Tom, last week I also noticed that many of the citrus trees (both in ground trees and container trees)in my greenhouse have started their "spring" flush and bloom. To move the air inside my greenhouse I use six 2-ft. square box fans. Three fans blowing the air down from the ceiling to the plants below, and 3 fans moving the air horizontally around my 32'W, 72'L, 11' H greenhouse. Citrus trees appreciate air movement. As for pollination, many citrus trees are self pollinating and do not need any help from man nor insect. A few citrus varieties require cross pollination with another variety. You can also spray your trees at full bloom with Gibberelic acid (GA3). GA3 will "pollinate" the flowers, and in your setup should also produce mostly seedless fruit. Lastly you could either hand pollinate with a brush, or use a hair drier, or any other air blower, **however most likely nothing will be needed by you to obtain fruit**. Not knowing what cultivars you grow the sentence just above **might not be true. Below is a list of Citrus that I am aware that require bees or mankind to cross pollinate in order to bear a crop of fruit.
Dancy- Don't need bees but parthenocarpy very weak.
Temple - Don't need bees but parthenocarpy very weak.
Orlando
Minneola
Robinson
Osceola
Nova
Lee.
These varieties, as all citrus, can also be "pollinated with GA3.
Millet (368-ABO-)