This is a good idea for the temp/humidity sensor. @Zbysia, since you're in Poland, you might look at the Misol sensors. They are supported via a community Ecowitt integration. I have one of the 433 Mhz gateways and 3 of their soil moisture sensors. No problem with signal when the gateway is in my garage, and one of the sensors is below grade at the back of my property. There's quite a lot between the two that would block the signal of a Z-Wave, Zigbee or WiFi device, but the low 433 MHz signal penetrats building materials very well.
Misol 433 MHz Temp/Humidity sensor
For the contact sensor, you might also find sucess with 433 Mhz, but that will require a bit of investigation to find the right choice. There are 433 MHz contact sensors on Aliexpress that come with a relay. You could potentially connect the contact points of a Zigbee or Zwave contact sensor to the output of the relay. Similar to what I did with the Yolink relay. However, I would be very careful doing that with the inexpensive 433 MHz relays that come paired with the 433 MHz contact sensors. A quick search showed there are many sellers, but they all seem to have a mains voltage input. Given the price of these, it's probable that the contacts are not isolated "dry" contacts. So if you cannot find a 433 MHz contact sensor and relay pair that includes a low voltage DC powered relay, then you might need to get more creative. You could do something like attach a standard relay to the output of the 433 MHz relay, so that you are assured you have "dry" unpowered contact points to close the Zigbee or Z-Wave contact for input to Hubitat.
