I've been lazy and never wrote up the results from this experiment.
I had a heated monotub and a nonheated monotub. Both treated the same otherwise. House temperatures usually in the low 60s.
The heated tub was set to 74F
1) The nonheated tub fully colonized just a day behind the heated tub
2) Despite not being heated, the nonheated tub stayed approx 10F warmer than the room temperature throughout colonization. During fruiting, the nonheated tub stayed approx 6F warmer than the room temperature.
3) First flush at the same time for both tubs. Neither was faster than the other.
4) First flush for heated tub was 102g dried. First flush for nonheated tub was 85g dried. Strangely the first flush for the nonheated tub was all in the center. I wonder if it's because the center of the substrate had more heat from the mycelium metabolism as opposed to the edges. In subsequent flushes the pinset evened out.
5) The heated tub never had another flush because it erupted in mold almost overnight. Wow. Threw it out.
6) The nonheated tub gave 3 more flushes (29g, 37g, and 20g)
Since I had to throw out the heated tub I'll never know if it would have produced a heavier yield.
I would have to test this again to be more certain, but it seems that heating is not absolutely necessary and maybe it actually encourages contaminants. I know that is what a lot of you say, and I should just listen and follow, but I had to see for myself.
Next round I think I'll scrap the heat mats, and maybe just use them in winter when my house is so damn cold.
Anyway, 273g is not so bad at all, and would have been even more had one of the tubs not contaminated. I am eternally grateful for the wisdom in this community and the kind member that shared their redboy spores with me. Yay!!! I am happy.