I have bought a hobbyist kit which involves growing E. coli. The steps said to grow the E. coli on an LB agar Petri dish overnight. No incubation devices were included in the kit.
I let the E. coli grow overnight at room temperature (65-75°F), but there's pretty minimal growth, if any. I found this question which seems to imply that it's hard to grow E. coli without having temperatures near 37°C, which is much warmer than I can reasonably make my house.
Is it possible for me to do this experiment without purchasing an incubator of some sort? If so, does the lack of growth indicate that I've made a mistake somewhere?