Besides hot air blowers, what heating equipment do you suggest for small spaces?

hi dude ! can u tell me why u want to heat your space ? according to what u said in ur temps schedule 24°/day and 21°/night....wich are not bad (may be a bit hot at night) ha ok i understand now !! my bad 😁 you already use it...is it inside the tent ?? or linked by a sheath? as you said too much wind can already dry/burn leaves even in a good range of temps. a small place need a small ventilation in correlation.......so you must take precautions if u want to use it... and u absolutely right if u need heat.... an oil radiator is much better due to his soft heat...not agressive to your leaves i found some 500watt : 15 inch in height x 10 long and 5,3 width....is it good for your box ??....if yes it cost around 25/30 euros...for sure you can set the power another question wich kind of extraction do u have in you box??