Replacing an old A-Coil to match the Payne PA10

[tguyette]

I recently moved into a townhome that has the old 1971 Heil furnace.
It is reportedly about 60% efficient and has 0% CO out the flue.
I considered adding a 95% efficient furnace and even had the installer out here ready to install and he could not find a place to do the venting due to the layout. Bummer.
In the process of asking questions, I had one person tell me that if I replaced the A-Coil on my unit that I would need to use a seer that matches the outside unit (I think called the condenser). The outside unit is a Payne PA10 which has a seer of 10. Is this really necessary for the longevity of the operating pair?
I am in need of making the installation as inexpensive as possible and still be long lasting. I have a place to get used A-Coils and maybe someone knows where to get new seer 10 A-coils. I need a 2 ton A-coil.

[beenthere]

The indoor coil can be a Higher rated efficiency then the outdoor unit.

Don't get a used coil.
It could start leaking a couple days after you paid to have it installed.
Then your just out more money.

[the dangling wrangler]

I am in need of making the installation as inexpensive as possible and still be long lasting.

Nothing is impossible, but, that's pretty close. ;)

[BaldLoonie]

You may be stuck with an 80% furnace. Even that would beat the old one in heating costs.

Is the indoor coil left over from 1971 or was it changed when the Payne was installed? If it is matched to the Payne it doesn't need to be changed. Otherwise, it should be.

[Willserve]

I agree, don't put in a used coil. Just like telling your kids not to put money in thier mouth because you don't know where it's been. Why spend money on a chance like that when it could lead to leaks and head aches. An a/c contractor can find you a match and get you going.

[tguyette]

I have found new 10 SEER a coils available on ebay and would like to have that available for replacement if the if once the furnace is removed, the a coil is bad. I need to keep costs down for now as my income is pretty low right now. Also my old furnace runs great so maybe I do not need to do anything. I have purchased a Aprilaire Media filter that I would like to put in place so maybe I just need to replace the return air drop to put the filter in and let things go for right now.

[beenthere]

If those 10 SEER coils you found aren't rated matches to your outdoor unit.
Then you still have no idea what capacity reduction you have.
And may be worst off then switching to a new coil rated for 13 SEER equipment.

[tguyette]

By Rated matches do you mean how many tons?
These I found are all 2-ton units and my PA10 is 2 Ton.

[beenthere]

No.

ARI rated to work with your outdoor unit.

[tguyette]

so there is more than just matching tons and SEER rating. What does the ARI rating mean? Anywhere I can read up on it?

[beenthere]

It means its certified to have X capacity under X conditios.
Those conditions are 95°F outdoor temp, and 80°F drybulb, 67°F wetbulb temperature.

ARI website, to read up on it.

[tguyette]

would that be AHRI: http://www.ahrinet.org ?

[beenthere]

Yes. That is what it changed to now.