Hey Rose I'm going to a single 5 gal with a air stone. Any ideas on keeping the rez temps down? .
The best range that your reservoir can be between is 60F-75F. Ideally the reservoir temperature should be at 65F because this level contains the most oxygen.
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I've got some tips and tricks for controlling reservoir temps...
First, insulating your res really helps stabilize the temps. Wrap mylar or insulation around it; I build my reservoirs out of ice coolers (attachment 1).
I used to put blue ice bags in the res if the temps started to rise, but I can no longer recommend putting ice in the root zone. During my last grow I did this, and the plant closest to where I put the ice definitely didn't like it; it ended up stunted and there was a bald spot in the root zone where the ice went. And as the root mass grows there's generally not enough room to stick ice bottles in the res anyways.
If you want to use ice to cool the res you might want to try the following ideas:
1. I jury-rigged some quart and half-gallon jugs using drip line and a drip-line shut-off valve (attachment 2). What I do is freeze them overnight and then stick the line in a hole on top of the res in the morning (attachment 3). This serves a few purposes: 1) provides a slow flow of cold water to the res throughout the day, so the roots aren't shocked by a rapid change in temperature; 2) keeps the res topped off; and 3) serves as a ghetto A/C for the grow area. The main disadvantage is condensation; I have to keep a rag under the jug to soak up water.
2. I built a semi-recirculating DWC for my latest grow (water pump is on a timer). Basically, I have a separate reservoir that is connected to my plant reservoirs via plumbing and a pump. I'm doing this for several reasons: 1) one thing I hate about DWC is that you generally have to lift the lid to do any maintenance in the res - a separate res allows you to easily do maintenance without disturbing the plant reservoirs; 2) I'm planning on doing a ScrOG - once the plants are in the screen lifting the lids becomes problematic; 4) more water means that things like temperature, ph, and nutrient concentration are more stable; and 3) if I need to cool the reservoirs I can put ice in the shared res without worrying about the roots. The main disadvantages are complexity, size of system, and more nute usage.
Some other ideas:
1. Put your air pump in a cool area. It seems like most people put their pump on top of the reservoir under the lights. If it is hot where you put the pump, then you're going to be pumping hot air into the res. I try to put mine outside the grow area if possible, or as close to the inlet as possible.
2. Direct some airflow from the inlet over the res using a fan.
3. If you use a humidifier like what Roseman recommends try directing the air from the outlet over the res using a fan. Acts kind of like a swamp cooler; I've found it lowers the temp over my res by about 5*.
Contributed from Dystopia
To get the temp down and the humidity up, try these:
You need a fan pulling heat out and a fan pulling cool air in.
You have to have an oscilating fan on the plants.
Lay wet rolled up like a cigar wash rags everywhere.
Hang a soaking wet bath towel on a cloths hanger and let it drip into a pan or bucket.
Put a frozen milk jug of water in front of a fan or let it drip into something by putting a pin hole in it.
Get a bucket, put ice in it or frozen water and blow a fan into the bucket, blowing cool air everywhere. And you can put Pine Sol or ONA in the bucket for Odor Control.
Put saucers and cups of water everywhere.
Mist the plants with plain pH water.
Put Frozen cups of water on the lids and everywhere around the plants.
