I wasnt talking about outside, either.
In my room I got ~13°C in winter, If I am to lazy to fire the chimney (its an old farm house). Dont know what I would do without my PC here.
But a growing-lamp did not really raise the temperature. Didnt give much harvest. But what do I care, it was for myself. And I dont need much (and dont want to need much). I stopped the project, I need to get clear in my head. Find my goal in life. And while doing that I cant afford the money/time to care about some plants or smoke too much.
TL;DR: No heating in winter. only small plants.