Hey guys I need some advice. I have a Bryant heat pump model 698ANo60-B, serial #2594E08044. I just bought this house 2 months ago and have no history with this unit. My Air handler blower motor went out last month on a week end. The service guy did not have a replacment vari speed motor so he installed a single speed. He also jumped my thermostat out to run the unit on high speed. I just got my next moths bill and was schocked to find a $525 bill. This is a 2200 sq ft house in South Louisiana. Will the changes that the tech made to the unit make that much of a difference in energy? Also I just checked the low pressure side of the unit and thought that it was high 85 PSIG? One other thing I only have an average of 10F differential air temp.?