AC too big.... What to expect.

[globel]

I have a 16x16 room I plan on running 8 1000 watt lights in. The lights will be air cooled in hoods. And the room is 100% sealed. It had a drop ceiling that we covered every tile of and taped up all the seems. Were using the existing buildings ac. It is 5 tons... My buddy works in HVAC and is running all new duct work only to this one room... I will be posting pics soon. Its a 14 foot ceiling and thats were all the vents are. Its going to really blow... At one point there is a 20" duct work.

My main question is, what should I expect when over shooting the AC so much. I know I will have to use the Dehumidifier more but what eles...I was thinking about running open bulb and grow some real TREES....

 

[B. Friendly]

you have enough room and ac to go more bulbs, my money is on extra light!!!! 14 bulbs is no problem for 5ton in my experience

 

[Lazyman]

you have enough room and ac to go more bulbs, my money is on extra light!!!! 14 bulbs is no problem for 5ton in my experience

You're missing a few variables here.

What are the ambient temps and humidity? Arid climates have several special considerations, and options for cooling (Coolerado.)
Are you going to run a gas-fired CO2 generator? They make lots of heat.
Why is there a 14" or 20" duct if you're using AC and not using air-cooled hoods?
Are the ballasts inside the room?
How many dehumidifiers will you have? I usually use 1 40-50 pint unit per 3 lights, or a Santa Fe for bigger grows.

To answer your question, an oversized AC will short-cycle, running very briefy, and then restarting again shortly aferwards. This causes more wear and tear on the compressor seals, which are often trying to start against a pressurized high side. This typically trips the thermal overload switch and the unit resets for a few minutes to depressurize. Over time this pressure equalizes, making it easy for the compressor to start again.

Whew, 14' ceilings eh? I'd go vert or at least stadium if you can pull it off, big yields to be had with those bare bulbs.

 

[B. Friendly]

You're missing a few variables here.

pull it off, big yields to be had with those bare bulbs.

he already has air cooled lights
and i am not really missing much. I would bet the farm he could add two to four bulbs easy. personally done 14 bulbs on a 5 ton flip ie going 24/7 on 14 bulbs.
a 3 ton could handle 8 bulbs.
the easy rule of thumb is 3 bulbs per ton.

 

[globel]

My investor is banking on what they have seen me done in the past. In the past I have never done vert.. So I think that might be out of the question.

ballast are out side of the room.

I will be using tank co2.

Running a 72 pint dehumidifier... If I need a second then i will get 2.

and the lights will be air cooled... I plan on using 1 10" maxfan for venting the lights.. The room is failry well insulated one side is a cinder block wall the other walls are 2 1" layer plywood sandwiched with 2 layer 1/2" drywall no insulation but there thick as fk. The ceiling is a drop ceiling so it fking sucks and i might vent the lights straight into the ceiling and not outside =0... Shhh the spot is inside a medical cannabis dispensary in California =X. So the weather sucks some times. Gets warm.

Also Every time i run open bulbs I can never get the plants close enough... =( I grow the kush usually but Might be growin some sativas because there hard to come by this time of year... The super top shelf ones that is.

Open bulb multi flow, 10 bulbs 50 pots? or perpetual 3 4x4 tables with 3 1ks each.

 

[globel]

Also I was only mentioning the Duct size to explain the size of air handler and what were talking about. There are 2 intakes that are 18" each and 4 out puts witch are 10" each. The air handler is in the 3000 cfm range...

Was wondering if any one had any input on thermostats. Any digital home thermostat should be fine,what do you think?

 

[globel]

This is a pic of the random supply's we got for the ac... I will get more tomorrow.



Also including some pics of the process of sealing the drop ceiling.

 

[arrg]

see if your friend can toss and unloader on the ac unit. A hot gas bypass would be able to be piped in just about anything but there are some power saving options too.