Grow tent Temperature/ is it to low?

Hey now, 21C is very close to the premium range for growing cannabis. I would definitely prefer 23-24C as that is the ideal range for all stages of growth. There are enclosed 100 Watt panel heaters that would work well for you, as you only need a couple degrees. These heaters are also nice in humid environments as they have no fans or intakes etc. I also play around with my humidifier and opening and closing flaps on the tent. I mess around with my setup often and keep an eye on the weather so I know what to expect for the upcoming week. Hope that helped, good luck and blaze on!

Watch your vpd certain temp are recommended to have certain humidity your in a sweet spot if ya go up in temp u need more humdity like 24 degrees you want between 60 70% rmh

I agree with Hashy here.. you can adjust the humidity to the temps easier and cheaper than adjusting the temps to the humidity... you'll be amazed at how much following the VPD chart will help your grow!

It's good enough no need to worry. If I were to spend on an appliance I would invest in a dehumidifier for the flowering stage (to get it down to 40%) and indirectly your tent will be warmer. Buying nothing and leaving everything as is will still get you good results because your humidity and temperatures are both decent/good so enjoy your grow and good luck 😊

That's not hot enough especially for lights on it will stunt the growth of your plants yiu need 24 at all times happy growing