Will check that on monday, will be +5c here (WOW), will unwrap palms and take pics...but the heat tape is enought, temp. never went down under -2c even at -27c outside.
Ben

There s some pics of my smaller Trachy with having a fungus problem i think. Im using the same technic than my taller one who has just few tips burned. I don t know whats going wrong with the smaller one. I was using a old arbotex to wrap it first, but im not sure that s the cause of fungus problems. The mummy wrapping is not hermetic and some air can go inside for a bit of ventilation. Like a said before, the T3 was nt working for a night i think, the probe indicated -14c a morning in december and then, the cable started to warming up again...

Ben

I think fungus is the least of its worries.

some air can go inside for a bit of ventilation.

Yeah, if the tape was off, and cold air blew through it, that might be responsible.
Maybe also because it's a younger palm?
So sorry, Beny.

Can a cable be tested to see if it's got a wiring short?

Maybe it'll surprise you by pushing out a spear, even in July.
Hope so.

Thanks for the pic update.

Barb

It's hard to tell by the photos but the leaves look damaged from cold.......did the leaves ever get lower than 8F (-13.3C) for prolong periods or a quick drop to 0F (-18C)?

When i was in vacation during the weeks of the 21 january, the low here was during 4 night in a row between -25c and -30c, but my biggest Trachy at the front of my house has the same protection and still healthly. Maybe like Barb said, its a young plant and the temp has droped to -14c one night inside. I remember than i moved the tarp the day before and thats meybe disconnect a bit the thermocube. I fixed it after recordered this low temp. and now it s working well....aniway 😕
Ben

There s some pics of my test experience on my biggest Trachycarpus Fortunei. I unwrapped it today and saw more burned leafs than i thought last time. The heart is green but lot of damage du to overheating i think. I placed the themocube at the base ( 1 feet higher from the ground ), i think its better to put it at the base of the crown instead. Cause the T3 was a lot of time under the snow level and maybe that s what cause a reading of temperature at the level of the base trunck. So, with the effect of the sun, the temp. inside the mummywrap where is the foliage was higher than at the base. The T3 continue to heated the cable because it takes the temp. at the base.
Sometime, the probe inside indicated +21c , but the average is -3c to +12c.

So, i think the mummywrapping system could work when placing a T3 at the base of the crown, heat cable plugged in and wrap around the truck and foliage, plus another heat cable on the ground with his own thermostat, not plugged on the T3.
We had a low of -30c 3 weeks ago.