1. Invest in a 24K BTU mini split unit
2. Invest in a good dehumidifier with auto restart mode - first you calculate the daily transpiration of your plants (99% of the water you put into the system will be getting removed through the leaves). If you can do it, make a small hole in the wall and drive the draining tube of the dehumidifier out of your growing space so that you don't have to be emptying the dehumidifier every day.
3.No need for a hole in the wall to vent. Just put a big carbon filter on the floor and connect your exhaust fan on top of it.
4. Lots of fans inside the room to be covering thoroughly the space with air.
5. CO2 tank with a controller like the Autopilot.
6. Humidifier - preferably fogger ones. Then you can experiment with VPD to your liking. Connect the humidifer(s) to Son Off devices.
7. Cleanliness, cleanliness, cleanliness, proper IPM prevention. If you are not careful and experiment with VPD + CO2 (high humidity values), pests like root aphids are gonna fuck you up and propably it will be too late when you understand their presence. That's what happened in my case.
If you do it right, this setup is gonna pay off for the extra expenses from the first time. I wish I had gone like that from the beginning of my growing days.
Edit: * Seal the room as best as you can. If you are using organic soil mixes in a properly sealed room, CO2 tanks will be holding much longer than expected with other setups.
