The booster fan is an interesting idea. You might want to change or rephrase your savings estimate though. Our electricity bill averages about $70 per month. I'd love to save $150. :)
Here in Florida the big two power co’s charge by the killowat hour. If you go over 1,000 hwh you pay a higher rate and also a higher fuel cost. By lowering my bill to 950 kwh I’m at $122 instead of $250 with my dryer. Not using the central air conditioner in the hotter months save around $250 per month. It’s not as cold inside but you get used to it. We have individual ductless room a/c’s from Sanyo that cool us. Very efficient.