Potential cooling issue

[DogterB]

Hey guys! I'm in the process of setting up a small grow in a spare shower stall. I have lined it with mylar sheets and have an HLG 100 V2 light. I haven't started my seeds yet as I have been messing with the environment to try and get the temps in the bathroom lowered. Problem is that I live in a mobile home and it gets hot as hell in there. With the heat lately, my central air can't keep up and I've had to supplement with a window AC unit at one end of the house, opposite of the grow bathroom. The bathroom has a very narrow crank open window that doesn't open which I have covered to reduce sunlight/thermal heat coming from it. The air flow from the AC is pretty pathetic, but there is some. I have put a mini fan into the vent in the adjacent room to help push air through the duct into the bathroom, and I put a small box fan on top of the vent in the bathroom to help pull air from the duct and push it into the bathroom. I also have 2 small fans in the stall itself. I have two temp/humidity sensors a friend let me borrow, I don't know how accurate they are but seem fine. I've been running my light with all the fans and such going so I can get an idea of what temps are maintained. I've ran it the past two days when it's been over 90 degrees outside, and in the bathroom has been getting up to the mid to upper 80's during the hottest parts of the day. At it's coolest it's in the low to mid 70's.

So, these temps are a little high, right? Any ideas on how to help cool the room? I'm hoping this is a short-term problem that will ease up when the outside temps start coming down. This will be my first time attempting to grow and I'm just nervous to start if I can't maintain proper temps. The shower stall is completely open at the top, and I've had the door partially open to allow air to come in, with a fan in the doorway to help blow air in and up. Any advice/ideas/criticisms are appreciated, just trying to get my shit together so I don't end up as a first-timer fail story. Also, I'm growing autos and only one at a time for now, if that helps. Thanks!

 

[MIMedGrower]

You have to exhaust the heat out of the room and out of the trailer. I used a stealth exhaust board over a cracked open window in mine.

Got to be creative. Here is a good article.

Air Circulation & Exhaust Tutorial | Grow Weed Easy

Give your cannabis plants just the right amount of breeze indoors, and learn how to easily make a cheap, stealthy exhaust system...

www.growweedeasy.com

 

[DogterB]

You have to exhaust the heat out of the room and out of the trailer. I used a stealth exhaust board over a cracked open window in mine.

Got to be creative. Here is a good article.

Air Circulation & Exhaust Tutorial | Grow Weed Easy

Give your cannabis plants just the right amount of breeze indoors, and learn how to easily make a cheap, stealthy exhaust system...

www.growweedeasy.com

Thanks MIMed! I will try to work on that window today and see if I can't get it to open. Only thing is that it faces East and in the morning the sun is just blazing through that little window. I do have the door to the bathroom propped open, as it is the bathroom where the cat's litter box and food is. I imagine that the heat gets out that way, but probably not enough. I have the air vent in the next room closed to help more cool air enter the bathroom, should I open it? It is right next to the door to the bathroom, but the fan I have on the vent in the bathroom blows towards that door. The bathroom with the fans stays a little cooler than the adjacent room with the vent closed.

 

[MIMedGrower]

You need to bring cool air in low and exhaust the heat high. The stealth window with the blinds in the article i posted should help.

Stable environment to go with a good grow light is needed for good results.

Does the bathroom have an exhaust fan with a vent outside. Could maybe utilize that?

 

[DogterB]

You need to bring cool air in low and exhaust the heat high. The stealth window with the blinds in the article i posted should help.

Stable environment to go with a good grow light is needed for good results.

Does the bathroom have an exhaust fan with a vent outside. Could maybe utilize that?

I kind of do have it set up to allow that. The box fan on the vent blows low across the floor towards the shower, and I have a small oscillating tower fan in the shower blowing horizontally on the floor and a 9" circle fan in the shower doorway (glass door) blowing upwards towards the light. I initially had the circle fan hanging from the door blowing over the top of the light, but it keeps the temp down more when it's on the floor blowing up.

And unfortunately, no exhaust fan in this bathroom. I see what you are talking about with the window/blind setup, that could do the trick. Since it is an open top shower stall, I have no exhaust or ducting, I would just put a fan in the window to blow out? I'm pretty sure that this will only be a seasonal problem, and that once the outside temps start to get lower it will help. It just sucks trying to keep heat out when you live in a tin box made in the 70's.

Another option I have been thinking over is that I have a hexagon shaped greenhouse stand that I was originally going to use (13" sides, 23-25" side to side and diagonal). I opted against it as the shower is a 2'x2' square bottom and would be easier to work in. I could wrap it in mylar and put it in a different room, next to a central air vent. Use that until the bathroom temp gets to be more maintainable then move my pot to the shower stall? That room is a spare/guest room and has a full size working window. I keep the vent closed and the door shut, but it is much easier to cool when needed. My long-term plan is to get some experience with a few grows, then invest in a tent to put in that room and exhaust through that window.

As always, I appreciate your time!