Jerome,

There are evaporator coils that can be used for two different tonnage units. If you go to this web site
Evaporator Coils (Cased) and then scroll down you will see what I am talking about.

As an example, go down to CAPF3642C6 and you will see that it is rated for 3 to 3.5 tons. Now click on the model number and go to the next page. Goodman CAPF3642C6 - Buy Online This explains how the orifice is changed depending on what tonnage you need.

Part of the problem is reading the model number and trying to decide what the rating of the coil is. Every manufacturer does it differently.

I agree with what Jim has said. He knows what he is talking about. If you are in doubt about matched units, give the manufacturer a call with the model numbers from the condenser and evaporator and see what they say.

In my reports I say something like this: I do not have the ability to determine if you have matched units for capacity or SEERS. If this is an area of concern to you, please contact the manufacturer or an HVAC contractor for additional information.

Jeff Euriech
Peoria Arizona