I would go w/ Bobs advise,any pinholes in the duct & its better for them to be sucking air in than blowing it out.as for fans being better at pulling than pushing, it depends on the style fan, sguirrelcage types are better at pushing but PC fans are better at pulling.
Cooling issues
- Thread starter ZEN MASTER
- Start date
GooDvzEviL
Active Member
Hey ZEN!
I also have a 400W MH/HPS and since I can't cut anything here I decided to go with this... a 10,000 BTU Roll Away AC along with a couple fans.
Here's the link:
http://www.air-n-water.com/product/ac-10000e.htm
Hope this helps you out some with your temps!
Peace,
GooDvzEv1L
I also have a 400W MH/HPS and since I can't cut anything here I decided to go with this... a 10,000 BTU Roll Away AC along with a couple fans.
Here's the link:
http://www.air-n-water.com/product/ac-10000e.htm
Hope this helps you out some with your temps!
Peace,
GooDvzEv1L
KnowledgeSeeker
Active Member
I've heard quite a few times that if you get a portable A/C that the single hose type are not as good for growing as the dual hose type.
ZEN MASTER
Well-Known Member
that's some good info to know, so what's the difference in the two, other than the obvious.
PEACE!!!
-ZEN-
GooDvzEviL
Active Member
What up man... is that right? I've never heard that one... good lookin out man. I'll check it out once my room is fully constructed. (Actually I'll be starting a thread in the very near future--with detailed pictures.) The whole point here is to keep the temps down. and with 10,000 BTU's and two oscillating fans I think It'll be alright 
Peace
Peace
privateaero
Active Member
Before you buy anything pull your ac out of the window and pull the front grill off and clean off the evaporator. I'd do it in the bathtub with a shower head, just don't get the electrical wet. that is in case you haven't done that in the past 2 yeas. I'm running a 6000 btu with a 1600 watts of lights and the compressor is hardly ever on.
Now onto cool tubes, I just got a six inch for my 1000w and the airflow drop after it is insane. I'm running a 6 inch fan and 6 inch ducting. What i wish i would have done and am recommending you do is buy a cool tub one size up from the size fan your going to use and use adapters at either end of the cool tube.
Also there are many sites that have calculations on how much airflow you'll need for how many watts your running and how big of an ac
Now onto cool tubes, I just got a six inch for my 1000w and the airflow drop after it is insane. I'm running a 6 inch fan and 6 inch ducting. What i wish i would have done and am recommending you do is buy a cool tub one size up from the size fan your going to use and use adapters at either end of the cool tube.
Also there are many sites that have calculations on how much airflow you'll need for how many watts your running and how big of an ac
KnowledgeSeeker
Active Member
I think the main reason is because single hose sucks air in from the room and exhausts some of that air to the outside. This can create negative air pressure and you are also exhausting unfiltered air (odor control suffers) and possibly CO2 (if you are running CO2). See explanation below for more info.
Single Hose vs. Double Hose
There is a bit of a debate about whether a single exhaust hose or double exhaust hose system is more efficient when using a portable AC. Although the research is inconclusive, it is helpful to understand how single- and double-hose PACs differ.
- One-Hose PAC A single-hose portable air conditioner works by drawing in air from the space, cooling it, and returning most of the air back into the room. A small amount of this air will be used to cool the unit and will be blown out of the air conditioner's exhaust hose. This can cause your room to harbor slightly negative pressure. If you adjust for this pressure by drawing uncooled air into the room from adjacent spaces, such as from underneath the door or from gaps around windows, then your unit's cooling efficiency will be slightly affected.
- Dual-Hose Unit A dual-hose PAC works by taking in air from the outside through one of its hoses and using that air to cool the unit. Then, the hot exhaust air is expelled through a second exhaust hose. As such, a dual-hose unit does not create negative pressure inside the room being cooled, and it may be more efficient than a single-hose PAC. However, dual-hose units use warmer, unconditioned air to cool their compressors, which can result in slightly weakened efficiency. Also, depending on the design, a dual-hose PAC may use two internal fans, which results in slightly higher energy usage.
- Hot Temperature Consideration Another important point to consider when deciding between a single-hose and a dual-hose portable AC is the outside temperature. If you have a dual-hose setup, where the intake hose is pulling air in from outside when the temperature is high (say approaching 100°F), then the air being drawn in to cool the unit down may actually be hotter than the unit's compressor. Under this scenario, the unit may not function properly or it will be less efficient than if it was in a scenario where the intake-air was being drawn from inside the room, where it's cooler.
- The Bottom Line: The verdict is out. There are pros and cons to dual-hose units, and there has not been a definitive study to confirm their benefits over single-hose units. If you are uncertain about which unit to purchase, remember that some dual-hose units can be modified very easily to become single-hose units. All you have to do is detach the second hose using the instructions in your PAC's owner's manual.
willyjack
Member
Sorry I haven't returned a comment quicker,but...
I didn't see any pictures, as far as cooling is concerned, my AC window unit is really what keeps the room at it's temp. If I could unplug it I would. I've worked in the room with the door open and the next thing I see is the temp creep up.
I want to put in another ballast to increase my area, but I'm afraid I may screw up the room temp and what will happen to my electrical costs. I'm already spending $300/month.
I didn't see any pictures, as far as cooling is concerned, my AC window unit is really what keeps the room at it's temp. If I could unplug it I would. I've worked in the room with the door open and the next thing I see is the temp creep up.
I want to put in another ballast to increase my area, but I'm afraid I may screw up the room temp and what will happen to my electrical costs. I'm already spending $300/month.
ZEN MASTER
Well-Known Member
i know this is off-topic, but please tell me you are raisng more than on plant? hell, more than five even.