Which A2L indoor units ship with leak detection

A2L equipment needs refrigerant detection somewhere in the indoor unit. Some manufacturers build it in and say so; some require a kit; several have published nothing we have been able to read. This table only claims the first and third, because the second needs a document naming the kit.

22 indoor units across 2 brands: 16 ship with detection installed, 6 have no published answer. In the last column, Factory means the detection system is fitted before the unit leaves the factory, Kit means the installer fits one on site, None means the manufacturer states that none is needed, and Not published means it has not answered.

One thing worth knowing about how the Carrier rows were arrived at. Carrier's answer is about fan coils as a class — it says all of them ship with detection installed — and it names no model numbers. Which models are fan coils comes from the distributor's transition guide. So a Carrier Factory row is two documents joined, not one sentence about that model, and the cased coils say Not published because Carrier's sentence was never about them. Ask your installer to confirm it for the model on your quote.

The two brands here do not answer the same question

This is the reason the table exists, and it is visible in the rows above.

Carrier says that all Carrier fan coils ship with a full leak detection system installed. That is a sentence about fan coils. It does not make the same statement about its furnace coils, so those rows say nothing rather than borrowing an answer written about other equipment.

American Standard says something different and broader: a Refrigerant Detection System — a leak detection sensor and a mitigation control board — is mounted to the coil, across the coil product family. It also names a consequence Carrier's document does not: a new factory-supplied wire harness runs from that system to the furnace, and somebody has to connect it on site.

So a homeowner asking "is the detection already in there?" gets a yes from both — and only one of them warns that there is a wire to land between the coil and the furnace. That is the sort of difference that never survives a generic article, and it is why every row here names the document behind it.

A blank is information too. It is the question to put to your installer in writing.

This is a starting point, not an approval. Everything here is read from published manufacturer documents and dated, but only the licensed contractor who signs your installation can approve a specific system for your home and your local code. Take the citations on this page to them and ask.