Please help with fine tuning an upcoming grow room build for a first time grow.

I know of a room and have a couple of issues that will be present which I am not sure on how to adress to make the process go as best as possible. I have attached two pictures to show what I have going on. The first picture is the layout of the room which is a walk in closet which will be sealed off. (will be sealed off around where you see the green line). Picture #2 shows the wall I am constructing. It will have two intake fans which will be 250cfm inline fans, the lower one will be the main intake which will have no ducting. The one above it will be the intake for the light I have. The light is a 1000watt sun coast hood with 8" ducts on it for cooling (am going to be using 6" ducting which I have put on couplers to make the ducting fit). The reason why I bought the hood with 8" ducts is because it supplied a larger surface of light (8ft x 8ft). The light will be a 'Eye Hortilux Blue' which has a 600 / 400 watt (cant remember which order but one is HPS and the other is MH, which the light is specified as a MH light.) This will be used for the whole cycle. The ballast will be outside of the room to aid in keeping cool. Will have a carbon filter for the exhaust to use during flowering. Also have a couple of home made Co2 generators (yeast and sugar) to put in the room. The exhaust will have a 250cfm fan (pusher) that will be attached after the light and at the end on the exit wall, will have a 500cfm puller fan. Have two 8" fans which one is a circulating fan (will be on the ground to help push the hot air up) / (does not move) and the other is a 8" oscillating fan which I am thinking of wall mounting.

This is a first grow and currently the room is at 87 degrees (well insulated room) with the light on at 35 percent humidity. The humidity is low and the heat is pretty high (having a high heat wave). With the room sealed off I am not sure how it will help (as far as the temperature / humidity goes) with the intake and exhaust in their also. How should I time the inline fans to keep the room cool (trying to stay around 75 degrees). (see picture 3 for rough picture of room set-up). Also I am thinking of putting in an air conditioner in the room to keep the temperature at the correct level and also a heater for the colder months. I was thinking of buying a portable air conditioner for in the room but not sure on the correct way as they also build heat, was thinking of directing the exhaust (if one comes with one???) to the exhaust of the room. The room is 100" by 48". And yes I have been reading around this site for some time but do not see any pages on timing the intake / exhaust. I was also going to run the oscillating fan in the room directly on the plants to aid in fresh air and also to strenghthen the stock.

Please help with the timing / and input on a portable air conditioner to put inside the room or possibly on the outside near the inake of the room. Will rep for your time!!! Hopefully the pictures are not too confusing (I am not very good with drawing pictures on my computer). Also hoping to have the room finished by sunday. THANKS in advance for the help. Not sure how to time the intake / exhaust to be beneficial for keeping the temperature in check and also keep the smell inline during the flowering process.

I was going to use some mylar in the room but was afraid of the hot spots. Thought of diamond film but am debating on it due to the hood being good for an 8ft x 8ft room, seems like it would be a waste of money?? The room is 48" x 100" x 96" tall.

get a ductless a/c unit,don't vent the room at all,keep c02 levels up at all times.use a monitor like sentinal. use the a/c to control the temp inside the room, you can also use the water as it is condensed from the air.

I will have to check out the Home Depot to see if they sell any ductless style portable A/C units. I have no room left on the wall I have built to fit in a unit.

As far as venting wouldn't it be required to bring in fresh and and take out the stale / stinky air?

Ductless unit are expensive and home depot doesn't sell them.

You have to vent your room. If you don't have an exhaust fan you will have humidity problems. I live in a place where it is so dry we install humidifiers on our HVAC systems. During the winter your skin will crack and bleed here without lotion. My flower room gets to 70% humidity without and exhaust fan during lights out.

TheBoozer said:

Ductless unit are expensive and home depot doesn't sell them.

You have to vent your room. If you don't have an exhaust fan you will have humidity problems. I live in a place where it is so dry we install humidifiers on our HVAC systems. During the winter your skin will crack and bleed here without lotion. My flower room gets to 70% humidity without and exhaust fan during lights out.

Click to expand...

you can get a ductless on ebay,9000 btu with everything shipped for under $500
plants breath c02 and exhaust 02, An a/c will add humidity to a room,especially if you drain the condensation into a bucket. I use a dehumidifier during late flowering when the lights are off to control humidity levels. having c02 levels up in a sealed room produceses much more denser buds.

I have finally built the room and added all of the inline fans and dict work. The room is easier to control having it sealed off with a good intake / exhaust. I have done some experimenting on cooling ideas and using dry-ice helps out a lot (turned off the intake and exhaust fans to keep the room sealed off). I put the dry-ice in a small foam cooler, then propped it up slightly. I then mounted the in room fan to blow into the cooler to channel the air to around the plants, the temperature was able to be kept at 78 degrees with just using a passive intake in the room (was at 88 degrees to start, which is way to hot). Dry-ice works well and would be beneficial for Co2 to the plants the downfall is that it costs $1.15 a pound which would take roughly .8 lbs a day to be beneficial for Co2, also would take a trip each day to the store to get more since you can't store the dry-ice. It would be great for someone who could make it or worked in a place that they could get some each day, for most people this would not work. (I am thinking of finding a used Co2 tester to measure the difference in the room to see what the PPM levels would be from dry-ice to the sugar / yeast set-up I am about to install in the room). At this point it looks like I will need to buy a air conditioner to put in the room to keep things cool then run ducting to rid of the heat from the unit. Thanks for the help