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Message: <blockquote data-quote="Deadeye" data-source="post: 1786929" data-attributes="member: 27202">Crikey.  There's something seriously wrong with either your heater, your insulation or your thermometer!6m x 6m x 2m garage = 72m3 airAir weighs 1.22Kg/m3 so 88KgHeat capacity of air is 1005 J/Kg/oCSo a one degree rise would require 88 x 1005 = 88,440 JYour heater is putting out 3000 J/s so should take just under half a minute to go up 1oC.If the front grille isn't warm, the heating element is broken and it's just a fan.To the original point about how to make the garage warmer - Insulate ceiling, walls and (if you can, floor); and stop drafts.  And if your dust extraction goes outside you'll never win!</blockquote>