Very unobtrusive while installing new system. Informative for the most part. A little pushy on needing air ducts cleaned even after I said no and why. That is probably my only negative. Other than the fact the heat pump is advertised to work at much lower temperatures than they will set it. Kind of redundant to buy one if it only works at 40 degrees. We spent the extra to save on our gas usage and had to beg to have it set at 30. Not at all impressed with this.
