David and Donovan got to climb up on the roof to help me get the swamp cooler running. They could hardly contain their excitement and had to be reminded repeatedly that they had to wait for me to be on the roof before they scrambled up there (we didn't want them having too much fun on their own).
The boys were big helper doing just about everything that needed to be done with a little coaching from dad. 
Before long we'll have these boys trained and then watch out world!
We now have a functioning swamp cooler! Thanks for your help boys.