I have been using Airsmiths Home Performance for about a decade now. I am a general contractor, and I use them with my business for customers as well as at my own home for personal projects and service. This last time they came out to do some minor maintenance on a system they had previously put in. When they put the system in. it was a high-efficiency system, and I have seen really good results. They are great about testing out results and doing what needs to be done to have good results without wasting time and resources on unnecessary items. They have excellent customer service and are very responsive. They are very good at getting back to me both by email and phone. It has been an excellent experience overall throughout the years, and I recommend Airsmiths Home Performance all the time!