Radiant systems need a nontoxic propylene-glycol antifreeze that also has an anti-rust ingredient in it. This type of antifreeze would also be used in wet heating systems.
ice clear anti-freeze
There are several types of antifreeze that you can use in radiant (in floor) heating systems. Some people use a 50/50 mix of glycol and water, while others want to go the non-chemical route or a specific in floor heat antifreeze.
My first instinct is to say "Your kidding me rite?". However, I'm curious, why do you fell you need to winterize your AC unit?. My second question is what type of AC unit do you have?
Inhibited propylene glycol if you are using antifreeze instead of water, But I do not understand why unless it is a vacation home or something along that line.
An electromagnetic wave is a radiant wave.
It depends on what type of radiant energy you're talking about
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The type of car antifreeze that is safest to the environment is propylene glycol antifreeze. While it is still not totally safe, it is less toxic than other antifreeze.