Quote Originally Posted by Sjapp
Also, would using a carbon filter for the exhaust take away the smell. It would be best if my parents didn't find out
Carbon filters aren't foolproof, they can lose their effectiveness after prolonged use, if they're in dusty conditions, and so on. If cultivating cannabis is illegal in the state/country you live in, it would be wise not to hide it from your parents. If, for some reason, the authorities were to find out about your grow, your parents could get in a lot of trouble.

If you really do live in the Netherlands, then just get a space heater and keep it close to your grow area. Distinguish how hot you'll need to keep it by adjusting it during the coldest time of the night. Also calculate how much heat is already being produced by the lights.