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tips   , 31

from Kelly Usa

How To Cool A Grow Room?

If you have ever kept chicken, you understand how they respond according to the set environment. Plants behave in the same manner. The best grow room is constituted by the best environment.  Even though this may vary from plant to plant varieties, they all conform to temperature from 70 to 80F. This is the optimum temperature for aerial growth and 66F for the roots.

Too much heat stress out the plants. The results will be spindly your plants or mature plants that don’t flower. Apart from that, the plants become more susceptible to diseases.

If you want a higher yield, you need to keep things cool in the grow room. We are going to share 10 strategies to handle the heat problems. Continue reading...


Use an AC

An air conditioner is the best option you have to take care of too much heat. When you think about achieving efficient temperatures in your grow room, the first thing on your mind should be an AC.

A portable AC grow room with a thermostat should be top on the list of items you need in your grow room. The will ensure that you can easily monitor the changes in the temperature and control them as appropriate.

Do your homework before buying any such units though. There are so many products on the market, some which may not serve you are you would expect. The aim of having an automated system is so that you can sleep at night and let the environment stay controlled.

Buy a swamp cooler

Among the many methods you can use to keep a grow room cool, this is the simplest. It employs the basic principles of air conditioning to reduce the ambient temperature.  The principle state that, substances like refrigerant absorb heat when they convert from heat to gas.

For the swamp cooler a fan is used to blow air over through water moistened media. The process evaporates the water, causing a drop in the temperature.  In some cases, the temperature can drop with up to 10 decrees.

Other people use misters which perform almost the same function. They produce minute water droplets that evaporate with immediate effect.

But be warned, swamp cooler and misters produce humidity. This can be dangerous for you plants if you don’t handle it as soon as possible.


Sometimes heat builds up in a grow room because of poor insulation. Lighting is the main cause of heat spikes in a grow room. It becomes worse when the temperature outside is hot as well, especially during summer.

if you have poor insulation on the south facing wall, heat will built up. In addition, a room locate directly to a hot roof is an oven.

Add insulation to help alleviate the issues. And if possible, move the room to the basement. You won’t have to worry about too much heat anymore. Underground insulation is probably the best because there is soil all around that keep heat out. It is natural insulation.

Control humidity

Humidity is directly affected by temperature and vice versa. If the humidity is low, then the plants will face more heat. This is because transpiration and exhaling is taking place during hot weather to keep things cool.

These are the mechanism used by the plants which may not be enough sometimes. In such cases, the plant will become stressed.

You help the plants by increasing the relative humidity which creates and environment with less heat on the plants. You can for instance mist the grow room a few time a day. And if you are too lazy for manual methods, consider using a humidifier.

Remember the rule of thumb which to keep humidity between 40 and 50%.

Set proper lighting

The lights, as seen above are the number one cause of heat in the grow room. There are lights that emit less heat. Consider using such. They are expensive options but worth your investment. You can also:

  • Raise the lights. If you cannot afford more expensive low heat lights, then you can still raise the ones you have. This might have a slight effect on direct heat hitting the plants. But it may not solve the problem in the whole room. And you can also dim the lights or use them only during the night.
  • Add a fan. A fan can be a better option when you are looking to redistribute the heat evenly.  Position the fan just above the canopy for better results.
  • Install a light mover. A light mover is a motorized system that mover the grow lights back and forth on a straight line or a curve. This distributes the illumination across a border area. There will be no hot spots, hence no canopy overgrowth. You might not need additional lights when using such an approach.
  • Use the light at night. If you feel there is no need for the lights during the day, why not just switch them off. Temperatures are cooler during the evening and night. Besides, you get to save on power consumption as some electrical utilities charge lower during the off-peak hours.

Improve the venting system and promote good air circulation

Consider proper input and exhaust fans. This will vent the hot air, getting it out and bringing in fresh air from outside. This process is called air exchange which helps control humidity as well.

Ensure the air inside the grow room is moving. This will keep the room off hot spots while assisting in photosynthesis. Use a multiple fan system to give your plants a stronger stem and leave while ensuring proper air flow.

Get the right nutrients concentration

Plants transpire to achieve internal air conditioning. They increase water uptake which can affect nutrients intake as well. To avoid the problem of toxicity, adjust the nutrient-to-water ratio.

You can also use micronutrients by increasing some elements. This will improve the natural deficiency of the plants. For instance, silica can help build stronger cell walls.

Final thought The methods mentioned above are sure to get you regulated temperatures in the grow room. In addition, consider boosting CO2 levels and proper reservoir placement. We hope this helps you get better yields.