Heatmap charts are similar to treemap charts: they both use a similar system of color-coding to represent data values. However, the heatmap chart does not use size to measure data, and instead requires an additional attribute.
The value of each cell depends on the measure you choose under Edit chart configuration.
By default, the heatmap color is teal in various shades. You can change the heatmap color under chart configuration. To change the basic color the heatmap uses, follow these steps:
Navigate to any heatmap chart that you have edit privileges for.
Select the chart configuration icon on the left side of your screen.
Select the chip for the measure under Value.
Click the Color drop-down, and select one of the options in the color palette.