I found the individuals at Trotter Air extremely knowledgeable and friendly. Sean took time to show and explain to me all about the products that I was inquiring about. I had done a lot of research in advance. I knew what my needs were. And after discussing them to him, I realized that there was so much more that I had not considered. They were things that helped to reinforce my decisions. I am extremely pleased with the AC system they installed for me. After making the decision to puirchase the AC system, there were no worries, no delays, no tensions, no surprises, no disappointments, etc. Hopefully you're getting my impressions of this buisness. And yes I did purchase an additional item that I had not considered, being unaware of it. I believe most will consider it when discussing AC filter ratings and in home effectiveness. I paired it with the filter rating that I am confortable with for both health and technical reasons. Trotter Air can explain. Google 'REME HALO' and watch a few videos. Decide for yourself.