Depending on filter type a typical 1" filter should last between 1 to 3 months.

A well maintained and properly installed system should last 10 to 15 years.

An AC vent sweats when the temperature of the grill reaches dew point. If this is happening in your home there is usually a high humidity problem or an outdoor air intrusion. Sweating AC vents and ducts could cause damage to your home.

The reason for an ac system running all day can equate to many problems: low refrigerant, dirty condenser or evaporator coils, improper installed system, low attic insulation, or undersized equipment. A hvac system running all day can cause high utility bills. It is recommended that a technician does a thorough inspection to find the root of the problem.

An ac freezing up could be low refrigerant, dirty filter, dirty evaporator coil, or lack of air flow. It is recommended to turn the system off and turn the fan ON on your thermostat and call a technician. This will help the ice thaw so it can be properly evaluated.