Updating indoor parts of 10 Seer AC unit

Sep 28, 2008 8 Replies
2 years ago I got a brand new Carrier 10 Seer AC on the roof.

Now, the furnace and evaporator is at the end of its life so it needs to be replaced.



But I heard that according to the new law since 2006 only 13 Seer and above are available.



Does that mean I have to get rid of this almost new AC condenser and change out everything for 13 Seer or above?



Or can I just change out the interior components with 13 Seer equipment, will that work with my existing 10 Seer Carrier? I think it's 2 ton.



No, you will not have to replace your condenser. A new furnace and evaporator should work fine with it.

15 years ago I put in 14 seer, keep your old unit, a new 16 seer would cut your electric in half.

You will be OK but I would recommend that you have an expansion valve in the new evaorator coil.

OP may not get good warranty using existing parts. I would price both ways and decide then

What would the expansion valve do in this mixed configuration?

That is good news! Can I mix and match brands, for example use Trane coil, air handler, and furnace with the Carrier condenser? In other words can I use "just about any" indoor equipment bundle with the 10 Seer rooftop AC unit? Is is mostly the indoor portion that affects the efficiency the most?

On Sep 28, 5:16=EF=BF=BDpm, "scorpionleather" wrot= e:

the outside unit largely sets efficency. new outer uits are much physiically larger

thanks... now, that's what I'd really like to find out. If I use my existing 10 Seer condenser with a 15 Seer indoor coil, should I expect to get somewhere closer to 11 Seer, or 14 Seer, or somewhere in-betwen when I mix & match like this?

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