1. Find the labeling machine: There will be a sticker or label on the outside or inside of the air conditioner. This sticker contains the brand and model information of the air conditioner.

2. Look for the brand logo: Pay attention to whether there is a logo with the word "Haier" clearly displayed on the sticker. This is the trademark, name or other specific indication of the Haier brand.

3. Model verification: After finding the brand information, you can also search for the model to confirm whether it is related to Haier. You can use an Internet search engine and enter the air conditioner model and "Haier" in the search bar for comparison.