Do you know what size your air conditioner is? In the world of building science, you'll hear a lot of talk about why. Briefly, they may not dehumidify as well, short-cycling wears them out quicker, and your home will probably be less comfortable if the air conditioner is too big.

1. A C Serial Number Lookup

How to determine the age and size of the AC unit: The age or manufacture date of an AC compressor is usually coded under the serial number portion of the. The photos and diagrams will help you locate the model and serial numbers of your equipment, if they are not found on your original warranty or sales invoice. Split Systems Two Model and Serial Tags identify Split System Equipment. The prefix designation applies to the whole family (series) of air conditioners from a 1.5 ton unit up to a 5 ton unit. In the case of 13 it probably designates the lowest SEER in the group. If it is a higher number however, the (16 to 30) rating probably only applies to the smallest and most efficient unit.

A C Serial Number Lookup

But to know if your AC is oversized, first you have to know what size it is. ( Note: This article is about finding the size of your existing AC, not determining what size you need.) Look for the label The good news is that most HVAC manufacturers make it easy to determine the nominal capacity of your air conditioner.