Winter is here and keeping the room a bit warm is necessary and i use my 500w oil radiator
https://www.ebay.com/itm/Netagon-Home-Work-White-5-Fin-Portable-Oil-Filled-Radiator-Heater-Thermostat/283273100392?hash=item41f4647c68:g:zc0AAOSwUalb~B0w:rk:11:pf:0
with timer and built-in thermostat to keep it between 15-18c at darkness.