when the heater or cooling system unexpectedly fails in the middle of the night, you may be a little apprehensive about calling an emergency rebuild service. on one hand you want your unit back up and running as soon as possible, but on the other hand, you don’t want to be taken advantage of just because you are desperate for functional heating or cooling. when deciding whether or not to hire an emergency rebuild craftsperson, you need to look at both the preferred and the bad in order to choose your repairman wisely.