I started my grow in the bathroom, it has heat controlled floors and very good ventilation. Has worked fine with 200 W LED light. Along with humidifier, pH pen and EC pen. Still I purchased a grow tent to give plants best possible grow conditions.
I think a tent will greatly improve the end result. You don't have to break the bank when buying one. Start small and find out if this is what you want to spend time and money on. Happy growing,, 😁