Do I need to replace up-flow evaporator coils when replace AC unit?


Old 06-18-15, 10:21 AM
Thread Starter
Join Date: Jun 2015
Location: USA
Posts: 2
Do I need to replace up-flow evaporator coils when replace AC unit?

I am looking at replacing our 16 year old, upstairs, central AC unit.

It is a 3.5 ton Lennox. I believe it is 10 seer and looking at replacing with a 16 seer 3.5 ton unit.

What is not clear to me is if I need to also replace the evaporator coils or not.

This is based on the evaporator coils are working fine. What is not clear to me is if coils and AC unit types have to go together or not. Also if new coils have improved in a manner that affects the seer number.

Also, if I do replace our coils are the Lennox C23-46-1 which is a relatively weird size of W X D X H of 19.75" x 22.75" x 15".

Looking at the coils that go with the AC unit I am looking at there are none that are very close in size. Our coils are inside the house, vertical and right above the furnace.

The suction and liquid lines are the same size as the replacement unit we are looking at so was not looking at replacing. Curious if in most cases people do replace. BTW, our basement is also finished so changing the lines would be a hassle.

Any help very much appreciated!
Sponsored Links
Old 06-18-15, 02:21 PM
Join Date: Feb 2014
Location: USA
Posts: 2,104
To achieve the 16 SEER you will have to replace the coil. No need to replace the line set, just make sure they are flushed out.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes