Can I strongly recommend the ecowitt WH31? These are inexpensive 915 MHz sensors that integrate locally with Hubitat via the ecowitt gateway.
The gateway is about $30 (about $25 right now) and supports all manner of sensors (temp, pressure, humidity, soil moisture, leaf wetness - just an incredible plethora of devices).
As I mentioned earlier, after it is setup, the gateway integrates locally with Hubitat. In addition, ecowitt offers a free cloud service, which you don't have to use if you don't want to. I am only mentioning it because provides really good long-term data storage and graphing capabilities (which I use) in addition to support cloud alerts (which I don't use).
Sensors take regular AA batteries that last a very long time. Here's what the graphed out data for the last week for my kitchen freezer looks like (both temperate and relative humidity are plotted):
