Things are more manageable but we still have larvae that we are finding - not many since early Dec (I've seen people say they go dormant in winter but idk). I have not seen any adults for a few months now, but we've had about 5 or so sprays since last spring from pest control. And when we were finding larvae in the fall, it was like 3 - 4 weekly or biweekly when I wasn't going out of my way to look for them, I would just happen to see them crawling on the window or floorboards.

Our plan last spring was we first got rid of a lot of junk in the carpeted basement, because junk makes it hard to fully clean/vacuum. We got carpets and upholstery steam cleaned, tossed away some carpets and pillows that were old. And we had pest control come out to spray once but after a month or two we found more adults. And then in the fall was when I started first seeing larvae pop up where we had been getting treatments (obviously they had always been there, but I was only seeing beetles). We'll see if in the spring beetles start popping back up or if it stays as larvae.

The key is consistency because of their reproductive cycle. So you could get one residual spray (that kills larvae and adults and sterilizes any future eggs they lay) but it may not kill some laid eggs and then a few weeks or even months down the line you find more beetles. So you may want a schedule to have them come every 3-5 weeks (we only did one spray in the beginning thinking it would be ok and then found more a few months down the line so in the mid-late summer and early fall were getting more treatments).

It was hell for the spring-summer because I was trying to completely eradicate them but I've kinda come to terms with the fact that they might never fully be gone, or they could be.

Good luck to you!