Ventilation and cooling

L

Liukang

New Member
Hey guys,

I built a small room in my uninsulated attic to hold my tent. The tent has the usually airflow with my inline fan and scrubber.

Room is 6x5x7 framed and insulated with rigid foam.

I installed ducting from the room next to it to refresh some air.

The problem I’m facing is ac. I’m using a single hose portable ac. Obviously my first mistake. I vented the heat exhaust outside of the tent which is creating negative pressure.

My question is should I move the portable ac outside of the room and just send the cold air into the room?

Currently it keeps the room perfect temp but pulls the walls in. I could possibly reinforce them a little more to stop it a little and pull more from the other room. This may actually be the best set up currently because it is cooling and keeping it good but I just wanted some opinions. Also it’s going to get really hot where I’m at in the summer so don’t want to overwork things. Efficiency is my key.

It has some airflow from the ducting of the other room but not much. I can’t buy a mini split or anything like that.
 
L

Liukang

New Member
coreywebster said:
What is considered really hot in summer?
Click to expand...
Southern border hot. Summers up to 115. The shitty kind lol.

It’s working fine now I’m just not a big fan of the negative pressure. If it pulls from the other room cool but I don’t want it to end up creating gaps in the insulation or door and pulling from the wrong area.
 
K

Khyber420

Well-Known Member
Liukang said:
Southern border hot. Summers up to 115. The shitty kind lol.

It’s working fine now I’m just not a big fan of the negative pressure. If it pulls from the other room cool but I don’t want it to end up creating gaps in the insulation or door and pulling from the wrong area.
Click to expand...
Have you taped/ glued the insulation seams? You can use a glue specific for EPS and tyvek tape, should make the insulation strong enough to take the extra stress.
 
Renfro

Renfro

Well-Known Member
With that AC in the grow room it is actually exhausting some of the air it is cooling. If you place it outside the grow and duct the cool air in you will stop that, you will want a passive exhaust up high so air pressure can equalize as the AC unit blows air in. You will have to account for the fact the AC unit will be reading the temperature outside the grow area.
 
L

Liukang

New Member
Renfro said:
With that AC in the grow room it is actually exhausting some of the air it is cooling. If you place it outside the grow and duct the cool air in you will stop that, you will want a passive exhaust up high so air pressure can equalize as the AC unit blows air in. You will have to account for the fact the AC unit will be reading the temperature outside the grow area.
Click to expand...
Thanks for the advice. I reinforced the walls a little better and all seams have silicone and tape over the top. I reinforced the door so it shouldn’t collapse in anymore. Temps are good and steady but the ac keeps having to run even when it’s 40 out. The room stays hot with all the lights still. I’m going to add the booster fan to run 25 on 90 off and adjust accordingly. Maybe this will help pull cooler air from the other room.

I’m thinking moving the ac out. Venting cold air in. Venting the whole room with my current inline fan and scrubber the same as the tent just extended outside of the room and adding a booster to the intake coming from another room. This should help equalize.

I have a temp control with the therm inside the tent where the plants get direct light so regardless of what the ac reads it only works for the tent. My only concern moving the ac out is how hot it’s gonna get in the summer. It’ll be pulling really hot air to cool and may have to work harder.


Thanks for the help. I’ll let you know how it’s working. This project has been super rewarding already. Contained concealed and getting efficient. Y’all on this forum have been a huuuge help.
 
You must log in or register to reply here.
Top