Cost of running the furnace circulation fan

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.

Having a heat wave!

Having a heat wave...  Da, da, da, da, daa...
Notice on the chart below starting on the 19th and 20th...
That is the result of air conditioning during a heat wave we are having in these parts.  Ugh, that bill is going to hurt!  There is still at least another day of these 30c+ degree days due to us as well!

Since I have to keep the family cool, I'm going to have to get to work on some improvements around the house.  I need some functional air register vents, some of the old ones barely close or open when required.  I need to evenly distribute the AC more upstairs.  The second floor still gets a bit warm.  I also need to get some window covering up on upstairs office window.  That is letting on too much hot sun.

Those last two days of yellow and red bars are costing me $4.08 where normally I would be spending $0.53 for those days, $3.55 extra!