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Question DetailsAsked on 8/2/2016

How do I size AC un cased evaporator coil so I can buy new one?

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There is normally a manufacturer plate on it, showing make, model number, type of gas it is designed for (sometimes), pressure rating, BTU/hour rating, and commonly a serial number. Course, some manufacturers get lazy and don't put all that on - but hopefully.


You use that number to order a replacement - if out of production then usually there is an aftermarket one with the same rating available. If no labeling on the coil, knowing the model number of the A/C system, or lacking that high and low pressure rating and BTU rating and gas type and lineset size of the overall system is also enough to specify a new evaporator coil from a wholesaler's catalog.


Course, you cannot legally change it out without the proper gas recovery and recharging equipment (which costs around $1000+) and EPA license so your need a contractor to do the job anyway even if you proficient at soldering copper pressure tubing, so getting the replacement coil yourself can backfire. Many HVAC companies will not install a unit they did not provide, and if they did not provide the coil almost certainly will not warranty the installation, plus in many cases the manufacturer's warranty on the unit is valid only if installed by a licensed HVAC contractor - or in some cases only if installed by a contractor certified by the manufacturer.


Also, buying the unit yourself may seem like it should save you money, but in many cases parts markup is the primary source of profit for the contractor - so right or wrong, fair or not, many will charge you the profit they would have made on the unit anyway - some even the whole cost of a new unit - as part of their lump-sum installation charge.


Lots of previous questions with answers in the Home > HVAC link in Browse Projects (at lower left) where you can read about coil replacement issues and typical costs, and about the economics and warranty and energy efficiency/operating cost issues of replacing a coil versus replacing the entire unit if you have an older (generally defined as 10 years old) system.

Answered 2 years ago by LCD




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