I have an opportunity to get a gas heater for my shop at a great price and am trying to figure out if it will work for me. The problem is that the heater is a 125K btu unit and my garage is a 2 car garage. All of the literature that I have read on the heaters like the Hot Dawg is that 45K btu is sufficient for my size shop. So my question is whether the larger unit will make the shop too warm or be inefficient (i.e. burn too much fuel) in a shop my size. Any thoughts? Thanks