I have a strange question/theory that I'd like some advice on.
I currently have a garden shed that is being used as a home office. On sunny days, the inside of the shed gets very hot - too hot for me to be comfortable - about 30C. Outside temperature would be around 22-23C during these times.
My understanding is that the inside of the shed is getting heated by radiation - both from the small perspex window as well as the wooden walls/roof (the walls and roof are insulated with thin PIR insulation and plasterboard. This only has limited insulation capability as the frame of the shed is only 20mm thick so I couldn't fit any thicker celotex.)
Now, I have installed a single-hose portable air conditioning unit inside the shed, with its hose fed outside through a hole that's been drilled. This unit does work, but at 30C inside (with the unit set to 25C), it does struggle to bring the temp down.
Due to the single hose nature of the unit, this creates a negative pressure differential causing outside air to come inside. Normally, this is why single-hose units are deemed "bad" and inefficient. However in my case, as the outside air is significantly cooler than inside the shed, and I'm only setting the unit to 25C, does opening the door actually help with efficiency in my case? From a very brief and quick non-scientific experiment, the shed does seem to cool down faster....
Am I on to something here? I'm running the unit on solar power to efficiency does matter.
If the answer is "yes", then my next question is: Is is more efficient than a simple fan extractor installed at the opposite end of the door (instead of the air conditioning unit)?
Thanks for your help