So I seem to be having trouble with my power bills (they've often been near $400 while other people in my area with a similar sized house usually get around $140), and I've isolated the issue to my air conditioner (I shut the AC off during the day one day and saw that my power utilization instantly went down, we have smart-grid so the power company reports on an hourly basis on a website).
At first I started sealing just about everything I could think of (made sure my doors closed tighter, sealed off my fireplace, and used foam insulation just about everywhere I could think of) to get a tighter air seal.
I also had my AC system serviced (they added about 3/4lb of Freon and cleaned the evaporator coils), and replaced my filters and cleaned the coils on the compressor outside.
In spite of this, I'm keeping my house temperature around 80 degrees (it's usually 92-97 outside right now), and it's making very little difference that I can see during the heat of the day. My ecobee3 is reporting that the system runs nearly non-stop in the afternoon.
The HVAC tech tells me that the system is doing just about as much as it can do, and what I have is what I have. My house is 2,100 square feet and I have a 4 ton unit, which he tells me is appropriately sized. I use the older R-22 style coolant as well (unit is about 12 years old).
Is there anything else that can be done to help with these high power bills? I know my attic is pretty hot during the day, and when the AC first turns on, it feels like the heater is turned on. I've thought about putting a fan and some duct-work up there to try and build a cheap ventilation system to try and cool it down some, but I'm not sure how much that would do.