If your brand is not listed, send me a photo via email or text of the tag that clearly shows the model and serial numbers. I have a 100 page book, but I cannot list them all here.
There are many different HVAC system types, we’ll focus on the HVAC brands that make up 90% of what is commonly installed in the US and how to identify what HVAC brand you have.
The HVAC serial number is generally encode their age. Many manufacturers do it differently and most have changed the way they do it over the years. Below are the most popular brands and how they encode the year within the last 20 years or so. For older equipment Google can be pretty helpful.