As the title suggests my temps are getting a bit high during lights on, as high as 90º F (32º C) and as low as 70º F (20º C) during lights off. I'm not too worried about the 70ºF but am concerned the higher temps during the day might be stunting growth. I've got good air intake (125mm) and out (150mm) but my 2 x 600W lights are kicking off some heat. I've been looking at portable air con units but they're not cheap and even the smallest ones i can find are 8000 BTU which is total overkill and 2300W. My elec is high enough without running that!!

Both my lights have air cooled shades but I can't run the air through them due to using a light mover and the ducting drags them all over the place and doesn't allow the light mover to do its job.

What is a anyone else doing to cool their rooms?

Also my nute temps are around 27º C - is this a bit too warm? I have a good air pump in their and the system is flood and drain so I should be getting more than enough oxygen to the roots right? Besides I think if I can find a way to lower my room temps the nute tank will coll slightly anyway.


I also posted this in my diary here

Thanks in advance for anyone reading this.

TTF

hi frank

i use a air-con unit, got one from Q&B half price at 90 quid
it works a treat...you can pick your temps with it...
as for the electrickery ? mmmm the bill aint in yet

wee-willy

I gotta watch my lecy you see. Last year I was on a low estimated bill, probably much lower than we had been using outside my grow room for 2 years. Result was when they finally did a readin I owed them a couple of G. I say owed, I still do and have had to set up a payment plan. Since then I'm really trying to watch my usage, a to save money and b not to arouse suspicion.

Debatable that one mate

Although not ideal 90 degrees isnt that bad if you have good air exchange

Ive had temps in the summer nearing 100 degrees before and didnt notice much difference at all

But high nutrient temps are a problem

Freeze some bottles of water and place them in your nutrient to cool it

Owd

have your lights on at night when the temps have dropped and leccy's cheaper
mine are on 7pm till 7am

Thanks for all the suggestions all. switching my times was also suggested by Oen in my Diary. My theory has always been that there are more copper chopers about at night and they are more likely to use their heat sensing camera's at night too but I should be pretty covered on that with my Mylar and insulation anyway (touch wood).



I'll switch my dark period over to days tomorrow and see how it goes. I'll also bang some bottles of water in freezer in case nutes are still getting too warm. If that doesn't work I'll consider the air cooler or possibly even bite the bullet with the air con. It's just frustrating cause winter is coming and i probably wont have this problem in another month or so.

Thanks for all the input.

Assuming you've got a CF you should have something like 440m3/hr. That needs the L1 or high performance model and not the A1.(If you're using RVK or Ruck). You should source as much as possible of intake air from outside, which allows for less air flow.

Hi Daviie

Just seen your post. My outtake is a Systemair RVK 150 A1 and intake which come from outside is a Systemair RVK 125 A1. the RVK A1 is rated is moving 420m3 per hour but I realise this is optimum and the resistance from my carbon filter will decrease the flow too.

If you've seen my other thread you'll see that I am starting my grow again. Whilst I am waiting for the cuttings to root etc I might have to invest some more overdraft in an RVK L1 for the outgoing and move the RVK 150 A1 to intake.

Anyone want to buy an RVK 125 A1?

I think you're wise to invest as you say. You need around 440m3/hr and the 150 A1, with CF and some ducting, will deliver around 330 -340m3/hr.
The L1 will easily meet your needs.

you'll save power just running your lights at night, as you wont have to use so much heating (if you have a heater) during lights off. ive always done it that way, just seems the sensible thing imo