I'm growing in a 4x4 tent in a 10x12 bedroom. I've done a lot to try and optimize the growing conditions in my space. Most of that time I just sit and stare at the system thinking about how the air was moving and what I could do to improve the efficiency of each of my components (air movement, humidity, temperature, light, and so on). For instance, I'm no HVAC pro but I do understand that every bend and turn you put in your ducting you'll loose efficiency. Any time I make a change I close everything up and watch the numbers on my controllers for changes.
I also keep a close eye on the temperature and humidity outside my house, inside my living space, in the grow room, and inside the tent. It sounds like a lot but it's really pretty simple. I have an indoor/outdoor weather station, I use the digital home thermostat readings, and in my room I have multiple controllers and meters to monitor. I can check everything in less than 30 seconds and I watch it all the time. So why do I do all of this? Well my system is vented and I make a lot of adjustments manually. It's not ideal but it works for me. If I notice ambient humidity is high outside and in my home, I turn on the dehumidifier in the grow room. If temperature and humidity are high I may adjust the settings on the house AC. I use all of the tools to try to keep things in the proper range for the growth stage of my plants.
I know they say this plant will grow like a weed, and it does, but if you rely on a superior product for a medical condition, or if you refuse to settle on anything less than the best quality you'll have to either put in the work like I describe or put up the cash for something that will take care of itself. I think that's why most people would rather just buy from dispos. I literally have to plan my life around my grows and that works for me.
