Grow Room configuration -
Earlier in this journal I explained a little about my grow room and left a few things out.
I talked about the carbon filter suspended from the ceiling but never showed a pic. Here it is
You can see it needs a new outer filter.
So the air is puled through this filter with an inline fine on the other side of the wall. The fresh air is pulled into the room at the base of the door, through the plants and up to the filter hung from the ceiling.
Door vent bends in 3 places to prevent light leak from the next room.
On the outside of the room I have a small space heater plugged into a thermostat switch inside the room set at 70 degrees. The room is not heated so when the lights are out and the temp drops below 70, the space heater outside the room kicks on and blows hot air into the room. When the temp reaches 71-72, the heat kicks off. I don't have the reverse problem with auxiliary cool air, specially since I switched to LED which hardly generates any heat.
In my climate, this method with normal HVAC from the rest of the house being pulled into the room in all seasons works well to regulate my grow room temps, with just a little supplemental heat in winter. My room remains at 70-77 year round with nute temps ranging from 65-72.
Before I switched to LED I was constantly fighting extreme temps. I even tried an Active Aqua cooler to keep
the nutes and root zones in a good range, but the roots kept screwing with the circulation. LEDs have eliminated this issue for me.
I keep the air moving in the room with two Ozeri 3 speed bi directional oscillating fans (up and down, side to side). One of them has a remote which operates the fan on the unaccessible other side of the plants.