Pond Boss Forums GENERAL QUESTIONS Help Pex radiant heat installation

Who has experience with pex heating in an under-floor application? I haven't set my sights on any specific heating system for our gar/apt project. It dawns on me that if we are planning on heating a 15 x 28 slab for a shop area on the first floor, maybe we should consider pex radiant heating under the subfloor of the 2nd floor, about 1100 sq ft of living space.
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One of the potential issues that I do see is that, in the winter, we will want to be able to shut everything down when we are absent, so it must remain frost-proof. I assume the heating fluid medium can be tempered with glycol or some sort of anti-freeze. When we do arrive on a Friday night, and the inside of the living space is 25 - 30 degrees, we are not going to want to wait for a radiant heat system to warm up. Yes, there will be a wood stove, but I know from experience with a previous summer home that a standard gas fired furnace really moves things along during warm-up.
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Gimme some thoughts...

We did pex floor heating in our entire basement, entire garage, entire master bedroom sitting room (which is an open porch underneath), and 2/3 of the second floor above the garage.

We should have done the whole second floor above the garage.

Frankly, if I ever build a house again, the entire house will have floor/water heat.