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Question DetailsAsked on 10/16/2013

Can a 7 year-old Trane 4-ton A/C unit successfully have a non-Trane evaporator coil used for replacement?

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2 Answers


It is not the recommended thing to do, will it work, probably.

A non-matched coil will not be the same efficiency, and could cause othe issues, the compressor may fail early, the refrigerant charge may need to be adjusted for summer versus winter operation, if it's a Heat pump.

For efficiency reasons it is not permitted in Florida by code.

Soucre for more info.; www,


Answered 6 years ago by BayAreaAC


Yes, if it is designed to run at the same coolant pressure, and is matched thermally - has the right heat exchange area for the design conditions and matches the output of the A/C unit. Failure to get a proper match can result in inadequate cooling, overworking of the A/C compressor, or icing of the evaporator, all of which lead to further problems down the road, so the sizing has to be done by an A/C professional familiar with system ratings and thermal evaluation, not just a service tech.

If this is a Freon unit, you should read the answers to Freon (R-22) questions in the Home / HVAC category, because refilling this unit in the future could be prohibitive in cost, so with a 7 year old unit you are probably about at the point where considering a whole new system with the newer replacement gases might be a smart move. You don't want to sink the better part of $1000 into a new evaporator unit just to have to replace it when your current unit needs replacement in a few years, as a new evaporator will most likely not be compatible with the new system because of different operating temperatures and thermal transfer characterisitics of the new gases. Also, if you current evaporator failed by mwans of a hole that lost the gas, you might be looking at up to $500 for the gas refill alone - which could drive your new evaporator cost up to half the cost of a totally new unit.

Answered 6 years ago by LCD

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