replying to Smarty , Shep wrote:
nobody wrote:

Thanks Ed for your reply and information. I just noticed that you have
taken the time to provide useful and helpful information which I
appreciate very much, and I am going to go with the copper / Lennox
approach. My very limited experience working with aluminum leads me to
the same conclusion you state and copper seems like the better choice. I
am guessing that aluminum is becoming popular more as a result of rising
copper costs than other, technical reasons.
Thanks again.


I did a little research, and it seems formaldehyde forms formic acid on
copper coils. Since the SEER minimum increase to 13, manufacturers started
making copper coils even thinner, which leads to faster corrosion and
holes caused by formic acid. Aluminum coils are not susceptible to this
deterioration and holes from formic acid.

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