Karin,
Has your Municipality considered a false fire alarm bylaw? We have been using this to try and reduce the number of call outs for nuisance alarms. Under certain circumstances the owner of the property may end up being billed at MTO (per apparatus) rates after so many calls that have “no reasonable cause”. The CFO would also have the option to allow the money to be spent instead to make alterations to reduce the risk of a false fire alarm.
In this case we would probably require the replacement of the smoke detector with a heat detector after the 2nd call, or the owner risks paying for the manpower and apparatus to attend.
Regardless, it is something to consider depending on your circumstances.