I suggest you consider the motion detectors instead. Both the coin and prepaid cards are a pain to maintain and basically look pig ugly. If you get a coin stuck then it has to be fixed straight away (even if its the middle of the night). The card meters are a little better, but you have to be available to supply them the next day. Also cutting the power to the units suddenly doesn't do them any good. Motion detectors send a normal stop signal to the unit if they think the room is empty for a set period. If one of the companies you tried to contact was Select Air Conditioning, I apologise, but I'm not taking on anymore work due to health reasons and have asked my details be deleted. Also Cool and Secure may have stopped trading.
I suggest you consider the motion detectors instead. Both the coin and prepaid cards are a pain to maintain and basically look pig ugly. If you get a coin stuck then it has to be fixed straight away (even if its the middle of the night). The card meters are a little better, but you have to be available to supply them the next day. Also cutting the power to the units suddenly doesn't do them any good. Motion detectors send a normal stop signal to the unit if they think the room is empty for a set period. If one of the companies you tried to contact was Select Air Conditioning, I apologise, but I'm not taking on anymore work due to health reasons and have asked my details be deleted. Also Cool and Secure may have stopped trading.