Cleaning a MultiZone heat pump in Rosemont–La Petite-Patrie

Complete maintenance of an outdoor unit installed on a balcony in Montreal

At AirGreen , we were recently called upon to perform a thorough cleaning of a MultiZone heat pump installed on a narrow balcony of a residential building in the Rosemont–La Petite-Patrie neighbourhood of Montreal. This type of installation, typical of apartment buildings in the city, presents particular challenges: limited space, restricted air circulation, and rapid accumulation of dust and urban pollutants.

Diagnosis: loss of efficiency and partially obstructed fins

The client contacted us after noticing a decrease in air conditioning performance and an increase in noise from the outdoor fan . During our initial inspection, we observed that:

• The interchange fins were covered with a thin film of dust and urban pollution;

• The side ventilation openings were partially obstructed by plant debris blown by the wind;

• The refrigeration piping was exposed to temperature variations, which had slightly damaged the insulation.

These combined factors reduced the heat pump's ability to efficiently transfer heat, forcing the compressor to work harder and increasing energy consumption.

Intervention: a meticulous cleaning adapted to the constraints of a Montreal balcony

The AirGreen team carried out a complete cleaning of the outdoor module , while respecting safety standards and the specific characteristics of a confined workspace:

1. Power off and secure the area , protecting the walls and the guardrail.

2. Low flow suction to remove dust without dispersing particles in the vicinity.

3. Application of a biodegradable cleaner to the fins and heat exchange surfaces.

4. Low pressure rinsing with a controlled jet, to avoid any water seepage towards the electrical components.

5. Manual cleaning of the side grilles and the fan , removing pollen and grease residue.

6. Checking the condition of the refrigeration cables and partially replacing damaged insulation .

7. Complete functional test to ensure proper compressor start-up and return of optimal airflow.

The intervention was carried out in compliance with the safety guidelines for balcony installations, an essential aspect for this type of equipment often located near inhabited spaces.

Results: optimized performance and restored comfort

Upon restarting, the MultiZone heat pump demonstrated an immediate reduction in noise and improved heat exchange . The customer noticed that the indoor temperature stabilized more quickly and that daily electricity consumption decreased significantly.

Measurements taken by our technicians confirmed a performance gain of nearly 25% , a sign of a system free from any obstruction.

The importance of preventative cleaning of MultiZone heat pumps

Multi-zone systems, capable of supplying several indoor units from a single outdoor compressor, require rigorous maintenance. A single blockage or a clogged heat exchanger can affect the entire system. At AirGreen, we recommend:

• A complete wash at least once a year before the summer season;

• A visual inspection every three months to check the condition of the fins and drains;

• The use of acid-free cleaning products to preserve the finish and durability of metal surfaces.

AirGreen Expertise: Safety, Performance and Sustainability

Working in a dense urban environment like Rosemont–La Petite-Patrie requires experience and precision. Our technicians use specialized, low-water-emission tools , allowing for effective cleaning even in confined spaces. Each service call is accompanied by a detailed maintenance report , ensuring traceability and performance monitoring of the client's HVAC system.

In summary

• Location: Rosemont–La Petite-Patrie, Montreal

• Equipment: Multi-Zone heat pump (outdoor unit on balcony)

• Problems: Clogged fins, increased noise, loss of efficiency

• Actions performed: Vacuuming, eco-friendly washing, gentle rinsing, checking of refrigeration insulation

• Result: Restored energy efficiency, reduced noise, optimized interior comfort

Thanks to this intervention, the MultiZone heat pump has regained all its original efficiency and silence, ensuring the owner lasting and energy-efficient comfort for the seasons to come.