How do I find out what size AC unit I have?
Confusing equipment labels and a lack of documentation make it difficult to know what you are looking at or what size AC unit you actually have. Without clear specifications, people cannot figure out whether a 12k BTU capacity is enough or if an 18k unit is required for hot summer conditions.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Reading the model number or specifications on the outdoor unit label
- 2Checking the installation booklet left at the indoor air handler
- 3Posting photos online for professionals to identify
- 4Estimating based on supply and return air temperatures
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“I’m mainly trying to figure out whether 12k BTU is enough or if 18k would be more appropriate for Arizona summers.”source ↗
Dry_Frame_7879 · r/hvacadvice · 1 upvotes
“I can’t seem to find out what size unit I have.”source ↗
Civil_Swordfish_1684 · r/hvacadvice
“I have but I don’t really know what I’m looking for.”source ↗
Civil_Swordfish_1684 · r/hvacadvice
Where this came up
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