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AC service · Methods

Foam cleaning vs jet pump: which is better for split AC coils?

A jet pump wash pushes water through the coil and can clean heavy dirt, but it needs water, a bag or sheet, more time and care not to bend fins or wet electricals. Foam cleaning with Aerosure AC Foam Cleaner works into the fins with little or no water and less mess, which suits routine indoor services in occupied rooms.

By · Reviewed by the InnovaChem technical team · Updated

Foam
Little or no water, less mess
Jet pump
Heavy dirt, more water
Fins
Low pressure only
Best
Foam for routine, jet for heavy

Side by side

Foam cleaning vs jet pump
Foam cleaning (Aerosure AC Foam Cleaner)Jet pump wash
Water neededLittle or none, as per labelSeveral litres per unit
Mess in the roomLowNeeds a bag or sheet, risk of wet walls
Time per unitShortLonger: set-up, wash, clean-up
Depth of cleanFoam expands into the finsGood on heavy dirt if pressure is right
Risk to fins and electricalsLow; keep foam off electricalsHigh pressure can bend fins and wet electricals

Using both

Many technicians foam clean routine services and keep the jet pump for heavily soiled units. Even then, foam first loosens the dirt so the rinse can be gentler.

Products used

Quick answers

Is foam cleaning as good as a jet pump wash?

For routine services, foam cleaning reaches into the fins with little water and mess. For very heavily soiled coils, many technicians foam first and then rinse gently.

Is foam cleaning enough for a very dirty coil?

For heavy dirt, foam first to loosen it, then rinse gently. A jet pump can follow on badly clogged coils if fins are protected and electricals are covered.

Which method uses less water?

Foam cleaning needs only a light rinse, so it uses far less water and mess than a jet pump wash, which also needs a bag or sheet to catch the runoff.

Sources

  1. US Department of Energy, Energy Saver: Air conditioner maintenance

Related on InnovaChem

AC service guidesHow to clean a split AC coil with foam: 4-step SOPWhy is my split AC not cooling? A technician’s checklistAC service checklist for technicians (printable)How to clean an AC condenser coil (outdoor unit)How to find an AC gas leak before rechargingHygiene glossary

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AC maintenance numbers to know

Published guidance for room ACs. Follow the AC maker’s manual and the product label.
WhatTypical range
Clean or replace filtersEvery 1 to 2 months in the cooling season, sooner in dust [source]
Energy saved by a clean filter5% to 15% less energy than with a clogged filter [source]
Check the indoor (evaporator) coilEvery 12 months; clean when dirty [source]
Drain lineClear it at each service so water cannot back up [source]
Star labelCompare models by BEE star rating and ISEER [source]

What are the signs an AC needs a service?

  • Weak or uneven airflow from the indoor unit.
  • A musty or sour smell when the AC starts.
  • Water dripping from the indoor unit or a full drain tray.
  • Ice on the indoor coil or the copper pipes.
  • The AC runs longer to reach the set temperature, or bills go up.
  • New rattles, hissing or buzzing from either unit.

What should be in your service kit?

  • Gloves and eye protection
  • Coil foam cleaner and a spray bottle of clean water for rinsing
  • Soft brush or vacuum for loose dust
  • Fin comb for bent fins
  • Drain bag or sheet to catch runoff
  • Wire or blower to clear the drain line
  • Torch, screwdriver set and a way to confirm the power is isolated

Carry the product SDS on your phone and follow the AC maker’s manual for the unit you are servicing.

Standards and references

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