I called ASI when my 9 year old Carrier furnace wouldn't turn on. I suspected the thermostat but decided to call the pros. They had done repair work for me once before and I was satisfied overall. Like any professional repair business, they are not inexpensive and the unexpected $400 really hurt. Hey, they're in business to make a profit like anyone else. However, Mike worked diligently to resolve the problem, over-riding the thermostat to show me that the furnace was working fine. Then I asked if the furnace needed any servicing while he was here. Before I asked, there was no ""up selling"". Mike did indicate that all new units have a surge suppressor hard wired to them to prevent costly damage to computerized parts and more. Hmm. I paused with this new information for a moment remembering how I once fried a cell phone that was charging. Following the ""Law of Attraction"" I knew that NOT installing the new surger would likely mean my attention would be on something getting fried and then it would. $200 peace of mind, at least until I get better at setting my intentions. It should be said that Mike didn't push it and that helped to make the decision easier because it was MY decision. I'm sure I could have replaced the thermostat myself, like I repaired a toilet, installed a faucet, tiled a kitchen, etc., but I know nothing about electricity, and that could be foolish at best. As long as they do a good job and stand by their products and installation, then it's money well spent.