Hi photocat,
You’re not hijacking the thread. You would first start by reading the information I’ve offered earlier in this thread regarding temperature. This information will assist you in choosing products that have the best chance of success in controlling the microclimate of your mattress. Some of it is presented here again for your ease of reading.
In very general terms … the materials, layers, and components of a sleeping system that are closer to your skin will have a bigger effect on airflow, moisture transport, and temperature regulation than materials, layers, and components that are further away from your skin and softer mattresses or foam toppers will tend to be more “insulating” and for some people can sleep warmer than firmer versions of the same material.
It’s not really possible to quantify the sleeping temperature of a mattress for any particular person with any real accuracy because there are so many variables involved including the type of mattress protector and the sheets and bedding that you use (which in many cases can have just as significant an effect on sleeping temperature as the type of foam in a mattress) and on where you are in the “oven to iceberg” range and because there is no standardized testing for temperature regulation with different combinations of materials … there is more about the many variables that can affect the sleeping temperature of a mattress or sleeping system in post #2 here that can help you choose the types of materials and components that are most likely to keep you in a comfortable temperature range. This post and what it links to has an incredible amount of information about mattress temperature regulation.
Other than that, careful testing in person of a mattress you’re considering will tell you an incredible amount about the appropriateness for yourself. Plan to spend a decent amount of time on the mattress to see how you respond. If you’re shopping online, be sure to familiarize yourself with any potential return/exchange policies in case what you purchased doesn’t work as well for you as you had hoped.
Phoenix