I don’t know if we’ve covered this already, but an airlock from the garage into the house is a complete mystery to me. Unless the airlock incidentally adjoins the wardrobe that was already planned by the main entrance, I think it’s completely pointless.
Most people plan access through the utility room. Yes, but what is that supposed to achieve? Now I’m standing in the utility room with my clothes, so what? Do I take off my shoes here and carry them to the wardrobe? And what did that get me?
A covered main entrance from the garage is much better.
Since such an airlock also wastes a lot of space, in the end I have an expensive second entrance with little benefit, more dirt, increased risk of burglary, and probably loss of necessary space for cabinets etc.