Heat is transferred 3 ways convection, conduction and radiation. Convection is hot air, also known in the industry as scorched air. You heat the air and the warm air warms you and the stuff in the building. Conduction- you touch something warm and it makes you warm, not practical for building heating. The last is radiant, with the tubes in the ceiling actually throw off infra red waves and what ever is in the way of the waves gets warmed except for the air, you heat objects not air. In floor radiant again you warm the floor and everything else follows. My shop has in floor radiant I love it. It's 24x30 in Northern Wisconsin and a 60,000 btu water heater keeps it warm, as others have said the shop set at 50 is more comfortable than a forced air unit set at 65. Advantage of in floor radiant- you can run at a lower temperature and still be comfortable, equipment gets warmed fairly quick, the Wheel Horse & blower get thawed out and dried off quick, fairly efficient and if you're so inclined it's easy to multi-fuel with a solar system, a waste oil boiler or biomass boiler (wood or fat) or store/bank heat in something like a big water tank. IR tubes in the ceiling are also efficient, act on the equipment (will thaw and dry your trucks quickly after a bad winter night response) but don't do well on different fuels except maybe natural/lp gas. Downside on radiant is if you want Air Conditioning you have to have a convection system for cooling. Although if you're in Nebraska you might be able to use evaporative cooling, not something we can do in Wisconsin. As for the comment on the radiant tubes in the ceiling, yes hot air will rise, but the tubes aren't heating air, they produce infra red waves that travel through the air until they hit something and the heat goes into what they hit, not the air, as the floor or truck gets warm it will reflect some heat back into the air but most of you heat energy is going into "things" like trucks, tractors, floors, walls and people.