Our ClimateMaster Tranaquility 27 5 ton unit was installed in 2009. We saw a significant spike in our power bill for the last two months.(typical $300.00 now $890.00) Our electrician came out for an hour and measured the amps, but didn't find anything. So, we contacted our board of public utilities and they put a recorder on the house. We were told that something draws a large amount of power, up to about 100 amps., then bottoms out and spikes to 200 plus amps for about 1/2 hr. It then repeats this every 1 1/2 hours. We live in southern Michigan, and it hasn't been cold enough for the electric to kick in. In addition, we keep the thermostat at 66-68 degrees. The Geothermal unit was serviced in the early summer because it wasn't cooling enough and they found a freon leak, fixed it and we didn't have another problem. Any suggestions on what would cause this? Thanks.