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I didn't insulate the thermostat on ours. If I recall, the instructions said to leave them open to outside air. I don't have the instructions anymore so can't doublecheck that. I'd be concerned whether the thermostats will trigger the heat tape to heat the hose in time to stop any freezing.
I also wrapped our hose with the foam insulation over the heat tape, then duct tape over that. I don't recall any warning in the instructions but I might have missed it. Or forgot. It's been over a year since I wrapped ours. I do recall the instructions say to not apply the heat tape to flexible pipe/hose but that's what we all do anyhow. It also says to not spiral the tape around the pipe but to run it parallel. I did mine parallel. I don't know why it would matter but apparently it does.
I think if I were you I'd uncover those thermostats. It might not hurt anything the way you have it but I don't think I'd risk it. Just my opinion. And maybe a little paranoia about freezing pipes.
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