Dehumidifier questions

Just wondering how much extra heat a mid range $200 dehu creates?.

High heat>humidity>co2 in a closed room is desired. How ever, in a none sealed room with temp of around 80/85 peaks, humidity of around 65/70 would it ultimately allow more co2 uptake during lights on (dehumidifying during off+airflow). In essence trying to use the less than ideal conditions to an advantage. I've read that some 600ppm co2 is common in a residential setting, would the increase in heat/humidity allow more utilization of that or is it more than used up if the temps are in line at low 70/30%rh?. Maybe adding a diy co2 generator to bring the ppm into a better range during the heat waves/hot spells may be of aid?.

If this is not plausible and the air transfer is at max with a unavoidable bottle neck, what would ones options be to lower heat/humidity without sacrificing light?.

bump

If you don't get an answer I'll provide one tidbit that'll help. I was just listening to the Dude Grows Show episode #33/34 where they had Todd from Temperature Needs on the show. He's an HVAC tech in Colorado that many cannabis growers use to help with their growrooms. He discusses how the output of heat from AC and Dehumidifer units in growrooms change variables like RH, Co2, and Temp.

The link below will start right on his interview:

https://www.dudegrows.com/ac-talk-with-temperature-needs-todd-ep-33-segment-producer-rip-vanwinkle/

The use of higher heats and RH's are needed to effectively utilize elevated Co2 levels. They rise as the PPM of the gas used is raised....

1300 ppm (the upper limit of indoor effectiveness, as going over that is difficult to deliver the needed increase in light intensity required) and a temp of 89 - 91 and an RH of around 80 is the zone for that gas ppm to be the most effectively utilized.

You use an environmental controller and set the temps and Rh limit. It fires and exhausts the room and restarts the bass and the whole thing starts over. At night when the gas does not run. You need to exhaust the room and lower the RH/Temps for the lights out period.

Never did understand folks saying they gas in a totally closed room! You gotta change that air out periodically.

smokebros said:

If you don't get an answer I'll provide one tidbit that'll help. I was just listening to the Dude Grows Show episode #33/34 where they had Todd from Temperature Needs on the show. He's an HVAC tech in Colorado that many cannabis growers use to help with their growrooms. He discusses how the output of heat from AC and Dehumidifer units in growrooms change variables like RH, Co2, and Temp.

The link below will start right on his interview:

https://www.dudegrows.com/ac-talk-with-temperature-needs-todd-ep-33-segment-producer-rip-vanwinkle/

Click to expand...

Listening now cheers

Dr. Who said:

The use of higher heats and RH's are needed to effectively utilize elevated Co2 levels. They rise as the PPM of the gas used is raised....

1300 ppm (the upper limit of indoor effectiveness, as going over that is difficult to deliver the needed increase in light intensity required) and a temp of 89 - 91 and an RH of around 80 is the zone for that gas ppm to be the most effectively utilized.

You use an environmental controller and set the temps and Rh limit. It fires and exhausts the room and restarts the bass and the whole thing starts over. At night when the gas does not run. You need to exhaust the room and lower the RH/Temps for the lights out period.

Never did understand folks saying they gas in a totally closed room! You gotta change that air out periodically.

Click to expand...

I understand the general setup for sealed room but what I'm asking is if you can utilize a lower than sealed optimal heat/rh level to take more advantage of what ever co2 level is available (up to 600 by another growers accounts). Basically, instead of trying to vent out the heat and reduce rh to 30%, can one use it to advantage, say reducing rh to 60% or w/e the applicable % is to current heat. Even though it is not to the extreme benefit of max usable co2/sealed room as you describe, perhaps its possible to work with the heat rather than against it?.

Sure!

Your quoted temps and RH are plenty enough for 600 - 800 ppm.

I never get my RH below 40. Don't need to......40-45 is the running RH. Some like it lower for more up-take....I have my balance to feeding set for that 40/45.....

Temps of 80, if your growing successfully at that (No burning or signs of over feeding), your good.

Black&Decker 45pint. Output air temperature is 92.6°f

Flowki said:

I understand the general setup for sealed room but what I'm asking is if you can utilize a lower than sealed optimal heat/rh level to take more advantage of what ever co2 level is available (up to 600 by another growers accounts). Basically, instead of trying to vent out the heat and reduce rh to 30%, can one use it to advantage, say reducing rh to 60% or w/e the applicable % is to current heat. Even though it is not to the extreme benefit of max usable co2/sealed room as you describe, perhaps its possible to work with the heat rather than against it?.

Click to expand...

600 ppm for CO2 seems a little high, normal is about 400ppm without supplementing and in a sealed or semi sealed room that will come down very quickly. As for the heat you can easily use it to your advantage. Using the VPD chart the higher the temps you have the higher the humidity. You will have to be careful of PM so you will want plenty of air movement to help fight it

SouthCross said:

Black&Decker 45pint. Output air temperature is 92.6°f

Click to expand...

ok thnx for a bench mark

mjinc said:

600 ppm for CO2 seems a little high, normal is about 400ppm without supplementing and in a sealed or semi sealed room that will come down very quickly. As for the heat you can easily use it to your advantage. Using the VPD chart the higher the temps you have the higher the humidity. You will have to be careful of PM so you will want plenty of air movement to help fight it

Click to expand...

I thought that too but he had a co2 tester and that's what he found. Ofc it's likely very different depending on setup/location and most of us don't have a meter so can only depend on the deemed avg.