Hello!  We have already referred and recommended your products (and Airtech) to several of our friends and clients alike - we are extremely pleased with their work and service.  of the many trades that built our new home, Airtech was the one we probably enjoyed the most - their follow-up has been the best, and their installation was legendary (I cannot believe how little space they required to install 2 furnaces, etc - extremely efficient and professional workmanship.)  Thank you to Airtech & Lennox - great people & great product.