Tomatoes are, for the most part, self-pollinating. The tomato bloom is self-fertile. Insects are not needed inside or outside. Air circulation in the form of a good breeze is needed and some by-hand assistance is common in the GH such as finger flicking the blooms, rattling the cages, a small fan, etc.

Dave

tomato plants will bear larger fruit if they are well pollenated. pollenation creates seeds, more seeds = bigger tomatoes. I use the electric toothbrush technique for pollenating my indoor and outdoor tomatoes. you can google the technique, but basically you take turn on an electric toothbrush with the bristles lightly touching the base of the flower. the vibrations shake loose the pollen and fertilize the tomato.

That's an interesting pollination methon EDJ. Thanks!