Would A 600w HPS warm up a concrete shed

Rite lol,,,,,,, my mum has handed me the shed to do what i want ..

Im wundering about venting.


My BRICK shed is not insulated and is about 8ft x 6 ft, n 9 ft tall. I live in the UK so it rarely gets hot. im only going to be using 1 600w for about 5 plants so ill only be using a small amount of room in the shed.

can i just get a normal fan that keeps air circulation going because as far as i can see, the heat from the HPS will be quickly lost as it diffuses into the large area. annd b4 it has chance to build up it will be lost through the walls...................... and thoughts???????


and how many plants would i be able to get with the 600w thanks in advance :

Are there any windows in this shed? Any type of insulation? If not you could think about adding some type of water drums that would absorb the heat put off by the lamp during the lights on period and then emit it at night.

mogie said:

Are there any windows in this shed? Any type of insulation? If not you could think about adding some type of water drums that would absorb the heat put off by the lamp during the lights on period and then emit it at night.

Click to expand...

No, there are no windows in my shed

... but there is no insulation either

Just 1 brick thick... so heat shud be lost easy enough right????

Think of this as adding passive solar to your shed. The barrels of water would absorb heat during the day or hours when your light was on. During the night or when your light was off the barrels would release that heat back into the room. At least in theory that works. I don't know how warm of cool your room gets. But that is the bare bones of passive solar.

Thanks mogie +rep

YOU will still need fresh air to come in and old staleair to go out dead stale air can cause many issues so venting is for more then heat its for the plants survival it needs new air brought in.

If you have a fan pulling out the stale air there should be enough cracks that fresh air will be drawn in. Just need to come up with a good exhaust fan.

ya see thas my problem. i dont realli wanna go cutting big holes outta the shed ...


................there is however a small 15cm x 30 cm vent made of brick (the sort of thing you have at the top of every room in oure house...look around u will see one right now lol )... i suppose i could force the air through that... the problem is that there isnt THAT much room for alot of air to escape............

Well you have to get that old/stale air out. If that is the only way then that is what we have to work with. Can you slightly enlarge that opening? Say to 4 square inches? I understand you don't want to cut holes but if it's enlarge on hole that is already and this would be soooooo handy.

stay online lol.... ill try and get a pic of something simalar off the internet m8

That opening sounds big enough to put a good fan in. I would say a 265cfm fan will do the trick. Happy growing!

ight m8 this is what it is .. but built into the wall itself.

I'm a Newbie to this site, but not to building, construction and/or improvising so I feel that I could offer my opinion. First, concerning heat, I'm sure that won't be a problem. On the contrary, it will probably help your shed be less dank. If in doubt, set up your lights, leave on until the temp.stabilizes and take a reading prior to growing. Second, concerning air circulation, I feel the hole/vent you have can be adequate with a good exhust fan. You'll need to have an airtight seal from the fan to the vent hole, Good Luck!

Is the roof block too. Roof vents are not that hard to install. Keep in mind that the block has an r-value of about 1. If ambient air temperature is higher than the room temperature it will heat the room. You should add insulation to the room especially if you are going to use it year round. If you added Styrofoam insulation to the walls this would also help with that dampness. VV

This is a huge long shot, but I used to have a brick shed, and me and my brother found a couple loose ones. They easily pulled right out. I would just try and feel all the bricks, perhaps you will find a loose one. This would make an exellant exaust, or intake fan. Also you could use some dry ice for heat issues, this would also give you good Co2 which will speed your grow up. Im pretty sure dry ice is inexpensive, just not sure where you would get it.
Grow on buddy : ) Also if you mylar the walls, or paint them white, this will help reflect the light, instead of turning it into heat. Help keep the temps down.

O and another thing, when you said you plan on growing 6 plants... are you going to plant 6 seeds, or are you getting 6 clones. As you know 50% chance of getting a male, so If you want 6, I would plant 10, just to be safe yakno? Goodluck : )

Buy youself a whirlybird for the roof and all will be solved

whirly birds dont usually work.I have 4 in my roof and my attic will still hit 112 on an 80 degree day

lol : well ill be getting probably 2 clones.... doin 1st grow with them... then taking a few cuttings from them ....

and ive checked for loose bricks and there is none. ill just have to use the small vent i have sumhow for air circulation.

and yea the roofs out of concrete so i cant put one in there either


buuuuuuuuuuutttt cum to think of it i suppose i could chisel away at the mortar of a brick and loosen 1 up and use that for circulation .
but would the strength of the shed be comprimised :S:S

Thanks people

no you could easily take out a brick without compromising the strength. If you do this, when you put the fan in, I would reccomend painting it the same color as the bricks to avoid any suspicion. A\

ok do like you said knock out a brick or two, Then get down to B&Q and by your self another airbrick

http://www.diy.com/diy/jsp/bq/nav/nav.jsp?isSearch=true&fh_search=air+brick&selected=products

Take your pick and get one that suits you but not the Z-brick as this needs to be fitted when laying/building