heating systems for shop floor

[i=p/u]

anyone know of quality efficent heating systems for a shop floor with automatic door. as old ones dont work when minus temperatures and blows from back towards doors... any advice and knowledge would help. shop size is 25m L x 15m W

 

[jayglynn]

Put a good Air Curtain up at the door, you would'nt believe the difference they make.

 

[Marvo]

Try medium wave infra red heaters, they heat people rather than trying to heat the air. Reducing the draughts will certainly help as well