Yes, we cleaned up the text just a bit. FilterWatch has precision temperature sensors that allow us to watch the starting air temperature each time you change your filter. If this temperature is changing consistently in the wrong direction, its likely you have a refrigerant leak. Similarly, if the starting air speed is changing consistently slower, your coils are clogged. Don't forget, if we can reach a $10,000 goal, we also add a humidity sensor. This will help us detect high humidity in basements or even clogged drain pipes.