Installation of a Tosot Lomo 23 Wall-Mounted Heat Pump in Mercier–Hochelaga-Maisonneuve, Montreal
See how we transformed a Montreal home with the Tosot Lomo 23, ensuring silent, efficient heating and cooling with a sleek, invisible setup.
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.
Transforming Spaces with Innovative HVAC Solutions
At AirGreen, we're dedicated to providing high-quality HVAC services throughout Montreal, Laval, Longueuil, North Shore, and South Shore. Our recent installation of the Tosot Lomo 23 Wall-Mounted Heat Pump in Mercier–Hochelaga-Maisonneuve showcases our commitment to excellence and client satisfaction. This article delves into the nuances of this specific project, highlighting the unique challenges we overcame and the impressive features of the Lomo 23.
Project Overview: Seamless Integration for Maximum Comfort
Our latest project involved a strategic installation of the Tosot Lomo 23, a model renowned for its efficiency and discreet design. The client desired the indoor unit to be positioned at the beginning of a small hallway, aiming for optimized airflow into the living room. This placement required a clever routing of pipes and electrical wiring through the kitchen, ensuring that all components were concealed within the walls to maintain the home’s aesthetic integrity.
Technical Excellence and Aesthetic Harmony
Challenges Overcome:
- Innovative Installation: The primary challenge was the intricate routing of the unit’s components. Our skilled technicians devised a plan to snake the necessary pipes and wires through the kitchen without disrupting its functionality or appearance.
- Custom Finishes: Post-installation, a professional plasterer was brought in to seamlessly integrate the unit into the existing wall, applying gyprock and a color-matched coat of paint. This attention to detail ensured that the installation was not only functional but also visually appealing.
Key Features of the Tosot Lomo 23:
- Energy Efficiency: With a 22.0 SEER rating and Energy Star® certification, the Lomo 23 is a paragon of energy efficiency, significantly reducing energy costs while maintaining optimal comfort.
- Advanced Technology: The unit features GREE's two-stage Inverter technology, which provides up to 80% heating capacity even at -25°C, ensuring performance during Montreal’s harsh winters.
- Smart Features: Optional WiFi connectivity allows for remote management of settings, enhancing user convenience. The model also includes a microprocessor-controlled smart defrost system that operates only when necessary, maximizing energy efficiency.
- Quiet Operation: Ensuring a peaceful home environment, the Lomo 23 operates at low sound pressure levels (29 / 45 dB(A) internally), making it one of the quietest in its class.
- Durability and Warranty: The Tosot Lomo 23 comes with an impressive 10-year warranty for compressor, parts, and labor, reflecting its robust design and build quality.
Client Testimonial: Beyond Satisfaction
Our client expressed immense satisfaction with the installation process and the performance of the Lomo 23. The meticulous approach to hiding all installation traces in the kitchen and the flawless finish provided by our plasterer were particularly appreciated. Furthermore, the client was impressed by the heat pump’s quiet operation and effective heating capabilities, which ensured their comfort during both the peak of summer and the depths of winter.
Why Choose AirGreen for Your HVAC Needs?
- Expertise and Precision: Our team comprises highly skilled professionals who are adept at handling any HVAC challenge, ensuring that every installation is executed flawlessly.
- Customer-Centric Approach: We prioritize our customers' needs and preferences, ensuring that every aspect of our service is tailored to provide maximum comfort and satisfaction.
- Quality and Innovation: We use only the best products and the latest technologies in the industry, guaranteeing that our installations are not only effective but also innovative and long-lasting.
Conclusion: Ensuring Comfort in Every Season
Choosing AirGreen means opting for an HVAC service provider that values quality, efficiency, and customer satisfaction above all. Our installation of the Tosot Lomo 23 in Mercier–Hochelaga-Maisonneuve is a testament to our commitment to providing superior heating and cooling solutions that are both efficient and aesthetically pleasing.
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.
The on-site estimate is free and the quote follows within 24 hours.
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).