Originally Posted By: Phoenix42
Do any furnaces have an OBD2 type port? Or do they all do the flashing LED as their peak form of diag output?
According to this article ;
Quote:
Energy Star has issued its Most Efficient Furnaces of 2013 list, which features equipment that achieves efficiencies of 97 percent AFUE or higher. In addition, furnaces on this list must include two-way communications with the system controller, automated configuration, a thermostat or other control device with a user interface that can be located in the conditioned space, and fault code transmission to the indoor controller.


Unclear whether there is any standardization on the smart link(s) between furnace and controller, or proprietary in each case.

Originally Posted By: Carrier
... Pairing the furnace with the Infinity Touch Control allows remote Internet access, so technicians can prepare for service calls in advance...

... The Infinity Touch Control is the brains behind the Greenspeed intelligence system, with the ability to manage temperatures, humidity, ventilation, airflow, IAQ, and up to eight zones. Featuring simple intuitive programming and Wi-Fi-enabled remote access via Internet and Apple® and Android™ smartphone or tablet devices, it is a very user-friendly control, said the company


Here is the Energy Star 2014 most efficient furnace list