Should I be worried?

So, for the past while - I'd say about month - I've been seeing on-and-off instances of what appear to be clothes moths. The size and colors match up pretty much exactly, so there's almost no question about it.

What I *am* somewhat concerned about is if they're actively infesting. I'm in North America, around the midwestern region, and it's currently mid-summer; AKA, moth season, if I remember correctly. That reason, as well as me sometimes leaving my bathroom window open for air when it gets especially hot, makes me believe that this isn't an actual problem and that they're just getting in from somewhere outside.

It's not just one spot that I'm seeing them in - they're in the upstairs area most of the time (where my room and bathroom are), but we've also seen them in the main floor quite often as well, where we also have a large screen door that they are probably also getting in from. We don't have a messy house (far from it - we clean A LOT), and I take the liberty to use sanitizing spray all along my room and bathroom every few days (the medical kind).

Should I be concerned about a serious problem, or is it reasonable to assume that this is actually a non-issue that seeing clothes moths is a result of humidity + open vents? Just to add on, it's not like I'm seeing 10 a day or anything remotely close to that; the most in one day I saw was about 3, and then the next two days I didn't see a single one. They also are in my bathroom more often than my actual room, if that changes anything.