room temperature?

[gotyoganja]

hey everyone thanks in advance for the help. My room is getting to about 93 deg during the day,and leaves are showing heat stress, but if I check the temp in the shade, like by leaving a piece of cardboard over the thermamador, the actual temp of the room is around 88 which is where I want it. Now, Is the temperature of the room suppossed to be 70-80 actual temp, or is the temperature okay at 88 in the shade. FYI It doesnt feel that hot in the room, but with the digital termamador, im not sure if the light is heating up the plastic casing when its left without shading, giving an inaccurate reading...you know? otherwise i dont know what else to do to drop the temperature...kinda frustrating. 400w bulb, its about a 3x 3x x6 and I have a fan pulling air out the top, have a small fan on the floor pushing air up toward the top fan, and one more fan on the floor, outside the room, for fresh cool air. walls are lined with foil on all four sides. thanks again for the help guys/girls

 

[mattisreal420]

hey everyone thanks in advance for the help. My room is getting to about 93 deg during the day,and leaves are showing heat stress, but if I check the temp in the shade, like by leaving a piece of cardboard over the thermamador, the actual temp of the room is around 88 which is where I want it. Now, Is the temperature of the room suppossed to be 70-80 actual temp, or is the temperature okay at 88 in the shade. FYI It doesnt feel that hot in the room, but with the digital termamador, im not sure if the light is heating up the plastic casing when its left without shading, giving an inaccurate reading...you know? otherwise i dont know what else to do to drop the temperature...kinda frustrating. 400w bulb, its about a 3x 3x x6 and I have a fan pulling air out the top, have a small fan on the floor pushing air up toward the top fan, and one more fan on the floor, outside the room, for fresh cool air. walls are lined with foil on all four sides. thanks again for the help guys/girls

70-80 degrees is where you generaly want to be at, but my temps get to 90 sometime with no visible problems. Your fan setup sounds good, but one thing you could do is have a fan blowing up by, right under, or twords the light to disapate the heat a little. Try this and see if this helps...sorry coulden`t be more helpful. Good luck

 

[northwoodsmoker]

that temp is way to high add more fans if you need to.. my temps stay around 80-85f that too high also..

 

[moash]

hey everyone thanks in advance for the help. My room is getting to about 93 deg during the day,and leaves are showing heat stress, but if I check the temp in the shade, like by leaving a piece of cardboard over the thermamador, the actual temp of the room is around 88 which is where I want it. Now, Is the temperature of the room suppossed to be 70-80 actual temp, or is the temperature okay at 88 in the shade. FYI It doesnt feel that hot in the room, but with the digital termamador, im not sure if the light is heating up the plastic casing when its left without shading, giving an inaccurate reading...you know? otherwise i dont know what else to do to drop the temperature...kinda frustrating. 400w bulb, its about a 3x 3x x6 and I have a fan pulling air out the top, have a small fan on the floor pushing air up toward the top fan, and one more fan on the floor, outside the room, for fresh cool air. walls are lined with foil on all four sides. thanks again for the help guys/girls

ideal temp should be like 75
i dont know about this personally but i have heard that foil is a NOT good reflector

 

[hanimmal]

My room was almost exactly the same way.

I got a 20" fan put a 6 inch duct that inserted into a box and taped the piss out of the back with ductape and plastic to create the vacuum to suck the cooler air in, and another to send the hot air out (into a carbon filter, if you don't want to spend the money there is a great odor control thread with some very cheap alternatives for them) and my room went from being around 100 degrees (F) to about 78 degrees (F).

https://www.rollitup.org/grow-room-design-setup/63004-my-3-carbon-filter.html

My plants have since exploded and I only have to water about 1 time a week now. Also from what I have read the high heat will make a difference when you start the flowering because you want the room to get cooler when it goes dark.

Hope it helps.

 

[SunnyDaze]

you are way to hot there dear.

 

[SunnyDaze]

ALSOOOOO

is the foil lined with the shiny side facing into the room (yes, there is a shiny side and a dull side to foil)

The shiny side reflects the heat, that is why when you cook with it, you always put the shiny side towards the food.

To be honest, I would eliminate the foil all together and just opt for white paint that reflects the light. Probably take care of some of your problem.

 

[kotten148]

I recently just started my first grow and my grow room temp was way to high. Around 90 during the day. I had to just suck it up and buy a small 80 dollar window AC unit. I funneled the air from the ac directly into the bottom of my grow tent. My temps are 73-77 during my light period and 65-70 at dark period. I also have a timer on my Ac unit so i conserv energy. Just do it man.

 

[BLAZEKID]

get a roll of mylar for $20

 

[ROBINBANKS]

bis Growing Guide

Proper temperature is one highly variable factor. Most books state optimum grow temperature to be 70-80 degrees, but many list extenuating circumstances that allow temperatures to go higher. Assuming genetics is not a factor, plants seem to be able to absorb more light at higher temps, perhaps up to 90 degrees. High light and CO2 levels could make this go as high as 95 degrees for increased growth speed.* An optimum of 95 degrees is new data that assumes very-high light, CO2 enrichment of 1500 ppm and good regular venting to keep humidity down. It is not clear if these temperature will reduce potency in flowers. It may be a good idea to reduce temperatures once flowering has started, to preserve potency, even if it does reduce growth speed. But higher temperatures will make plants grow vegetatively much faster, by exciting the plants metabolism, assuming the required levels of CO2 and light are available, and humidity is not allowed to get too high.
With normal levels of CO2, in a well vented space, 90 degrees would seem to be the absolute max, while 85 may be closer to optimum, even with a great deal of light available. Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth.
Low temperatures at night are OK down to about 60 degrees outdoors, then start to effect the growth in a big way. Mid 50s will cause mild shock and 40s will kill your plants with repeated exposure. Keep your plants warm, especially the roots. Elevate pots if you think the ground is sucking the heat out of the roots. This is an issue if you have a slab or other type of cold floor.
As temperature goes up, so does the ability of the air to hold water, thus reducing humidity, so a higher average temperature should reduce risk of fungus.
Contrary to many reports, high humidity is not good for plants except during germination and rooting. Lower humidity levels help the plant transpire CO2 and reduce risk of molds during flowering.
Studies indicate the potency of buds goes down as the temperature goes up, so it is important to see that the plants do not get too hot during flowering cycles.
* D. Gold: CO2, Temperature and Hum
__________________

 

[ADTR]

I'd say your temp is too hot, I'd aim for around 75 give or take. Also foil is not good to use! It crinkles up and reflects light at oblique angles. I use 1mm thick mylar.

 

[Roseman]

Temperatures, Humidity
permalink

The temperature is the hardest factor to take control of to me. When confined to a small space, ballasts and lights can push temperatures sky-high in no time flat. That is why I use CFLS, to avoid venting heat. This is especially true during hot summer months when outside temperature reaches its highest. Nighttime (LIGHTS OFF period) temperature can be just as difficult to regulate during cold winter month. Most gardeners are aware that temperature in the grow room plays a major role and can greatly affect the growth of plants and the quality of the finished crop. Most gardeners do not know how controlling the temperature of their garden in very specific ways they can achieve a superior crop. Drift to far from these ideal temperatures and watch your plants and crop suffer.
Before getting started it is highly recommended that every indoor garden has a max/min thermometer. (Digital $4.95 at Walmart)

This product allows the gardener to see exactly the fluctuations in temperature within their garden. Without this useful tool there is no accurate way of knowing the different temperatures between daytime (lights on) and nighttime (lights off). The difference between the two temperatures is very important to plant growth. Anymore than a 10F-15F difference between daytime and nighttime temperatures and you risk shocking and stressing the plants. You want a 10 degree difference between LIGHTS ON and LIGHTS OFF temps. In general the optimal daytime temperature for plant growth is between 70F -75F. Drift to far above this range or too far below and growth can be severely affected. Daytime temperatures exceeding 90F or under 62F and plant growth will be slowed and stunted. Plants do thrive in afganastan's 110 degrees, but they quit growing at that temp. If the temperature drifts higher than 95F the plant’s enzyme production will drop off and the plant will begin shutting down. At temperatures above 92 - 94, high photosynthesis shuts down due to the stomata in the leaves closing down to conserve water. At normal temperatures the stomata will be open, taking in CO2 and sweating water to keep the plant cool and allowing for transpiration.
Ideal temperature varies depending on whether or not CO2 is being introduced to the environment. A more suitable daytime temperature when the air is being enriched with CO2 is 80F-85F. This temperature range promotes the exchange of gases between the plants and the environment. Also, it can speed up the process of photosynthesis. Plant in an environment at 86F can perform carbon extraction from CO2 twice as fast as at 68F. It is still recommended that the nighttime temperature drop no more than 15f from that of the daytime temperature. There is another relationship between temperature and the absorbsion of gases by plants that many hobbyist growers are aware of. That is the relationship between the temperature of the water in your reservoir and the amount of oxygen the water can hold. 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. Also this temperature will help control transpiration (the act of drawing up nutrients by evaporating water through out the leaves), and humidity levels. Buying a simple aquarium floating thermometer will allow you to know where you fit in this range.

$2 to $4 at Walmart, Target,
PetSmart Aquarium Dept





Another great reason for regulating the temperature in your grow room is that biological processes can be speed up exponentially by every degree. This is true for your plants as well as the potential pests that may invade your grow room.
Pests such as spider mites can reproduce up to 10 times faster with every degree the temperature rises.
These pests can destroy a garden in no time flat, you really do not want to make it any easier for them. Spider Mite Eggs and webs can screw up the buds so bad, they can nto be smoked. With a daytime temperature at a steady 72F and nighttime temperature of 65F it is much easier to control and destroy spider mite, thrip, and many other pest populations.
The same principal can be applied to the prevention and control of fungi, molds, mildews, and bacteria, which can spread more rapidly when temperatures in the grow room or reservoir exceed 90F. Also, the warmer the air, the more water it can retain which means humidity levels can easily go beyond the recommended 40-50% for Vegging. (you want high humidity for VEG, and low humidity for Flowering.) This high humidity coupled with lower nighttime temperatures can cause condensation to form on leaves. This will invite molds, mildews, fungi, and bacteria to take over you grow space. With high temperatures the likely-hood of losing control of the problem, such as powdery mildew, is very high. Once control is lost your plants may be the next to go.

Temperature is also very important when it comes to starting seeds and getting cuttings to root. Placing seedling trays on a heating mat will reduce germination time dramatically. Speeding up germination time usually leads to stronger and healthier plants. Also, less time spent between crop cycles makes a garden efficient. More harvests provided in less time can equal big bucks in the pockets of professional growers.
The ideal temperature for sprouting or cloning is 80F. Any higher and you risk burning the roots. Also, many seeds simply will not germinate at temperatures over 90F. The seeds will become dormant and never sprout.
The same principal used for seeds is used on cuttings to coax roots out quicker. The sooner cuttings can establish roots the better. If roots can be forced quickly they will grow strong and stay strong. A bottom temperature of 80F-85F, roughly 10F warmer than the air, will speed up rooting time and help to jump start those roots once they do begin. Let the temperature get too high or too low and roots growth will be hindered or they will never grow at all. Using the proper technique and the proper temperature for bottom heat not only can rooting time be speed up from 2 weeks to as little as 3 days, but the survival rate of your cuttings will drastically improve.

On the topic of roots, there is an ideal temperature for the root zone after the plants’ roots have been established. Roots are working 24 hours a day and constant attention is required concerning temperature in and around the root zone. The ideal temp for this root zone is generally 65 to 75 degrees F. At this temperature the ion exchange between the roots and the environment around them is at its absolute best. This means that the plant’s root system can take up more macro nutrients, more micro nutrients, and more oxygen at this temperature than at any other level. This makes a plant more efficient and a plant working efficiently will provide a superior yield.

Amazingly, some growers grow successfully with no themometer for the air or water. But for maximum efficiency, you got to take control of temps.

HUMIDITY? that is more simple to me. Get the Humidity VERY high for VEGGING, and very low for FLOWERING.

in Vegging, I mist them daily. I do raise the lights up, to be careful with my bulbs getting wet and breaking. And when it rains outside, it also gets cloudy and the sun's rays are blocked. Plants in outdoors, in nature do get an ocasional rain shower or thunderstorm. Do you let it rain on yours? I do, but artificially by MISTING.
AND, I bought a cheap humidifier.

Cheap Cool Mist Humidifiers from Walmart:

$26.00



Ultrasonic Humidifier With Light


$28.97



Graco, Cool Mist Humidifier, 1.5 Gallon $29.96




During Flowering, we need a low humidity, especially to avoid Bud mold and bud rot.

Cheap De-Humidifier for closets and tents
$40 at amazon.com
__________________

 

[Roseman]

My BubbleHead brother Dystopia posted:



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*.

4. Running a water pump continuously in the res will cause the temps to rise. I think I have a good idea how the stealth hydro system works, for instance, and I can certainly see the advantages of it during the early stages of growth. However, once the roots are in the water I'm not sure if running the pump continuously is necessary - maybe one of you users can help me out. If it was me, I would put the pump on a timer and run it kind of like an ebb and flow once the roots are in the water - like for 10 minutes 5 times a day - IDK.

Of course, like Roseman says, the best way is to keep your room temp down if you can. 75* is out of the question for me, it costs too much to keep my A/C running all day at 70*, especially since no one's home anyways. I keep my A/C at 80*, and my grow room at 85*.
Attached Thumbnails

 

[ROBINBANKS]

Nice read ROSEMAN. Rep to you on all good info.

 

[Roseman]

+ REP back at ya,

 

[Harlequin]

bis Growing Guide

Proper temperature is one highly variable factor. Most books state optimum grow temperature to be 70-80 degrees, but many list extenuating circumstances that allow temperatures to go higher. Assuming genetics is not a factor, plants seem to be able to absorb more light at higher temps, perhaps up to 90 degrees. High light and CO2 levels could make this go as high as 95 degrees for increased growth speed.* An optimum of 95 degrees is new data that assumes very-high light, CO2 enrichment of 1500 ppm and good regular venting to keep humidity down. It is not clear if these temperature will reduce potency in flowers. It may be a good idea to reduce temperatures once flowering has started, to preserve potency, even if it does reduce growth speed. But higher temperatures will make plants grow vegetatively much faster, by exciting the plants metabolism, assuming the required levels of CO2 and light are available, and humidity is not allowed to get too high.
With normal levels of CO2, in a well vented space, 90 degrees would seem to be the absolute max, while 85 may be closer to optimum, even with a great deal of light available. Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth.
Low temperatures at night are OK down to about 60 degrees outdoors, then start to effect the growth in a big way. Mid 50s will cause mild shock and 40s will kill your plants with repeated exposure. Keep your plants warm, especially the roots. Elevate pots if you think the ground is sucking the heat out of the roots. This is an issue if you have a slab or other type of cold floor.
As temperature goes up, so does the ability of the air to hold water, thus reducing humidity, so a higher average temperature should reduce risk of fungus.
Contrary to many reports, high humidity is not good for plants except during germination and rooting. Lower humidity levels help the plant transpire CO2 and reduce risk of molds during flowering.
Studies indicate the potency of buds goes down as the temperature goes up, so it is important to see that the plants do not get too hot during flowering cycles.
* D. Gold: CO2, Temperature and Hum
__________________

What about ideal temps during flowering with "normal" light (40 w/ sq foot) and CO2 enrichment (1500 ppm)? I've been aiming for 85 degrees and 50% humidity... does this sound reasonable? Oh, and this is at canopy level, not room temps, which few people seem to distinguish between and leads (me) to some confusion.

H.