Evaporative cooling is limited to a ceiling of about 95F, really falls off after that. Probably best to get them out of your house and into a purpose made shed. Put it on your roof or a garage or an outbuilding made for that purpose.

You can also add insulating materials around the door to help with the noise.

But yeah, more airflow. Even at 47C there is still a large temperature difference to your GPUs and ASICs. Turn off the A/C, increase air flow. Consider purpose built structure outside with massive airflow.