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I used to leave my scope near the garage door under semi cover, but as soon as i went and dragged it out in the open, the ambient temp sensor dropped 2 or 3 degrees. Your house will retain/radiate heat
i think you need that temp logger, I know tassie is more extreme, but the temps will seem to settle after midnight and then 3-5am, there seems to be another drop sometimes.
Every time I have watched bird ie at the two camps, the temps move after midnight, and he stops and waits.
I still like your images.
PS When I was in melbourne, Ian and I walked into D!ck Smith and looked at those 12 volt fridges that sell for $15 - $30. They are a peltier design. I bought it and pulled it apart.
Bird was very impressed with the tooling of it and seeing a peltier by itself was $11 and a fans and heatsink add up to way more than $30, they look great.
I have bird old system he kindly donated and am getting a local aluminium engineering shop to cut up some 2mm thick templates for the 10 GSO dobs.
I believe that baby bird setup may come in at less than $150 including a dual temp sensor.
I am testing on a 7 amphour batery as I am only using 1 peltier and 1 big fan and 3 little fans.
I will keep you updated. I hope to have finished in next coupla weeks, prior to opposition
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