Heaters for small grow tents??

T_Dub

Well-Known Member
Joined
Sep 26, 2022
Messages
239
Reaction score
723
Location
USA
That split system AC sounds cool, but it’s more than I can spend on growing. Great solution though.
While we’re not in the true coldest temps yet, I tested OldFogey’s idea last night when temps dropped to 68. I set the oil-filled radiant heater to turn on when temperatures fell below 72. I placed the heater in front of the intake port, and I run my fan at a speed of 1-2 at night so it’s always drawing in fresh air. It works…..but it’s probably inefficient kicking that space heater on and off. I didn’t test it for long, and I just didn’t feel safe leaving the space heater unattended.

A017C07C-F7B7-4AFC-BC2E-D234635964B9.jpeg

After more research though I’ve decided to experiment with using a large heat mat as my heat source. It’s a constant 80-87 degree temperature, so nothing too hot. It will turn on if temperatures drop below 72 degrees. I am in a 2x4 tent and I found a mat that is 20”x 48”. My plants sit in saucers and I use plant elevators that raise them about 2 inches, so I don’t expect to cook the roots with the heat mat since there is airflow under the rootball. I also have a small fan on the floor moving air around 24/7, so the heat should be dispersed quickly. If this works, I’ll update for anyone else looking for safe heating solutions.

I could also lift the saucers off the ground with lifts if there’s concern about the roots becoming too hot.
2554A605-1924-43D4-A1A6-FB2169BBEEF6.jpeg

Thanks again for the great ideas….
 

Attachments

  • 9271B527-9B9E-41DF-B117-1F604D4DF87A.jpeg
    9271B527-9B9E-41DF-B117-1F604D4DF87A.jpeg
    45.4 KB · Views: 0

KGBSkunky

Well-Known Member
Joined
Nov 17, 2022
Messages
50
Reaction score
80
Location
Maryland
Being someone who has not done this but has been researching I find this interesting since I will definitely be using a grow tent in my basement. The way I see it, based on what you are saying, I should grow autos when it’s cold so I can put some kind of heating lamp in the tent. The heating arrangement wouldn’t bother an auto from what I can tell. Just a thought

Or

You could buy an inexpensive 4 inch duct heater and feed it through the bottom of your tent. I find this interesting and think I will build a 4 inch duct heater into my tent layout controlled by a thermostat in the tent. I believe they are like $30-$40
 

T_Dub

Well-Known Member
Joined
Sep 26, 2022
Messages
239
Reaction score
723
Location
USA
Being someone who has not done this but has been researching I find this interesting since I will definitely be using a grow tent in my basement. The way I see it, based on what you are saying, I should grow autos when it’s cold so I can put some kind of heating lamp in the tent. The heating arrangement wouldn’t bother an auto from what I can tell. Just a thought

Or

You could buy an inexpensive 4 inch duct heater and feed it through the bottom of your tent. I find this interesting and think I will build a 4 inch duct heater into my tent layout controlled by a thermostat in the tent. I believe they are like $30-$40

I tried a 2x4 heat mat in the bottom of my 2x4 tent and it didn’t make a dent in the temperature. I have a small ceramic heater on order for the 2x2 tent…..might try it in the 2x4 tent too. It’s 250 watts (very low wattage for a heater) and doesn’t get too hot to the touch. I’ll let you know if it’s enough to raise the tent temperature.

D9916ABA-B3CD-405F-8A3B-5494A26990B0.jpeg
 

Dan789

Well-Known Member
Joined
Jan 8, 2017
Messages
291
Reaction score
217
Location
Northern California
It's been a minute, sorry for the long lapse, but hey I'm jumping in on this: I use thermo controlled matts under neath the plants, and outside of the tent use a timer and thermo controlled oil filled radiant heater for when the lights are out. Granted I'm not in a very cold area but that's my $02.
 

ActivatedAlmonds52

Active Member
Joined
Jun 5, 2021
Messages
31
Reaction score
40
Location
Spain
I was just about to post a VERY similar thread, but noticed this one. So I'm just going to paste what I wrote below:


Am I right to be concerned by temperatures fluctuating between ~54 and 77°F?

I have no growing experience. I'm almost done building my first growbox, which is a 21 x 34 x 77" wardrobe I meticulously converted (99% lightproof!). Big carbon filter, ventilated hood reflector etc.

The problem is that it's in a BIG room which I don't want to heat (don't want to bore you with the details). During winter the tempeature in that room is about 54-60°F (12-15°C).

My lamps and ballast are 250W and while I'm aware that they will generate some heat, I will probably need something extra for however many hours the plants will be in the dark (still need to read a bit about light schedules).

I think I'm going to do a "dry" run anyway: turn everything on and record temparature changes.
 

SubmarineGirl

Well-Known Member
Joined
Nov 4, 2021
Messages
7,088
Reaction score
25,959
Location
Virginia Beach
I think your plants will adapt well with temps fluctuating between 54 and 77F. You may even see some nice colors that you wouldn’t in a room like mine (my utility room which stays very warm especially in the winter when the gas furnace is running more).
you can control some heat in your tent by adjusting the vent fan up and down but need to watch the humidity levels when you do this.
good luck with your dry run. Please post your outcome and what you plan to grow in your new grow space
 

ActivatedAlmonds52

Active Member
Joined
Jun 5, 2021
Messages
31
Reaction score
40
Location
Spain
I think your plants will adapt well with temps fluctuating between 54 and 77F. You may even see some nice colors that you wouldn’t in a room like mine (my utility room which stays very warm especially in the winter when the gas furnace is running more).

That's good to hear. I was afraid I'd have to bother with yet another aspect of the whole process.

As for the dry runs, I'll do two: one with MH and one with HPS. I'll put a spare phone in front of the thermometer to record it for 24h (12 light/12 dark). I'll share the results here.
 

oldfogey8

Very grouchy and ornery today…
Joined
May 12, 2014
Messages
8,186
Reaction score
20,317
That's good to hear. I was afraid I'd have to bother with yet another aspect of the whole process.

As for the dry runs, I'll do two: one with MH and one with HPS. I'll put a spare phone in front of the thermometer to record it for 24h (12 light/12 dark). I'll share the results here.
They sell relatively cheap thermometer/barometer units(under $10) that have a max/min button on them that will display the maximum and minimum temps they experience. That should give you a better idea of the range over time since ambient temperature outside the tent will affect temperature inside the tent.
 

joeb631a

Well-Known Member
Joined
Mar 12, 2022
Messages
7,714
Reaction score
29,849
Location
L.I N.Y.
They sell relatively cheap thermometer/barometer units(under $10) that have a max/min button on them that will display the maximum and minimum temps they experience. That should give you a better idea of the range over time since ambient temperature outside the tent will affect temperature inside the tent.
I love my sensor push they are $50 and connects to your phone and gives ht ,rh and averages.
If you buy a hub you can get that info any where .
new ones have VPD too i believe
 

oldfogey8

Very grouchy and ornery today…
Joined
May 12, 2014
Messages
8,186
Reaction score
20,317
I love my sensor push they are $50 and connects to your phone and gives ht ,rh and averages.
If you buy a hub you can get that info any where .
new ones have VPD too i believe
@T_Dub has something like that I think. Pretty cool tech(pun intended)…
 

T_Dub

Well-Known Member
Joined
Sep 26, 2022
Messages
239
Reaction score
723
Location
USA
@T_Dub has something like that I think. Pretty cool tech(pun intended)…

That SensorPush looks like cool technology. It’s “read only”, so you can see tent conditions from anywhere but you can’t make adjustments on the fly.

I use the AC Infinity Controller 69 on three tents. They have a “Pro” model, which is both wifi and Bluetooth. It provides you with a summary of your current environment. It also allows you to make adjustments to four components from anywhere. I have my veg tent set up where I can control the LED, the inline fan, the humidifier and the oscillating fan from my phone via wifi. It is a smart controller that is very useful for maintaining an environment, as long as you use compatible equipment. It also allows you to set VPD targets too.

Here is the main screen
0AEEB6EF-9FF6-4BF0-B3F1-7566246787D4.png


Here are the individual screen where you manage each component.
8107CF7E-B2CC-47E3-9478-3CBCAEEB8C2C.png D6BBAD81-4C58-4157-87D4-086E06A79C1C.png 7A1AFD53-A8D8-45CE-9ECD-0DA5EC4BE431.png 1914E0B8-F220-49D0-B2FB-79B307546C9D.png
 

KGBSkunky

Well-Known Member
Joined
Nov 17, 2022
Messages
50
Reaction score
80
Location
Maryland
Plan on doing some experiments with this today just without plants. I want to see if I can maintain a constant temp using the AC Infinity controller and a small ceramic heater with tip over protection. The heater will go up to 1500 but it’s low setting is only 500 watts. I calibrated the temp and humidity sensor on the controller yesterday. Working on my grow design and fully automatic watering system now so I am ready to roll on July 1st.

Also note that I figured out a way to put the 6 inch fan and carbon filter inside the 3x3 tent but still use the light to the top of the tent…without making a single 90 degree turn so I get maximum airflow. I love this stuff!
 

oldfogey8

Very grouchy and ornery today…
Joined
May 12, 2014
Messages
8,186
Reaction score
20,317
Also note that I figured out a way to put the 6 inch fan and carbon filter inside the 3x3 tent but still use the light to the top of the tent…
I have my fan outside the tent. Only the filter needs to be inside the tent. I try to minimize the heat sources inside the tent. I would be more concerned with having a heater inside the tent as the output will be very hot and dry which could burn plants too close to the heater. I am not trying to discourage innovation. I am just giving input.
 

KGBSkunky

Well-Known Member
Joined
Nov 17, 2022
Messages
50
Reaction score
80
Location
Maryland
I have my fan outside the tent. Only the filter needs to be inside the tent. I try to minimize the heat sources inside the tent. I would be more concerned with having a heater inside the tent as the output will be very hot and dry which could burn plants too close to the heater. I am not trying to discourage innovation. I am just giving input.
I tried putting the exhaust fan outside the tent and it makes too much noise for me. Since it’s out of my way now it doesn’t matter that much for my purposes.

And I can clearly see your point about burning the plants if you had a heater blowing on them but in my design the small ceramic heater will be below my plants and will put out small amounts of heat. As for the humidity I also see your point. I will add water in a pan directly in front of my 500 watt heater and monitor both.
 

WeedHopper

Well-Known Member
Staff member
Moderator
Joined
Nov 7, 2008
Messages
26,824
Reaction score
53,444
Location
Dallas
That SensorPush looks like cool technology. It’s “read only”, so you can see tent conditions from anywhere but you can’t make adjustments on the fly.

I use the AC Infinity Controller 69 on three tents. They have a “Pro” model, which is both wifi and Bluetooth. It provides you with a summary of your current environment. It also allows you to make adjustments to four components from anywhere. I have my veg tent set up where I can control the LED, the inline fan, the humidifier and the oscillating fan from my phone via wifi. It is a smart controller that is very useful for maintaining an environment, as long as you use compatible equipment. It also allows you to set VPD targets too.

Here is the main screen
View attachment 317173

Here are the individual screen where you manage each component.
View attachment 317176 View attachment 317177 View attachment 317178 View attachment 317179
Thats pretty cool bro.
 

KGBSkunky

Well-Known Member
Joined
Nov 17, 2022
Messages
50
Reaction score
80
Location
Maryland
As soon as the heater turned on humidity dropped drastically. Putting a bowl of water in front of the heater did almost nothing. I am realizing that at the start of growing if you use a heater a humidifier will be necessary if you want total control of the tent climate. It also shows that I will also need a dehumidifier later on



22012F94-73C7-479A-AEE9-5EC2EDF1C35F.jpeg
 
Top