Recommended intervals

  • Residential — every 12 months, or every 6 months if the unit runs most of the year.
  • Offices and retail — every 6 months.
  • Restaurants and kitchens — every 3 to 4 months, because grease-laden air fouls coils quickly.
  • Industrial and dusty sites — quarterly, with condenser cleaning as the priority.

What a proper service includes

Filter cleaning is the visible part. The work that actually protects the unit is coil cleaning, drain clearing, checking refrigerant pressures and superheat, measuring the temperature difference across the coil, verifying electrical connections and current draw, and logging the readings so drift can be spotted next time.

Why it pays

A fouled condenser makes the compressor work harder for less cooling, which shows up on your electricity bill long before the unit fails. Most catastrophic failures we attend were preventable with one service visit.