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Offlinedr pelican
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Cheap heater source for fruiting chamber
    #26786554 - 06/27/20 07:18 AM (3 years, 7 months ago)

I need to grow mushrooms in my basement and it is quite cold down there (1-2°C). I have a small plastic greenhouse fruiting chamber and was considering buying a humidifier. My question is, will the humidifier heat the surrounding air enough to to maintain a temperature at which mushrooms will grow? Or should I implement another temperature regulating device?


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OfflineEclipse3130
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Re: Cheap heater source for fruiting chamber [Re: dr pelican]
    #26786561 - 06/27/20 07:22 AM (3 years, 7 months ago)

Humidifier is not needed, a space heater will work will to get the temps up to 65-70


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Invisiblesandman420
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Re: Cheap heater source for fruiting chamber [Re: Eclipse3130]
    #26786623 - 06/27/20 08:00 AM (3 years, 7 months ago)

well a greenhouse obviously needs humidity so it either needs a humidifier of some type or stuffed to the gills with cased substrates that are misted fairly often.

but yea a space heater will be a good heat source thats what I use to heat my room. Not inside of a greenhouse now, just the general room. A humidifier doesn't make any significant heat.


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Invisiblesandman420
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Re: Cheap heater source for fruiting chamber [Re: sandman420]
    #26786627 - 06/27/20 08:03 AM (3 years, 7 months ago)

After reereading that it says 1-2c in the basement i didnt notice that. You need to frame a small insulated room in the basement to put this greenhouse in, and in that room use a space heater to heat the room up to 21c with a temp controller. You might find it more convenient and easier to use monotubs or some such instead of a greenhouse in this little room.


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- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Edited by sandman420 (06/27/20 08:04 AM)


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InvisiblecoAsTal
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Re: Cheap heater source for fruiting chamber [Re: sandman420]
    #26786750 - 06/27/20 08:57 AM (3 years, 7 months ago)

A possible better option than a space heater for the whole area, (which will also dry out the air,) could be a seedling heat mat.
Vivosun makes very cheap kit with a temp regulator (~$28). I use these for seedlings, but they are very gentle, and can be used to keep a sealed space warm without too much heat buildup at all if used correctly.
People that worry about them overheating/hot-spotting the sub are not using them correctly-- they should not be put in contact with the container being heated unless the set temp is very low, but instead used as a passive radiator in the space to modestly warm the air in that contained space.
The pad can be placed below (or near-- doesn't much matter) a container that is itself within a contained area) and the low heat will radiate through the enclosure via convection.
The temp sensor should be placed on the heat mat itself, so that it doesn't ramp up too high trying to heat a different location. It's like when you put a temp sensor in a turkey in the oven, the heating element goes way higher than the thermometer shows in order to raise the turkey temp. You want the temp of the heater to stay low, so put the sensor ON the heater, and it will remain warm but never hot.

If you were to set it at 15 or 20C for example, it would not go higher than that, but the air gap above the pad wouldn't get that high. The box interior might not get above 10 or 15 (using that example) but it'll stay where you want it by adjusting the temp.
I have tested this and found that you can keep ambient air in a closed box around where you want it without heat spots affecting too much area because the mat doesn't stay on long tokeep itlelf at the desired temp.

The key is making sure you put the temp sensor on the mat so that it only heats to the set temp and not higher, which it would do if you set it a distance from the heat mat.


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OfflineWhoKnowsAnymore
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Registered: 01/18/23
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Re: Cheap heater source for fruiting chamber [Re: coAsTal]
    #28152526 - 01/22/23 05:11 PM (1 year, 24 days ago)

I have a question about your experience with this. I'm new, but I have one of those seedling mats and wanted to duplicate this approach many times, for less money. I have a unique situation I'm trying to resolve, and a limited budget.

I got a six foot tall tent, with a six shelf rack system inside. I've found it near impossible to control temp throughout the tent and not have wild variations. This is compounded by having to aim a space heater in such a way that it's not aimed at my humidifier, or any substrate, and provides nice circulation. Not easy.

My solution is to temp control each and every tub/pan. I'm using one inch tall 12" x 12" pans. Trying to get seedling mats for each pan would cost a ton. I've just ordered a bunch of 4" x 5" mats that are 12 watts (and 12v) from China, as well as a bunch of digital temp controllers. I figure it's way more complex and expensive, however, I can perfectly control every tray, and it allows me to support strains that may have differing temp needs (like shiitake, which fruits at about 55 degrees).

With your experience with these mats, do you think I could provide uniform and safe heat if I secured the thin mat to the inside of a pan, tape the sensor about a half inch away, and then put a couple chop sticks in the pan to space it vertically from the one that will hold the colonized cake? Note, the substrate will be 4 inches tall, but the pan only one inch tall, so it's possible that the top of the substrate needs better heating than having the sensor in direct contact with the heater. I could run the space heater as well, to a lower temp, but again that's not consistent. Maybe burying the heater and the sensor in a half inch of grains could give a nice, even heat? Thoughts?

Note, the pricing worked out such that with shipping, per pan, it will be $6.90 to temp control.  That does include inline fusing, but does not include the cost of wire, battery or battery charger to run the system. I have that stuff sitting around. If I need to sacrifice a pan for each application to even out the heat, that's only another $0.50 in a bulk purchase. So, $7.40 per cake location to control temp.


Edited by WhoKnowsAnymore (01/22/23 05:19 PM)


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