Great product! We started saving money the day we installed! We live in Palestine, TX where the average temperature is 90 to 105 in the summer. We run a 5 ton air conditioner,5 ceiling fans, hot tub, swimming pool and 3 refrigerators. Our electric bills in the summer were $400 plus before our Power Management unit and now our electric bills are around $300. We are experiencing 25% and more savings on our energy bills. The unit is completely quiet and requires absolutely no maintenance. I have recommended this product to my entire family and friends. Depending on how much electricity your household uses it can pay for itself in 3 to 6 months. We have had ours since December 2012 and figured it paid for itself by March 2013. Don’t be penny wise and dollar foolish. After 3 months of energy savings the unit is paid for and you save on your electric bill for as long as its connected.We are saving at least $1200 per year, if we stay in our home for 10 years that is over $12,000 in savings. The unit can be professionally installed. I felt comfortable hooking it up myself and was done in about 15 minutes. So easy I will take it with me if we decide to move into a new home.