How big of a incubator are we talking about?
Table top job can't use much more electricity than a 100watt light bulb. It would take a huge cabinet model incubator to use as much juice as an A?C unit. Most every appliance I have ever bought has a power usage tag on it.
Here you go--
Brinsea Poly hatch
Specifications
Egg Capacity: Quail 100, Pheasant 64, Chicken 42, Duck 35, Geese 16-20
Egg Turning: Automatic
Weight: 12 lbs
Power and Electricity: 110 Volt AC, 25 Watts on average
Sportsman 1502
Power and Electricity Specifications
110 Volt AC 225 Watts
Way less than a fridge. You might be able to see the large Sportsman cabinet model on your electrical usage, but no way would you see the
Brinsea table top. Unless you have very little electrical usage to start with, like no fridge, no washing machine, no hair blow dryer, only using electricity for basic lighting. A fridge when it is running uses somewhere around 800 - 1200 watts, a small TV can use a couple hundred watts.