Hi dwzemens,
All foam materials will be affected to some degree by temperature, humidity, and the length of time they are continuously compressed even if they aren’t specifically temperature sensitive so it’s really a matter of degree. Of course memory foam is specifically made to be temperature sensitive in a certain range of temperatures (and they are also sensitive to humidity and the length of time they are compressed as well) but this will also happen to smaller degrees to other types of foam materials as well depending on the formulation of the foam.
How this affects the sleeping temperature for a particular person will depend on all the many other factors that can affect temperature regulation outside of the foam materials used in the comfort layers including the fabric and any quilting in the mattress cover, the type of mattress protector you use, your sheets, your bedclothes, your bedding, and your sleeping environment which can all have a significant effect on temperature regulation which in many cases is more than the effect of the top foam layers in your mattress no matter what they are. Where you are in the “oven to iceberg” range will also play a big role in temperature regulation. There is more about the many variables that can combine together to affect sleeping temperature in post #2 here and the posts it links to.
Some people are more sensitive to temperature and can have temperature regulation issues on mattresses that most people wouldn’t depending on the combination of factors that combine together to affect temperature regulation but even materials like memory foam which tend to be warmer for most people than other types of foam will only have temperature regulation issues for a minority of people and there are usually enough solutions available that most temperature regulation issues can be solved or at least minimized to levels that are “good enough” for most people.
Phoenix