Hi hostage,
Welcome to the Mattress Forum! … and I’m glad you found us
While it’s not 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 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 your wife in a comfortable temperature range.
Based on your comments about the temperature equalizing with gel materials over time it’s likely that you’ve read this already but there is also more information about gel foam materials in general in post #2 here. As you mentioned … the effect of gel tends to be temporary and generally doesn’t last over the course of the night.
There is also a little more about different materials and components relative to motion transfer in post #18 here.
I would also keep in mind that while other people’s comments about the knowledge and service of a particular business can certainly be very helpful … I would be very cautious about about using other people’s experiences or reviews on a mattress (either positive or negative) as a reliable source of information or guidance about how you will feel on the same mattress or how suitable or how durable a mattress may be for you and in many if not most cases they can be more misleading than helpful because any mattress that would be a perfect choice for one person or even a larger group of people may be completely unsuitable for someone else to sleep on and reviews in general certainly won’t tell you much if anything about the quality, durability, “value”, or the sleeping temperature of a mattress for any particular person (see post #13 here).
The better options or possibilities I’m aware of in and around the Rochester area (subject to making sure that any mattress you are considering meets the quality/value guidelines here) are listed in post #11 here.
Phoenix