I have been spending a lot of time trolling hvac-talk.com lately. I have learned a
lot from it, like I have learned a lot from this site. They even have a person who seems to know everything HVAC like Jerry P knows everything home inspection. Maybe they are one in the same, and Jerry is there under an alias.

What a wonderful world we live in when I can can get help from real experts in their field (something I hope to aspire to someday).

The site even looks a lot like this one. Maybe its a standard product.