| What to clean | Vents, ducts, evaporator coil, blower |
| When | Before you switch to cooling for summer |
| How often (full cleaning) | every 3 to 5 years |
| Time on site | 3 to 5 hours for most homes |
| DIY-able? | Vents yes, ducts and coil no |
| Price | Free quote |
Key takeaways
- The evaporator coil sits upstream of your ducts and collects moisture by design. Dust sticks to that damp surface all winter, and the first cooling cycle pushes it into every room.
- NADCA includes coils, drain pan, blower and ducts in a proper system cleaning. Skipping any component can recontaminate the whole system.
- NRCan says AC units become inefficient when the inside coil is dirty. Cleaning the full system before summer restores airflow and cooling output.
- On average, a residential duct cleaning removes 47 lbs of mold, dust, and debris per home, and homeowners see a 26% drop in energy use after duct cleaning.
The vent cover is what people notice first. It gets dusty, they wipe it down, the problem looks handled. But an AC system has three layers: the vent covers you can reach, the ductwork behind the walls that carries cooled air to each room, and the indoor unit where the evaporator coil and blower actually cool and move the air. All three collect dust, and in Metro Vancouver’s damp coastal climate the coil collects moisture on top of that. Indoor air quality depends on every part of the system, and cleaning before summer means cleaning all three layers.
What collects inside your AC system over winter
Your HVAC system recirculates indoor air 5 to 7 times per day. Every cycle moves dust, pet dander and cooking particles through the ductwork, and some of it settles on duct walls, the blower assembly and the evaporator coil.
The coil is the worst collector. It pulls moisture out of the air during cooling, and that wet surface traps particles the way a damp cloth picks up flour. Even if the AC did not run much last summer, the coil stays exposed to air movement whenever the furnace runs through winter. On the coast, humidity stays high enough that organic matter on the coil and in the ducts can develop a musty smell well before summer arrives.
Three parts to clean before summer
1. Vents and registers
This is the part you can handle yourself. Pull the register off the wall or floor, soak it in warm soapy water, wipe the slats and vacuum the first few inches of duct behind the opening. That removes surface dust and pet hair from the grille.
What it does not reach: anything past the first few inches of duct, the trunk line, the blower compartment or the coil. If the vent covers keep getting dusty within days of wiping them, the source is deeper in the system.
2. The ductwork
Every supply and return duct in the house carries air to and from the indoor unit. Dust, pollen, pet dander and construction debris settle along the runs over time. A professional duct cleaning uses HEPA-filtered negative-air vacuuming and compressed-air tools to dislodge and extract that buildup through the entire system.
The common guideline is a full cleaning every 3 to 5 years for a typical home. Pets, smokers, renovations and the damp BC coast all push that interval shorter.
3. The indoor unit: evaporator coil and blower
This is the part that makes the biggest difference for cooling performance. NRCan says air conditioners “become inefficient when the inside coil is dirty, when the airways on the outdoor condenser unit are blocked and when the refrigerant level runs low.” Two of those three are cleaning problems.
A dirty evaporator coil restricts airflow through the system. The blower has to work harder, energy consumption goes up and cool air reaching your rooms drops. NADCA recommends cleaning the full system together: air ducts, coils, drain pan, registers, grilles, air plenum, blower motor and assembly, heat exchanger, air filter and air cleaner. The reason: failure to clean all components of the system can result in recontamination of the entire system.
Pro tip: Before calling for a cleaning, pull a floor register and shine your phone flashlight into the duct. If you see matted dust past the first few inches, the buildup runs through the whole system, and the coil sitting upstream is almost certainly dirty too.
Signs your AC system needs cleaning
1. Dust returns to the vent covers within days
You wipe the registers and they look the same a week later. That dust is blowing out from inside the ductwork each time the system runs.
2. Musty or stale smell when the cooling turns on
The first time the AC runs after months of sitting idle, you smell it. Organic matter on the coil and in the ducts has been sitting in damp conditions all winter.
3. Weak airflow from the registers
A coated coil or buildup in the ducts reduces the volume of air the blower can push through. If the system used to cool the house by mid-afternoon and now runs all day, restricted airflow is a likely cause.
4. Allergy symptoms that ease when you leave the house
If sneezing and congestion improve outdoors and return indoors, the HVAC system is circulating allergens through every register. Pet dander, dust mites and mould spores travel the duct network with every cycle.
Heads-up: Running AC through a dirty evaporator coil reduces cooling output and creates a moisture problem. The damp surface feeds mould growth, and the blower pushes those spores through the ductwork into every room.
How AirCare cleans the system
We clean the full system using source removal: HEPA-filtered negative-air vacuuming with compressed-air agitation to dislodge dust stuck to duct walls, coil surfaces and the blower assembly. Every supply and return duct, the trunk line, the blower compartment and the evaporator coil are included.
On average, a residential cleaning removes 47 lbs of mold, dust, and debris per home. That material is spread across every component.
Before closing the system, we invite you to view the final cleaning of the main trunk. The technician does a final visual check, secures all access points and reviews the completed service with you.
If mould is present, we follow the cleaning with Benefect Decon 30, a Health Canada approved, plant-based disinfectant used in hospital and clinic work.
Between full cleanings
NRCan recommends changing or cleaning your furnace filter every 3 months. Keep the outdoor condenser unit clear of plants and leaves. These steps slow buildup but do not reach the ductwork and coil surfaces where the real accumulation sits.
Get a quote
Get a free quote. A few questions about your home, then we send your quote by text and email. AirCare Systems BC is NADCA certified, with $5M liability insurance and 100+ Google reviews at a 5.0 rating.
Where we do this work
AirCare Systems BC cleans residential ductwork and AC systems across Metro Vancouver and the Fraser Valley: Vancouver, North Vancouver, West Vancouver, Burnaby, Richmond, Surrey, Coquitlam, Port Coquitlam, Port Moody, New Westminster, Delta, Langley, White Rock, Maple Ridge, Pitt Meadows and Abbotsford.
