You air conditioner does not just cool your home/business, it also remove the humidity so as to maintain the comfort. It takes almost about 10 minutes for your air conditioner to reach it's peak efficiency. Once your air conditioner reaches peak efficiency, the dehumidifier starts working. Hence, if you use the air conditioenr for just 5 to 7 minutes, it wont work efficienctly. On top of that, by turning on and off your air conditioner, you might push your air conditioner too far based on the usage.