I decided to work out what it costs to run my furnaces air circulation motor. I thought running the circulation through the night without the AC on would help get the cooler air from downstairs to upstairs as we slept.
It seems to be helping, I don't think the AC was activated too much overnight.
Here are my calculations.
Typical late night hourly power consumption when not much is going on is 0.20 Kwh
Typical late night hourly power consumption when fan motor is on is 0.30 Kwh
So this difference of 0.1 Kwh is my basis to calculate how much the fan is costing me.
Off peak is 6.5 cents for 12 hours a day
Mid peak is 10 cents for 6 hours a day
Peak is 11.7 cents for 6 hours a day
This works out to 20 cents a day rounding up.
So conceivably running the furnace fan every day of the year can cost me $73 a year(or another way $9 a month).
Well, thats nice to know. Now to decide if that is affordable or not.