I use Dektol at room temperature - 68 to 70 degrees.
I have never noticed much difference in a few degrees variation. It would likely be most noticeable if it got too cold.
You can not use all paper developers on a higher temperature but most of them is not a problem.
AM6006 (Amaloco) in fact an equivalent of the Ilford MG paper developer is running at 30 degrees C in an ACP252 (2X 30 seconds, AM6006 and X55 (fix)). At room temperature you need at least 1 minute (RC/PE).
The biggest disadvantage to use chemicals on higher temperature is their evapouration but in a machine or Nova this is not a big issue.
Fortunately with the airco I can cool down to 22 degrees C in summer but this is not Australia. But this summer I could do an 'on the fly C41 development' outside