I’ll start off by simply saying my experience with SumZero Energy Systems could not have been better and surpassed all my expectations. My initial consultation with their energy consultant went well and totally inspired my confidence in their ability to get the job done. The price was fair, even a little less than other estimates I received. Paul, my SumZero energy consultant had four separate estimates delivered to me covering various configurations of the mini-split system to me within a day after our meeting. Paul explained the technical side of this technology to me very clearly and made it easy to understand. He also explained the advantages of using the Mass Save energy rebate program to lower installation costs upgrade insulation in my home. The savings through the Mass Save program is amazing. The actual installation of the mini-split system went off without out the slightest problem. The crew showed up promptly on time and got right to work. They were polite, efficient and obviously experts at this process. The were extremely conscientious about laying out taps in the house in their work areas and the the place spotless. They were a stellar crew! My wife and I could not be happier. Now that the warm weather is here I’m taking full advantage of the mini-split system. It’s whisper quiet, super efficient and looks great. The bonus is I don’t have to lug and install the bulky and heavy AC window units ever again. YAY! If the rating system is 1 through 10, with 10 being the best, I’d give SumZero an 11. Look no further, hire SumZero for you mini-split installation. You will not be disappointed.