help needed for tomato plant
-I wouldn't worry about temperature if the tomato is indoors - mine are quite happy right now out in an unheated greenhouse.
Don't put it in the boiler cupboard - you'll never get as much light from a little lamp as you will from the sun, even in winter
-Be careful not to overwater
-pinch out the top if it's getting too big to manage
-Lots of light would be good, so I'd keep it in the southwest window