New Years the tree comes down and the Chimney Balloon gets reinstalled in the fireplace, and then I know it is sealed up tight again. This allows everybody to get their fireplace fix for the year, and I am only doing one install and uninstall. Sure the living room is a little draftier during that time when the balloon is out, but it also helps me appreciate the difference when the Chimney Balloon is installed and saving me on the heating bills.
I hope this answers your question KN. Let me know if I can help further. - Jason