So giving some thought to Mike’s post, I have set up an indoor/outdoor thermometer to get a bit of an idea regarding how long it will take to achieve equilibrium once the observatory is open.
Currently at 8:50pm indoor temperature is 17.2 and outside temperature is 16.8, a different of 0.8. Of course this is just the first of many results and I will of course repeat the process of cooling the observatory over the next week and months see if there is a trend.
My future plan is to add a Wireless Temperature/Humidity Weather Station like this one from Jaycar.
https://www.jaycar.com.au/temperatur...ation/p/XC0412
Cheers.