I recently made a 2 changes in my a keezer and have seen a huge jump in the electric bill ($80) without any other major changes in electricity uses in the house.
First, I revamped my keezer collar to connect it to the lid and stain the new wood a different color. I haven't yet attached foam to inside collar however. I know I need to do that. Checked it with a flashlight and can't detect any noticeable leaks.
Next, I have a 5 gallon plastic canister (like one for dog food) on the hump filled with water that pumps through my wort chiller placed in my water bath. Maybe my chest freezer is running all the time (for an hour sometimes) because of this. Regardless, this can't go on like this.
Diamond Head Brewery (DHB)
Carboy #1: Tallgrass Talcyon Wheat
Carboy #2: Full Sail Amber Clone
Carboy #3: Graff
In the Hole: Keg #5: Citra Pale Ale
Keg #1: Darth Vader (Black IPA)
Keg #2: Smash Ale
Keg #3: Amayson Saison
Keg #4: Citra Pale Ale