My basement setup seems to work fine. I don't have a tent, but framed rooms (one with panda film the other with white wallboard). I use air cooled lighting, but I'm sure considerable heat rises through the floor. I also have lots of ventilation, well over 500 cfm in each 10x8x6 room, coming through carbon and the lights. During winter, this is vented back into the house into a back room and helps with heat also. In the spring it's a five min job to switch to vent pipe that goes outside. I have box fans hanging in the basement blowing into the rooms to ensure good CO2 flow (it's typically normal at around 350, checked with a good monitor). My temps and humidity are damn near perfect most of the time. If it does get humid in summer I have dehumidifiers ready to kick on in each room.
This setup has helped a lot with the heating bill. I've used maybe 200 gal of oil in the past 12 mo.