What kind of units does he normally get? If they're Goodman, you can get great prices online. I bought two furnaces from
www.alpinehomeair.com and had a local guy install one of them. I did the other one before I found out that city hall requires a contractor to do it, permits, BS, etc. They have really good customer service and help lines, double the normal warranty and while I have read comments in builder's forums saying that the sheet metal was thin/inferior and they have problems, they use the same control boards as just about everyone else and I can say without a doubt that the sheet metal was heavier than what it replaced. Both have operated perfectly and are very quiet.