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CVC Commercial à Laval : Entretien Préventif d’un Système ThermoPlus dans un Immeuble Multilocataire
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Commercial HVAC in Laval: Preventive Maintenance of a ThermoPlus System in a Multi-Tenant Building

Optimize the performance and reliability of a ThermoPlus HVAC system through rigorous preventative maintenance

At AirGreen , we recently performed comprehensive preventative maintenance on a ThermoPlus system installed in a multi-tenant office building in Laval . This equipment, used for centralized heating and cooling , plays a key role in occupant comfort and the building's energy management. Our mandate was to ensure the system's continued operation while improving its efficiency and durability.

Site context and objectives

The building in question houses several businesses across four floors. Each floor is served by a centralized ventilation and heat pump system, controlled by a building management system ( BMS ). The owner wished to:

  • Preventing seasonal breakdowns during periods of high demand (summer/winter)

  • Optimize energy performance and reduce electricity consumption

  • Improving indoor air quality (IAQ) for occupants

  • Ensure compliance with current ASHRAE and CSA standards

Initial diagnosis and technical surveys

Before any intervention, our specialized technicians carried out:

  • A complete visual inspection of the ThermoPlus unit and its hydronic and electrical connections

  • Airflow and temperature measurements at the duct outlets

  • Monitoring of refrigerant level , differential pressure , and condensate drain operation

  • A check of the main filter (visibly clogged, as observed on site)

  • An acoustic survey to detect any abnormal vibrations

The results showed a slight loss of thermal efficiency (≈ 12%), attributable to fouling of the filter and evaporator coil , as well as an approximate calibration of the ambient temperature sensor .

Technical solution implemented

Our AirGreen experts have implemented a comprehensive preventative maintenance procedure , respecting the standards of the manufacturer ThermoPlus and best practices in the commercial HVAC sector:

Main steps:

  1. Safe shutdown and lockout of the power supply

  2. Remove and clean the main filter using a certified HVAC neutral detergent

  3. Cleaning of the evaporation coil with controlled rinsing and residue recovery

  4. Inspection and purging of the condensate drain to remove any obstructions

  5. Checking hydronic connections (no leaks, correct pressures)

  6. Calibration of the thermostat and temperature sensors connected to the BMS

  7. Analysis of post-intervention energy efficiency using an anemometer and a digital wattmeter

Constraints and coordination

The intervention was scheduled outside of office hours to avoid any disruption to the comfort of the occupants.
The mechanical space, located in a technical room in the ceiling , presented access constraints requiring the use of a CSA-certified lightweight scaffold. Coordination with the building maintenance department and the BMS manager ensured a smooth execution.

Results and Key Performance Indicators (KPIs)

Following the procedure:

  • Energy efficiency gain : +14% on the overall system efficiency

  • Noise level reduction : -3 dB after turbine cleaning

  • Improved IAQ : 30% drop in PM2.5 particle levels

  • Reduction in blowing temperature of 2.4 °C (indicating optimal heat exchange)

  • No building management system alarms were recorded during the 30 days following the maintenance.

These results demonstrate the direct impact of professional preventive maintenance on the performance, reliability and longevity of HVAC equipment .

Compliance, safety and sustainability

AirGreen ensures that each intervention complies with:

  • ASHRAE standards 62.1 and 90.1 (air quality and energy efficiency)

  • Quebec building codes applicable to hydronic systems

  • CSA Z460 Electrical Safety and Lockout Protocols

  • The requirements of the EnerGuide and Hydro-Québec program for energy efficiency

The customer also received a full maintenance report , including photos, technical readings, and recommendations for the next 12 months (MERV-13 filter replacement and turbine belt inspection).

Continuous maintenance and monitoring of building management systems (BMS)

A quarterly maintenance contract has been established, including:

  • Complete inspection of filters and drains

  • Biannual battery cleaning

  • Annual check of probes and control wiring

  • Priority access to our 24/7 emergency service

  • Integration of the ThermoPlus system with our AirGreen BMS remote monitoring platform for predictive monitoring

This proactive maintenance model helps reduce unplanned downtime , extend equipment lifespan , and maximize return on investment (ROI) for the building manager.

ROI, subsidies and outlook

Thanks to the observed reduction in electricity consumption and the optimization of system performance, the client is now eligible for the EcoPerformance subsidy program of Transition énergétique Québec.
The projected energy savings represent an estimated annual saving of $1,150 , for a return on investment of less than 18 months .

Conclusion

This ThermoPlus maintenance in Laval perfectly illustrates the importance of structured and compliant preventive maintenance in the commercial HVAC sector.
At AirGreen , we combine technical expertise, operational rigor and a personalized approach to guarantee the continuous performance of HVAC systems in Montreal, Laval, Longueuil, as well as on the North Shore and the South Shore.

AirGreen — Experts in the maintenance, design and modernization of commercial HVAC systems in Greater Montreal.