Why do churches have Lightning Rodswhought?
You should just give them more time. It took awhile for my fathers cat to accept mine, but after sometime they watched over each other and occasionally cuddled. Has your cat been around other cats before this? It sounds like for now their cat is protective of home and yours is just not happy to have competition. Hopefully they will get passed it, but they may never be really close. This site may help you. Currently I am introducing my cats to my new kittens and its going slow but if you pet them both or have help petting/calming them down things will be easier because its love to both and shows the other is okay. ( Good luck!
If neither is a carbon Monoxide and they are both just smoke I have no clue. Maybe one is electric and the other is battery so they put the second as a back up in case the power was out? Or maybe if they are both hard wired there is a generator or some sort of back up power or maybe an alarm system one is wired into? Only things I can think of hope it helps. Tim
Are your keys in your pocket when the alarm goes off? Someone in the area could have an alarm with the same freq. causing your alarm to go off but that is not to likely. If the side view mirrors were pushed flat sometimes a thief will test your alarm on your car to see if it works and to see if the car is monitored since car alarms go off all the time and no one pays attention to them anymore.
