Basements stay cool all year, which helps in summer but can slow plants down badly in winter. Night temperatures below eighteen degrees stunt many tropical leaning strains and stretch flowering time noticeably. For my own basement setup, I searched https://budweedseeds.com (https://budweedseeds.com) for sturdy indica dominant genetics described as tolerant of cooler conditions. A small heater and insulation under the pots still matter, since cold roots cause more trouble than cold air.