OUCH! That's a whole new twist to "Chicken Math!" We'll just add that number on to the cost of all those "free eggs" our friends and family think we're getting!That doesn't even take into consideration the cost of electricity to run the AC unit.
Most portable AC units in the $200 range are about 10k BTU, that would make it about 1,000 watts. That would cost about 11 cents an hour to run. If you were to use it six months out of the year, the electric bill would be about $500 a year.
Those are some expensive silkies.
I have 6 housing units. One has less than desirable amount of ventilation so I run a box fan blowing in the window at the roost in summer and winter.