Air conditioning?

We are going to be having some hotter days this weekend....and our house gets to be like an oven mid day....my LO is just a week and 4 days....am I able to turn on the AC with a newborn?? Its just a small window unit in the living room....normally we have two and keep them on 24/7 lol . its one of the ones where I can adjust the temp too...so it can b set to a not so freezing temp. Advice?