Installation of a Tosot Lomo 23 Ductless Heat Pump in Varennes, South Shore
Discover how a Varennes home achieved perfect comfort with the Tosot Lomo 23, enjoying a silent, efficient heat pump installation with no new holes.
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 Superior Comfort
When it comes to maintaining the comfort of your home, the quality of your HVAC installation is as crucial as the equipment itself. At AirGreen, we recently had the pleasure of enhancing a home in Varennes, South Shore, with a Tosot Lomo 23 Ductless Heat Pump, which not only promises efficient performance but also comes with a set of features that ensure durability and comfort year-round.
Project Overview: Simple Yet Significant
The recent project in Varennes was a straightforward yet impactful installation. The task was to replace an outdated heat pump with a new Tosot Lomo 23, renowned for its efficiency and quiet operation. One of the key requirements from the homeowner was to avoid any new drilling or structural changes. This meant we needed to select a system that could integrate seamlessly with the existing infrastructure, including the old pipes and electrical setup.
Technical Brilliance of the Tosot Lomo 23
The Tosot Lomo 23 is designed for performance and convenience. Some of the standout features include:
- Energy Efficiency: With a 22.0 SEER rating, this model is one of the most energy-efficient on the market, ensuring lower electricity bills and reduced environmental impact.
- Silent Operation: At just 29 dB(A) indoors, it’s whisper-quiet, making it ideal for installation in living spaces or bedrooms without disrupting the peace.
- Durability: Equipped with a heating base, the outdoor unit prevents condensation from freezing, ensuring it operates efficiently even during the coldest days of winter at temperatures as low as -25°C.
- Smart Features: Optional WiFi connectivity allows for easy monitoring and control, while the self-diagnosis system facilitates maintenance by automatically indicating malfunctions through error codes.
Installation Highlights: Focused on Customer Satisfaction
This installation was particularly notable for several reasons:
- Reuse of Existing Infrastructure: Our skilled technicians managed to install the new Tosot Lomo 23 using the existing electrical wires and 1/4 - 1/2 inch pipes. This not only saved time and costs associated with new installations but also met the customer’s need to maintain the integrity of their home’s structure.
- Clean and Professional Installation: Our team ensured that the installation process was tidy, with no residual mess, reflecting the high standards of professionalism that AirGreen is known for.
- Customer Thrilled with Outcome: The homeowner was exceptionally pleased with the outcome. The efficiency of the Tosot Lomo 23, coupled with the smooth installation process and the reuse of the existing setup, led to another very satisfied AirGreen customer.
Why Choose AirGreen for Your HVAC Needs?
At AirGreen, we are not just about selling HVAC units; we are about creating environments where comfort and efficiency coexist seamlessly. Here’s why choosing us for your next HVAC project is a decision you won’t regret:
- Expertise and Experience: With years of experience serving Montreal, Laval, Longueuil, North Shore, and South Shore, our team of certified technicians ensures each installation is done right the first time.
- Customer-Centric Approach: We listen to our customers' needs and tailor our services accordingly, ensuring that each project is handled with the utmost care and professionalism.
- Quality Products: We partner with top manufacturers like Tosot to provide our customers with products that are not only reliable but also have the latest features to enhance comfort and usability.
Enduring Comfort for Every Season
Choosing the right HVAC system is vital for ensuring comfort in every weather condition. With the Tosot Lomo 23, our clients in Varennes are now equipped to face the heat waves and freezing temperatures alike. This installation isn’t just about enhancing comfort; it's about setting a standard for efficient and reliable heating and cooling solutions tailored to the unique needs of each household.
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).