I was not impressed at all.  First they checked my air conditioner and after the 1st guy left, I found the low pressure Schroeder valve was leaking at my unit that would have drained my entire system and been a huge bill to re-fill.  Months later when I went to use my AC unit (I use an evaporator cooler most of the summer), it would have been empty of Freon and I would have had no recourse with them.  When I talked to a professional in the field, he said that's what some companies do to get business, like it was a common occurrence.  I don't have proof of that obviously but some companies or employees are not honest. Next they did a fan test that blew ashes from my fireplace throughout my house and my wife was thrilled with having to clean ashes from all over the house.  After all that, when they came back a week later to tell me about results and rebates (I thought), I was not told anything about the performance of my house or duct work or any possible NV Energy rebates, I was told about house insulation (insulation price was OK), a solar water heater system (way too expensive - I'm all electric and we are getting a heat pump hot water heater less than half the price) and a solar panel install price that, even after I showed them some of the prices I had been getting from several solar companies, was still 20% higher????  I took the time to write this because they wasted A LOT of my time and I have nothing to show for it.  I was actually interested in possibly having then do some of the rebate work (cleaning coils, duct sealing, etc.) and I was interested in knowing how inefficient my AC unit was (even though I don't use it much and won't replace it for years assuming they did no other damage to it) but they never presented any of that to me.  My opinion is that they are mostly only interested in selling the high profit products.