what is the highest efficiency gas furnace can be installed ...

[lmuncy]

what is the highest efficiency gas furnace that can be installed in an attic?

[Caoimhín P. Connell]

Good morning, lmuncy:

Your question lacks clarity. The efficiency of a furnace is independent of where it may be installed. If local code permits the installation of a furnace in a specific attic, there will be no restrictions on the efficiency, per se.

If you reword your question, you may get a better answer.

Cheers!
Caoimhín P. Connell
Forensic Industrial Hygienist


(The opinions expressed here are exclusively my personal opinions and do not necessarily reflect my professional opinion, opinion of my employer, agency, peers, or professional affiliates. The above post is for information only and does not reflect professional advice and is not intended to supercede the professional advice of others.)

AMDG