My dwc water temp is rising

In my dwc unit the water temp has risen to 74.5F. Could I put a small ice pack inside the bucket without hurting the roots? I am trying everything aside from adding a window a/c unit right now to cool the room the tents are in. The room temp is 73F the tents are on the concrete basement floor which is about 68F
8x4’ tent

4- white widow autoflowers

RDWC system 4 five gallon grow bkts

5 gallon reservoir

2 single dwc buckets white widow AF

1/10 hp water chiller( currently not in use in the rdwc that temp is staying around 65-68F without chiller now)




950 gph air pump

2”x4” air stone in each bucket

12” oscillating fan

1200w king plus led 24” from canopy

2-HLG Quantum 288 boards

6” 400 cfm exhaust fan and filter

General hydroponics maxi series

Ph level


Water temp 74.5F

Air temp 77.6F

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So, which is it? If your water temps are 75F then run the chiller. If they are running at 65 to 68 without then you don’t have a problem.

If you do run into issues you can put your reservoir outside of the grow space so it isn’t irradiated by the lights and heated to the same temp as the rest. Increasing reservoir size can help too.

Your reading into 2 different systems. I’m having a problem in the single 5 gallon bucket dwc which is 74.5F. My RDWC system which is in the same tent is holding between 65-68F which is what the chiller was hooked up to.

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Ice packs then. That or turn your bucket hydro into RDWC for that one too. Another thought would be a second chiller coil added to cool both.

I’m working on building a few single bucket and reservoir setups because my current rdwc is maintaining temp good. Was just trying to get by for a week until I get them built. Just wanted to make sure putting something that cold into the roots/water would hurt

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Nah; you already know to be careful of the roots. You have some additional leeway if you are using a product like Hydroguard too.

I built my setup and the reservoir came from our local automated car wash: 15 gallon drum of “foaming soap” that rinsed out easily and I modified for my use. It’s nice to have a reservoir to match the volume at the roots.