My wife keeps hearing an intermittent beeping sound. I can't hear it because my tinnitus prevents me from hearing some sounds and this is one of them. She believes it is coming from my home office which is where most of our electronic devices are located. I have eliminated most of the devices. I would rather not shut down my Hubitat system so I'm asking the question here.
No.
Do you have a UPS connected to your hub? That, or maybe a smoke detector in the same room, seems more likely. 
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Or a fireplace. Our fireplace controller can beep on occasion.
First thing I thought of was a smoke detector as well.
That is great...wanted to do that many times.
Yes there is a smoke detector in the room. Whenever it has beeped in the past I was always able to hear it because it is quite loud. I do have a UPS but it is not connected to the hub. However my wife insists it is coming from on top of the cabinet.
It might be the thing beeping.
I have personal experience with trying to find a beeping device. It turned out to be a smoke detector in a drawer under a towel that was beeping because the battery was gone. Vexing.
Finding ddsuch intermittent beeps can be challenging. The sound echos off the walls, floor and ceiling so ultimately you have to identify where the loudest sound is coming from. Every now and then, my cats get behind the AV center and knock the UPS power cord loose from the receptacle. The first time that happened, it took quite a while to find it. Now that is the first place I look,
If you can't find it, and your wife is sure she can hear where it's coming from, I'd simply shut down your Hubitat (to convince her it isn't the culprit, which it's not, it has no way of emitting any sounds/beeps) and then let her "find the beeper" when she hears it. 
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Funny side story about beeping things.
I was always the guy in IT that stayed way later than everyone else. Someone got a hold of a BUNCH of cheap clocks with alarms (the kind used in promo giveaways).
They decide to prank me by setting the alarms to various times well after everyone else was gone--but when I'd likely be around. Then, they put them in every dam*ed locked cabinet in the area.
I'm sitting there working away one evening as they each went off at different times--and continuing to beep for however long before they timed out.
Being high-pitched beeps, it was hard to even tell where they were stashed--but I quickly discovered they were locked in the cabinets.
At that point, I knew there wasn't anything I could do to shut them up.
And OF COURSE I couldn't let on that they were annoying af to my coworkers. So, I just tuned them out. After about a week, I actually barely noticed them. Some weeks later, one of the app dev programmers was working late and came over--they were like "what is all that beeping???" and I was like "what? OH, THAT beeping!".
Rofl. That was a pretty hilarious and long told story (one of many, tbh). Pretty sure I won that game hands down! 
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Do you have a parrot?
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Thanks to all who responded. I never did find out what was beeping. Whatever it was it was probably a low battery warning and the battery must have died because the beeping has stopped.
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You need to pursue this further. If the beeping was from a smoke detector or carbon monoxide detector and the battery is now dead, it will no longer protect you and your loved ones. Test each of your detectors and make sure they are functioning properly. Your home should have some wired smoke detectors with battery backup. They might still work as long as you have power, but they need functional batteries to work during a power outage.
I like purchasing such detectors with 10 year lithium batteries rather than replaceable 9V batteries. When the batteries reach 10 years of life, you replace the entire detector as that is the useful life of the detector anyway. Old detectors are not reliable.
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Agree, both from a safety perspective and from a "I really would like to know how this mystery ended" perspective. Frankly, the latter is way more important to me! 
