A/c opinions

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Skeggöx

Active Member
memoponics said:
If you have good led lights and good air movement, just jack your humidity up to like 75% and forget the ac, especially if you are going to use supplemental co2. My room is similar but 8x10, in the summer it is consistently 87-91° and 73-75% in there. If i ran my ac it wouldnt cool it off that much but it would suck the moisture out of the air, and it always seemed like it was leaking the hot exhaust when i ran it. I have a 10,000 btu portable LG but its unplugged in my veg room right now. I just follow vpd charts for the temps i have and adjust humidity and light intensity accordingly. It feels hot and muggy as fuck in there to me but it also seems to me that the plants like those conditions; the leaves pray like a tv evangelist. If you mind your vpd high temps arent really that scary. Once theyre acclimated, its really only when you get drastic environmental changes up or down from there that you risk problems and have to make adjustments so you dont stress them or get mildew or bud mold.

I dont know how well this works with HID, so if you dont have LED youre a fucking caveman and i hope you fry your shit! lol jk

Invest in a good heater for the winter instead of an ac for the summer. I love growing in the summer. If you run led you have to pay for this kind of heat during the winter.
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Well I'm a fucking caveman cause I'm running 600w hps lol. Well MH currently, still in veg. What's the hottest temp you can flower at? I assumed I would need ac at that stage. My average temp is the same range as yours. Maybe 93 occasionally, Humidity 65-75%
 
C

ComfortCreator

Well-Known Member
Well you are pointing out another possible solution too. HPS in Winter and a LED board you can run through the warmer months.

With a chinese knockoff you can get a 600w board for a few hundred + a driver. You may even be able to run both at certain times.
 
memoponics

memoponics

Active Member
Skeggöx said:
Well I'm a fucking caveman cause I'm running 600w hps lol. Well MH currently, still in veg. What's the hottest temp you can flower at? I assumed I would need ac at that stage. My average temp is the same range as yours. Maybe 93 occasionally, Humidity 65-75%
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Mine has gone as high as 93° 77% when the outside temps are in the 90s. I watch my leaves like a hawk, its the first indicator to how your plants are reacting to changing conditions. The leaves can get a little edgy when it goes that high, i usually just pull my lights up a little, maybe dim them 10%. When it drops out of that high range the leafs start to sag a little so i try to bring the heat up, 1st by turning the light intensity up or lowering the light closer to the canopy, if that's not enough i kick on the heater.

HID is fine for you if those are your lights on temps and not just how hot it gets in there during the day with the lights off. I was just kidding about led, im a convert and i think everybody should convert for a lot of good reasons but it can be cost prohibitive. Youll get really good leaf surface temps with hps, just have to keep the other parameters in check. Its the interplay of temp, humidity and light intensity that make it safe to grow in those temps. Look up some vpd charts and they will show you the safe ranges for most temps under 95°. The only thing they dont help with is light intensity, you kind of have to play with that on your own.
 
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Skeggöx

Active Member
memoponics said:
Mine has gone as high as 93° 77% when the outside temps are in the 90s. I watch my leaves like a hawk, its the first indicator to how your plants are reacting to changing conditions. The leaves can get a little edgy when it goes that high, i usually just pull my lights up a little, maybe dim them 10%. When it drops out of that high range the leafs start to sag a little so i try to bring the heat up, 1st by turning the light intensity up or lowering the light closer to the canopy, if that's not enough i kick on the heater.

HID is fine for you if those are your lights on temps and not just how hot it gets in there during the day with the lights off. I was just kidding about led, im a convert and i think everybody should convert for a lot of good reasons but it can be cost prohibitive. Youll get really good leaf surface temps with hps, just have to keep the other parameters in check. Its the interplay of temp, humidity and light intensity that make it safe to grow in those temps. Look up some vpd charts and they will show you the safe ranges for most temps under 95°. The only thing they dont help with is light intensity, you kind of have to play with that on your own.
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I was unaware of a vdp chart appreciate it. And yeah, those are lights on temps. I did have to back my light off. I kept reading 18in is optimum hight. It was too much for mine its at like 22
 
S

Skeggöx

Active Member
I raised it to 24" the morning I woke up to them curled as fuck. Slowly letting it back down. I just started studying the cultivation side about 7 weeks ago
 
memoponics

memoponics

Active Member
Skeggöx said:
I was unaware of a vdp chart appreciate it. And yeah, those are lights on temps. I did have to back my light off. I kept reading 18in is optimum hight. It was too much for mine its at like 22
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Theres lots of threads on vpd, or vapor pressure deficit, around here, lots of videos on youtube too. Its all about balancing and stabilizing certain room parameters and keeping them within certain ranges. For instance, temp rises, you adjust humidity up with it. Leaf surface temp and therefore light intensity also plays into it. It kind of even allows you to anticipate certain issues as conditions change, helps you stay on top of it. VPD in a basic sense, is about maximizing transpiration, which maximizes uptake. It is a ratio between under canopy temp, canopy temp, leaf surface temp and relative humidity. It boils down to a single number that defines the ranges of conditions you can grow in for various stages of growth. That number can be achieved with a variety of temp or humidity levels that might occur in most peoples rooms. The process can be completely automated if you can throw money at it, but i prefer to be my own automaton.

It should be noted that uptake can be very high at these temps, and i found that i had to adjust the strength of my nutrients down because the first time i did it this way i got a smidge of tip burn.
 
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