The reason why I don't like air matresses when it is cold is simple.

What is an airmatress? A ruber/plastic bag that you put air into. So you have a single air pocket between you and the ground, which conducts the heat from that air pocker faster than you can warm it. Since it is a single, big air pocket, it takes a long time for you to heat it near to body tempurature in the first place, even if the ground wasn't stealing your hard won and well used calories from it. And the matterial itself usually has nothing in the way for heat retention- the only advantage that this would have over a hammock is that ever warmth has stayed in the air away when you get a gust of wind.

Foam pads, on the other hand, are a collection of little tiny air pockets (easier to heat) trapped in a semi-solid material.

Also, the air mattresses sometimes get brittle in the cold, and the moisture that you blew into it while inflating has a habit of turning into ice, which then turns into water, and is very, very hard if not impossible to get out in the woods, adding ot the weight in your pack.

For warm weather, sure, they work, but for the weight, I find a foam pad more comfortable.