BLE client. How to subscribe for multiple notifications?

Slight progress as I was able to chain two characteristics, but only the second one showing co2 values is doing something. The first one is supposed to show temperature, but seems it is not reached as I only see co2 values. I've read up on JS promises but haven't found out how to receive and show several values.

  NRF.connect("F5:CB:47:42:E3:BB public").then(function(g) {
    gatt = g;

    return gatt.getPrimaryService("07e1f0e2-b68f-4f71-8bfc-19b3b0427b68");
  }).then(function(service) {
    return service.getCharacteristic("5d75d722-fce9-471b-93e2-6c625ef6d634");
  }).then(function(characteristic) {
    characteristic.on('characteristicvaluechanged', function(temperature) {

      temp = temperature.target.value.buffer;
      temp = (temp[1] * 256 + temp[0]) / 100;
      console.log("Temp: ", temp);
    });
    //return characteristic.startNotifications();
    return gatt.getPrimaryService("07e1f0e2-b68f-4f71-8bfc-19b3b0427b68");

  }).then(function(service) {
    return service.getCharacteristic("5d75d723-fce9-471b-93e2-6c625ef6d634");
  }).then(function(characteristic) {
     characteristic.on('characteristicvaluechanged', function(co2) {
 
      co2 = co2.target.value.buffer;
      co2 = (co2[1] * 256 + co2[0]);
      console.log("co2 : ", co2);
  });
      return characteristic.startNotifications();
  }).then(function() {
    console.log("Done!");
  }).catch(function(e) {
    E.showMessage(e.toString(), "ERROR");
    console.log(e);
  });