As most of you are aware, there is a proposal to change the Furnace Efficiency Requirements for the norther tier of states requiring 90+ % efficient furnaces as of May 1, 2013.
As of now, that is on hold pending actions in the court. There have already been two challenges to the proposed settlement, one by HARDI to change the settlement, and one by AHRI against the HARDI proposal. So until the court settles it, nothing is final yet.
So, what does this mean to you? It means that you can still install 80% efficient furnaces in the Northern tier of states. Depending on how the court rules, the 90+% efficiency requirement may be reinstated at a later date or, it could be voided all together allowing 80% efficient furnaces as in the past.
I will try to stay on top of this and let you know as changes occur but as of right now, you can install 80% efficiency furnace in the Northern Tier of states after May 1, 2013.