Cold weather fermentation heater

[ddibbern5]

I’m getting ready to put my fermentation chamber together.
I have a small chest freezer, however cooling isn’t my concern now...
Temps are in single digits where my ferm chamber is located. I purchased a heat mat that I have attached to my carboy now with inkbird controller. Where the carboy is located ambient temp is ~68 and the heat mat is on constantly and never gets above 70.
Is that right shouldn’t it heat it to temp (+2 degrees)
This is the heat mat-
https://www.amazon.com/dp/B01LZXOP1C/ref=cm_sw_r_em_tai_VZTtAb3A8GJVJ

My temp probe is attached with masking tape on the outside of the carboy. Could it be reading ambient temps and the carboy is actually warmer? Or is the mat defective?

I was thinking this type of heat mat would work to heat the fermenter but no way with these temps.
Now I’m looking at a small ceramic heater but have concerns about safety.?

Is a ceramic heater safe in a chamber? Any recommendations?


Thanks all in advance for your help!

 

[Transamguy77]

I have been using this for the last couple of years, I like that it's only 200 watts and has a fan to circulate the air.

https://www.amazon.com/dp/B005Q1APZS/?tag=skimlinks_replacement-20


Sent from my SM-G550T using Home Brew mobile app

 

[ddibbern5]

Thanks @Transamguy77