LG R32 Central Heat Pump | 3.5 Tons - 42,000 BTU

A 42,000 BTU central heat pump designed for real-life use in Montreal

A central system isn't just "a device in the yard" and "a box in the mechanical room." It's a whole system: sizing, ductwork, air returns, control, drainage, insulation, balancing, and commissioning. And that's precisely where most frustrations arise when a project is poorly designed.

In Greater Montreal, we see houses where:

• The air conditioning is strong on the ground floor, but the upper floor remains heavy and humid;

• The heating seems correct "on the thermostat", but some rooms remain uncomfortable;

• the system starts and stops too often, which puts strain on the components and increases noise;

• humidity accumulates in summer, especially during the sticky days of July and August;

• Incorrectly sized ducts create whistling noises at the grilles or a feeling of drafts.

A well-selected and properly installed central heat pump transforms these irritants into stable, discreet, and predictable comfort. The LG R32 Central Heat Pump | 3.5 Tonnes - 42,000 BTU addresses this type of situation: a modern central solution, using R-32 refrigerant , designed to offer a level of performance and control that makes a real difference in homes in Montreal , Laval , Longueuil , on the North Shore and the South Shore .

At AirGreen, our approach is not to “install a unit”: our approach is to deliver a coherent, sustainable, and comfortable central installation, taking into account the building and how it is inhabited.

Key specifications: what directly impacts comfort

When discussing a central system, some figures are more important than others. Here are the elements we consider immediately because they influence the final result:

• Nominal cooling capacity: 42,000 BTU
  This power output may be perfectly suitable for some buildings (and too high for others). The right decision depends on the actual load, not on habit.

• Size: 3.5 tonnes
  “Tonnage” is a simplification. What matters is the balance between the thermal load and the available airflow in your ducts.

• Refrigerant: R-32
  The R-32 is compatible with current systems, featuring a modern design and more precise controls. This isn't a marketing ploy; it's a feature that reflects a commitment to performance and technological advancements.

• Heating down to -16°C (advertised capacity)
  For Montreal and the surrounding area, low-temperature heating capacity is not a detail: it influences comfort during colder periods, and the frequency with which you switch to a backup system.

• Dehumidification: 7.9 pt/h (stated value)
  Dehumidification is too often underestimated. However, a house at 24°C and 60% humidity is much more uncomfortable than a house at 25°C and 45% humidity. In practice, the feeling of comfort in summer is as much a matter of humidity as it is of temperature.

• Noise level (indoors and outdoors)
  Noise is a recurring complaint when the installation is poorly planned (bad outdoor location, incorrectly set fan speed, restrictive ductwork). A professional approach aims to minimize noise "at the source" and in the distribution network.

• Power supply: 220V — MCA 32A — MOP 40A
  These values ​​influence the electrical aspects (rating, protection, compliance). A high-performing central system must also be properly installed, without compromising power supply or safety.

• Warranty (compressor / parts / labor): 10-10-0 years
  The warranty must be clearly understood. The value of a system is not measured solely by the purchase price; it is also measured by the peace of mind and the additional warranty options, if needed.

This data is useful, but it is never sufficient on its own. The difference always lies in the integration: ducts , air return , static pressure , drainage , commissioning , and balancing .

Central installation: the difference between “functioning” and “functioning well”

The classic pitfall: replacing “exactly” without validating the load

The most common scenario: a homeowner tells us, “I’ve had a 3.5-ton truck for 15 years, I want the same one.” Except the house has changed:

• windows replaced;

• insulation added to the attic;

• finished basement;

• floor expansion or modification;

• addition of teleworking (home offices heated/air-conditioned more often);

• change in occupational habits.

As a result, the load is no longer the same. And if you reinstall without checking, you often create a new problem:

• oversizing → short cycles, uneven comfort, less efficient dehumidification;

• Undersizing → system struggles, increased consumption, discomfort during peaks.

At AirGreen, we favour a decision based on the building, not on the outgoing device.

The ductwork network: the heart of comfort

A central heat pump can be excellent, but if the ductwork is problematic, the results will be mixed. Common issues in Montreal and the surrounding areas (Laval, Longueuil, North Shore, South Shore):

• compressed ducts in soffits;

• insufficient air return;

• parts located far from the source with pressure losses;

• “connections” improvised over the years;

• grids too small or poorly placed.

Our technicians systematically evaluate:

• the consistency of diameters and distribution;

• the presence of leaks;

• balancing the branches;

• the quality and accessibility of the filter;

• the possibility of improving air return.

An optimized central network enables:

• improved comfort on each floor;

• less noise;

• improved overall efficiency;

• more stable operation.

Static pressure (ESP): a technical term that explains many complaints

A landlord doesn't talk about "static pressure." He talks about:

• whistling at the gates;

• aggressive draft;

• noise in the ceiling;

• room that receives too little air;

• fan that seems to be "struggling".

These symptoms are often linked to an imbalance between fan power, system resistance, and actual airflow. Proper commissioning aims to respect system constraints and adjust ventilation for efficient and comfortable operation.

Drainage: a detail that prevents major problems

In air conditioning, condensation is normal. What should never be "normal" is a poorly designed drain. In a central system, the drain must be:

• correctly connected;

• inclined;

• secure;

• compatible with the unit's orientation;

• protected against blocking (depending on configuration).

A poorly installed drain can cause:

• infiltration;

• damage to gypsum;

• molds;

• avoidable service calls.

At AirGreen, we treat drainage as a critical point, just like the power supply.

The multi-position indoor unit: mechanical flexibility, better results

In residential settings, space and layout often dictate the design: low ceilings, narrow mechanical rooms, duct orientation, limited access. A multi-position indoor unit allows for adapting the installation without requiring compromises that negatively impact comfort.

In practice, this means:

• better alignment with the existing plenum when relevant;

• more logical routing of the piping;

• easier access for maintenance;

• Drainage is easier to secure.

This flexibility translates into less "tinkering", therefore greater long-term reliability.

R-32 in everyday use: what homeowners really notice

A landlord doesn't choose a refrigerant. He chooses an outcome:

• pleasant air conditioning, without a feeling of humidity;

• stable heating, without sudden variations;

• a reasonable noise level;

• controlled consumption.

With a modern central heat pump, the most noticeable improvements are often:

• better temperature consistency between rooms;

• a less “heavy” house in summer;

• a system that operates for longer periods with a payload rather than in short sequences;

• a more natural feeling of comfort.

AirGreen case studies: common scenarios around Montreal

Case 1 — Laval (North Shore): floor too hot in summer, living room too cold in winter

Single-family home with an old central heating system. The upstairs overheated in summer, especially in the late afternoon. In winter, the living room, being more exposed, remained less comfortable.

Our typical intervention:

1. Survey and diagnosis of the duct network (air return, restrictions, leaks).

2. Balancing adjustments: correction of over-favored branches and improvement of flow to weak areas.

3. Installation of a modern central heat pump adapted to the actual load.

4. Commissioning: validation of supply temperatures, drainage, and dehumidification behavior.

Result: significantly more uniform comfort, and a reduced feeling of humidity during the summer.

Case 2 — Longueuil (South Shore): whistling noise in the ducts and grates

In some buildings, noise is not the unit: it's the network. Undersized grilles, overly restrictive ducts, excessively high air velocities.

Our approach:

• recalibrate distribution and reduce restrictions;

• optimize speeds where necessary;

• check the balance between comfort, flow rate, and noise.

The desired result is not “total silence”, but a house where the system is forgotten.

Case 3 — Montreal: renovated house, former tonnage now inconsistent

After renovation (insulation, windows, layout), the old system was no longer suitable: short cycles and a feeling of air that was too “dry” in winter, persistent humidity in summer.

Our added value here is the same:

• sizing based on current reality;

• integration specific to the existing network, with corrections if necessary;

• neat adjustments.

Performance, efficiency and comfort: how to make the right decision

Understanding the clues (without getting lost in the numbers)

Efficiency indices (SEER2, HSPF2, EER2, COP) are useful, but they must be interpreted correctly. Two practical points:

• Theoretical efficiency does not compensate for inadequate installation;

• Air balancing and flow rate directly influence perceived performance.

At AirGreen, we explain these concepts in a concrete way: what will change in your home, on your bills, and in your comfort, depending on your situation.

Energy, but above all, well-managed comfort

In a house, the perception of comfort often depends on:

• temperature constancy;

• relative humidity;

• air circulation;

• the noise;

• air quality (air return and filtration).

A central heat pump is particularly attractive for homeowners who want to:

• consistent comfort;

• a centralized solution;

• a clean integration, without visible wall units in each room.

Maintenance and best practices: preserving performance year after year

A high-performing central system must remain high-performing. The points we consistently recommend are:

1) Filtration: simple, but essential

• Replace or clean the filter according to your usage (more often if you have pets, do work, or renovate).

• A saturated filter increases resistance, decreases airflow, and can make the system noisy.

2) Check the drainage before summer

• Simple prevention avoids surprises (odours, overflows, unwanted humidity).

3) Periodic cleaning and inspection

• Scheduled HVAC maintenance maintains heat exchange, reduces noise, and allows for early detection of problems.

4) Pay attention to “micro-changes” in the house

• Adding a door, closing off a space, insulating differently: all of this sometimes changes the airflow and the balance.

At AirGreen, we like our customers to understand these points, because it reduces unnecessary service calls and increases the lifespan of the system.

Why choose AirGreen for a central heat pump in Montreal, Laval, Longueuil and surrounding areas?

Many companies on the market can "install" the product. Few take the time to ensure a consistent installation. Our commitment is clear:

• On-site assessment : see the network, understand the house, avoid approximate decisions.

• Clear final offer : transparent pricing, no surprises.

• Experienced technicians : clean installation and serious commissioning.

• Payment at the end : you pay when you are satisfied with the result.

Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , our approach remains the same: to deliver stable, quiet, and lasting comfort.

Next Step

Are you considering an HVAC system with a high-performance central heat pump that's seamlessly integrated into your home? Contact AirGreen for an on-site estimate and a recommendation tailored to your ductwork, building, and occupancy needs. We'll guide you directly toward the best possible configuration, without compromising on quality.