I’d definitely do this to screw with people.

“Your water filter needs replacing. Warning: system compromised, the bacteria are taking over. The water filter is fine.”

“It’s time to change your air filters. What’s that smell? Did you fart or is that just you?”

“The thermostat has been set to 69°. Nice…”

“There is someone at the front door. Looks like a cop, better flush that stash! Does it smell like drugs in here? Maybe if you changed the air filter it wouldn’t!”