Internet has been a tremendously valuable source of information for me. It is the first place I turn to whenever I want to find out about anything, literally anything. I have benefited a lot from information people have posted on the Internet, from all over the world. Now it is time to give back. I have been working in the business of HVAC (Heating, Ventilation, Air Conditioning) design for the last seventeen years. I have things I can share with you, with the humble hope that they might be of use to you when you search the Internet for help and reach here.