Yeah. I live in a tiny studio though. Even then, sometimes I think I might need 2 because it gets so cold. But I did an experiment when I lived somewhere else where I went on vacation for about 5 days and I just let my S9 go in my office on the floor with no air circulation or anything, just opened up all the doors, and the whole apartment (900 sq ft 2 bed) was about 88°F when we came back. So it may just take a little while to reach those ambient temps. But also, I think 2 S9s is a good number for an apartment.