I hear ya bud.
I have tested the following;
1. Running my set-up with inlet and outlet ventilation system
2. Running with inlet and outlet ventilation system + Dehuey
3. Running Dehuey without inlet and outlet ventilation system
And without a doubt,
Option 1 was by far the best in terms of control, ease of use and efficiency.
Option 2 is good but I can get the same results with option one with a lot less fiddling and electrical usage.
Option 3 is poor, and not something I would recommend.
You can control humidity (moisture in the air) by ventilation alone. Therefore operating a grow room with proper/adjustable ventilation is/or should be standard practice, no matter what lights you are using!
This means HLG's definitely have the advantage over HPS because, whereas you need to run aircon + ventilation in a room full of HID's especially on hot days, you would not encounter such a problem in a room full of LED's, that has a ventilation system, with a good air exchange capacity. This is but one of the advantages a decent LED system has over an HID system.