Create a E+ output variable with the sum of all Cooling coil rates

edit

If you cannot find a meter that fits your need, then find the Output:Variables you need, then create a Meter:Custom

Edit: based on comment below.

There are more than a few questions on this website that can also help in addition to the E+ I/O reference Guide I linked to.

Anyways, your MeterCustom isn't working because the 'Key Name' cannot be empty.

Assuming you have only two AirTerminals named "ATU 1" and "ATU 2", your meter should look like this:

Meter:Custom,
    Test,                    !- Name
    Generic,                 !- Fuel Type
    ATU 1,                        !- Key Name 1
    Zone Air Terminal Sensible Cooling Rate,  !- Output Variable or Meter Name 1
    ATU 2,                        !- Key Name 2
    Zone Air Terminal Sensible Cooling Rate;  !- Output Variable or Meter Name 2

Note that if you want to include ALL "Zone Air Terminal Sensible Cooling Rate", you can also try with a * (or any valid regular expression) for the Key Name (I haven't tried this myself. I know it works with a Meter:CustomDecrement, but unsure for Meter:Custom).

Meter:Custom,
    Test,                    !- Name
    Generic,                 !- Fuel Type
    *,                        !- Key Name 1
    Zone Air Terminal Sensible Cooling Rate;  !- Output Variable or Meter Name 1