I have been through a bunch of these screw guns, and have tried out other tech options. I like the smaller drill shaped screw guns with:
- A light on the tip (DeWalt has one with three lights. . . no shadows)
- A clutch (so I don't strip holes)
- low rpm (<500) and high rpm (>1000) settings
- lithium ion battery, that keeps it's charge in 0 degree weather
- has 1/4" quick release bit holder (can buy drill adapter, and get drill bits, wire brushes, etc with this shaft.)
- small enough to fit in my toolbox
Right now I run a little Makita 10.8V.Here is a link to it
, but it looks like now it is a 12V screw gun! I saw a DeWalt at Lowes/Home Depot that was shorter, had three lights, had higher rpm (1400), and also ran on 12V, which means it probably has more torque for compressor bolts. The down side of the DeWalt screwgun I saw was it didn't have a low torque setting.
I use this Makita to do everything from panel screws to cleaning out ducts with the rotary brush. I normally get 3 to 4 days out of a battery. If I clean a duct, it takes at least one battery. I always have a battery charged and ready to go in the service truck.
Here is a link to the 1/4" shaft drill adapter
that I put on the screw gun for when I need to use things designed for a traditional drill.
For those hard to reach areas, I use this flex extender: