Greenhouse inside a greenhouse for ultratropicals?

I believe it is going to work for something that would fruit at a small measurement.  I’ve my greenhouse set at 55F in winter and have had a purple mangosteen seedling rising for years (verrry slowly, but it surely appears wholesome sufficient).   I overlook what qualifies as extremely tropicals.  I’ve a marang and pedalai in floor that look glad.  Chempedak appears advantageous to date however I simply put it within the floor.  I can not get rambutan seedlings to even survive greater than a pair months, however I believe its the soil combine not the local weather.   Durian appeared glad then consistently will get attacked by spider mites.  Rollinia and Soursop in floor are pleased with the local weather and flowering however need to develop massive and in addition consistently beneath spider mite assault.    Abiu in a container is tremendous wholesome and flowering.  Kepel seeds die as quickly as they sprout.  Pulasan dies as quickly because it sprouts. 

So far as backups, I haev some propane tank handbook heaters, sufficient to outlive a number of days with out energy.  And I’m pondering of getting a photo voltaic panel array for emergency cooling in case there’s a summer time storm that knocks out energy adopted by a scorching sunny day.   The most important difficulty is rapidly detecting an outage and responding to it.  I have not discovered an affordable thermometer that makes use of mobile for alerts, solely wifi, radio, and textual content message stuff that is not dependable

In case you are on the lookout for a cooling resolution evaporative cooling works wonders when you’ve got a clear water suppply. 

Simply observed your photograph, that look nice and fairly effectively insulated.  Can it tolerate excessive humidity with out affecting the encompassing construction?  In that case I might simply chew the bullet and switch the thermostat up and have the entire thing be “extremely tropical greenhouse”