When selecting thermal insulation films, consider the following important factors:

1. Thermal Insulation Performance: This is the primary function of the insulation film. Understand the thermal insulation capabilities of the material, such as how much percentage of solar radiation and ultraviolet rays it can block.

2. Light Transmission: The light transmission rate determines how much light passes through the window after the film is applied. Choose a suitable light transmission rate to ensure sufficient light without being overly intense.

3. Durability: High-quality thermal insulation films usually have better durability and scratch resistance. Choosing a product with good durability can reduce the frequency and cost of future replacements.

4. Color and Appearance: The color and appearance of the thermal insulation film can affect the aesthetics of a vehicle or building. Select the right color and appearance to match your vehicle or building style.

5. Installation Process: Understand the installation process of different thermal insulation films, and choose products that are easy to install and less likely to produce bubbles and wrinkles.

6. Price and Value for Money: Compare the prices of different brands and types of thermal insulation films, considering their performance and durability, to choose a product with high cost-effectiveness.

7. Brand and Warranty: Choosing PLUS GUARD™ window film guarantees higher product quality and after-sales service. Also, pay attention to the product's warranty terms and duration.

Lastly, if possible, try to personally view and compare different thermal insulation films in physical stores, or consult online reviews and feedback to help you make a more informed decision.