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How to add insulation to a hollow core exterior door?

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During some renovations to my house and I removed some wood-paneling and uncovered an exterior door. The door faces west, so it gets the late afternoon sun and in Phoenix, the door gets hot.

Typically, I wouldn't be concerned about an exterior door but it's a hollow core door which lets in a lot of heat. I can't afford to replace the door with something that is solid, yet, so I'm trying to figure out a way to provide a bit of insulation to it.

The door looks like this:

enter image description here

While we will not be using to enter/exit the house at this time, we'd prefer to leave the door somewhat accessible. This is eventually going to be the main entry door into the house, but if we aren't able to insulate it at this time as is, then we'd consider covering it again.

Since it's hollow core, I know it has the honeycomb interior so using spray foam would be really difficult.

I was thinking about purchasing some rigid insulation foam board, attaching it to the door, then attaching a piece of wood on top of it. My reasoning is that it would give a bit more protection from the heat of the summer and the cold in the winter.

Does anyone have suggestions on how I could insulate this door?


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