I do it in my laundry room, on the floor, sitting on a rug with trays around me (not even using a table). As a light source, I have a 15W bulb I picked up at the hardware store; trays are cat litter boxes ("almost" new). The bulb hangs from the ceiling, I use the kitchen timer, never check the temperature (my basement is always more or less at the same temperature). I have some cardboard on the windows which I duct taped a long time ago.
I lay the paper and negative (in printfile sheets) on the floor, put a piece of glass on top, turn the light on for 3 seconds, and that's about it, develop for 1 minute, stop for 10 sec, fix for 30 sec, then wash under the running water for not so long.
Works great, no enlarger, good results, very quick setup, cheap and great.
I don't use formalux or stuff like that, just ilford multigrade RC, much easier to find and cheap. Eco-pro as a developer (1+9) and prepare 500ml of soup or so.