[Woogieman]

Originally Posted by ScareCrowe

I wanted to also address this because the bolded isn't really true. In some cases it can be, low end electric furnaces are still pretty simple. But any gas furnace is pretty complex at this point, and the high end ones can be very complex with DC driven inverters, variable speed blowers & exhaust fans & even variable capacity gas valves. Some of them even have proprietary computer style communication which can self diagnose issues.

Good info, thanks!