Spent one week on a Sealy posterpedic cushion firm innerspring at my parents house.  It was not very thick and stuffed with a lot of foam.  Pretty bare bones by todays standards (they got it about 7 years ago). They did not know how much they paid for it, but I assume one of the cheaper ones (I don't think they would spend a lot for the spare room).  Definitely felt firm and had pressure points.  However, I seemed to sleep pretty well.  Slept more hours than usual (possibly due to vacation aspect?).

Did not seem to get too hot or too cold.  Not sure if the difference in blankets had anything to do with it.  I have read that a firmer mattress will be cooler because you sink in less and have less contact with the surface.  There may be something to that.

No aches or pains in the morning, but perhaps felt a little more beat up from the firm surface.  Comfort wise, I would have a preferred an inch or 2 of nice foam on top.  Overall the latex bed definitely feels more comfortable.

The moral of the story is that I probably can take a firmer mattress than I thought.  I also had a Sealy Posterpedic for 22 years prior to my recent attempts at finding a new mattress (with 2" of added memory foam the last 5 years).  Also, it seems to confirm that latex holds heat more than an innerspring.

So, I am now wondering if I am better off with a relative cheap innerspring with possible addition of some latex and or memory foam?  Not sure if adding 2" will bring the temperature right up to the level of a pure latex mattress.  I have a cheap innerspring in one of my spare rooms (full size though), so I may add something to that to check the temperature level.  I don't remember having as many temperature issues on my old Sealy plus the 2" of memory foam.

One of the cheaper queen Sealy's (not much foam) on US mattress goes for $550 with 732 coils and 14 gage.  Not sure if that is good enough springs. 

Meanwhile,  I am getting 1" of Celsion latex tomorrow.  Will see if that has any impact on temperature issues for me.