Hi demeter,
Regarding the 14" Haven Lux Pillowtop hybrid on the Canadian market, Haven does not provide on their website the density information of the layers that make up the top 3.5 inches of the bed, that would allow to comment and analyze this mattress. If you find the information listed here and post it in this thread here, I’d be happy to comment upon it.
It seems that you did a bit of research on mattress temperature regulation issues but just in case you did not come across post #2 here you can read more about the many variables that can affect the sleeping temperature of a mattress or sleeping system that can help you choose the types of materials and components that are most likely to keep you in a comfortable temperature range. You are correct that Latex itself is a quite breathable material and being the uppermost layer within the mattress would have the most effect on airflow, moisture transport, and temperature regulation than any materials, layers, and components that are further away from your skin. Pocket and micro coils core is one of the most breathable types of cores that can help with breathability and ventilation … I’d also keep in mind that the top Latex layer is 1" thick I am not sure how much heat would be trapped by the 3.5" of memory and poly foam between the latex and the coils. While it’s also not always possible to track down temperature regulation issues for any particular person on a specific mattress because there are so many variables involved (including your room temperature and humidity, your sheets and bedding and bedclothes, your mattress protector or any mattress pads you are using, and where you are in the “oven to iceberg” range) and some people can sleep warmer on mattresses that most people are generally fine with … since you are “testing” and have the Novosbed experience, maybe when you “test” the next bed, you will at least have something to compare it against.
Alpacas of Montana has a good article comparing alpaca fleece versus sheep’s wool. Wikipedia has a good article here on Alpaca wool. It’s generally finer and lighter and warmer than many types of sheep’s wool and similar to Merino wool (which is a breed that produces softer finer wool). It will tend to be less “lofty” than wool, and it is often blended with other fibers. Of course, the overall warmth will be dependent upon the amount of fill in a comforter, but in a similar diameter fiber, the alpaca will be more insulating that wool fiber.
If you are considering an alpaca comforter, you may wish to request a small sample of the fiber beforehand so you may gauge your potential reaction to the product before placing an order.
Looking forward to any further updates on your testing and temperature regulation decisions.
Phoenix