lorraine

Keycards are a good option and not overally expensive, they can be retro fitted in older building but this is a bit more expensive and messy, it is usual to have this fitted on new builds, it can be done to a different circuit to ensure that all other appliances remain.

I have often wondered if a timer could be fitted to aircon units so they only run for an hour at a time. maybe there is a member on this forum who is electrically techy minded? This would certainly solve all problems, I am sure that it could be done.