Dave,

Your protection idea sounds great! I can really appreciate all the hard work and thought you put into this to making palms work for you in your area.

I only have one minor concern that I'm sure you already know but I'm going to say it anyways just in case. Heating the ground to those temps will seriously dry out the roots during winter. I'd suggest keeping a very close eye on the soil to make sure everything stays happy. If you went through all this work you know that anyways 😉

Very cool man! I've come up with a very similar idea that I'll be using in my next home.

Bill