I've been in the HVAC trade all my life working on everything from simple furnaces to air to air heat pump, ground source heat Pumps to combination 20 ton roof top unitsInstallation and service both. Then theres building custom BBG systems in China town and fixing mistakes other amatures have created. I was starting to enjoy this forum but when Moderators feel they should give negative replies and votes because they only answer what they read on the Internet for answers with no real knowledge of the service trade, then it starts to get stale and people will no longer get the proper information they are after. Hats off to Tester101, you would be doing these people a favor by leaving!!