Installation of a Tosot Lomo 23 Wall-Mounted Heat Pump in Sainte-Julie
Upgrade to silent, efficient heating and cooling with the Tosot Lomo 23. See why our customers trust AirGreen for their HVAC needs!
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
A Seamless Transition to Efficient Heating and Cooling
The Challenge of the Old and The Triumph of the New
In the tranquil suburb of Sainte-Julie on Montreal’s South Shore, the need for a reliable and efficient heating and cooling solution is as variable as the Canadian seasons. This narrative begins with a local homeowner plagued by an aging heat pump that had become a source of constant noise and frequent repairs. Every year brought a new challenge, disrupting the comfort of his home and straining his patience and wallet. The old unit, noisy and unreliable, made it clear that a change was overdue.
Choosing the Tosot Lomo 23: A Decision Made Easy
The decision to upgrade wasn’t just about replacing old with new; it was about transforming how our client experienced home comfort. Enter the Tosot Lomo 23, a sleek, wall-mounted heat pump known for its quiet operation and impressive efficiency. This model wasn't chosen on a whim. The homeowner had witnessed firsthand the performance of a Tosot heat pump installed at a friend’s home. Impressed by its silent operation and durability, the choice became obvious. With a cooling and heating capacity of 9,000 BTU and an efficiency rating of 23.0 SEER, the Lomo 23 stood out as the perfect balance of quality, price, and performance.
The Installation: Simplicity and Savings Hand in Hand
What made this installation particularly smooth was the compatibility of the new unit with the existing infrastructure. The 1/4 - 3/8 pipes and electrical wiring from the old system were a perfect match for the new Tosot model. This not only simplified the installation process but also brought about significant cost savings, which we passed directly to our client through our referral discount and a special discount for reusing the existing fittings.
Our team of certified technicians, known for their meticulous attention to detail, ensured that the installation was executed flawlessly. They leveraged their expertise to integrate the new system seamlessly, enhancing the overall efficiency and reducing potential future maintenance needs.
Advanced Features for Modern Living
The Tosot Lomo 23 is not just about heating and cooling. It embodies a suite of modern features designed to enhance user experience and operational efficiency:
- Energy Star® Certification: Guarantees energy savings and helps reduce utility bills.
- Optional WiFi Control: Offers convenience by allowing temperature adjustments from a smartphone or tablet.
- Smart Defrost: Ensures the heat pump operates efficiently through intelligent defrost cycles based on real-time weather conditions.
- Self-Diagnosis: Simplifies troubleshooting by automatically indicating maintenance checks and error notifications.
Silent Operation, Guaranteed Comfort
One of the standout features of the Lomo 23 is its incredibly low sound pressure levels. At just 29 dB(A) indoors, it is quieter than a whispered conversation, ensuring that home comfort comes with peace and quiet. This low noise level is pivotal for families seeking a serene home environment.
Ready for the Canadian Weather
The Lomo 23’s capability to operate effectively even in extreme temperatures is critical for our Canadian climate. With a heating capacity maintained up to -25°C and equipped with GREE’s two-stage Inverter technology, it ensures continuous comfort, be it during a heatwave or a freezing cold snap.
Long-Term Reliability and Support
Understanding the importance of long-term commitments, the Tosot Lomo 23 comes with a comprehensive warranty package: 10 years for the compressor, 10 years for parts, and an optional extended warranty for labor. This warranty underscores our confidence in the reliability and performance of the products we install.
Why Choose AirGreen?
At AirGreen, your comfort is our priority. Our team is dedicated to providing not only the highest quality installations but also impeccable customer service. Our success is measured by the satisfaction of our clients and their trust in us to enhance their living spaces.
Your Comfort, Our Commitment – Experience the difference with AirGreen.
The big day, step by step
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What would it look like at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Every house has its constraints. We see them before we install.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).