Louis Airy

On the ground, you see it every day. Every new project nibbles away a bit more space, while existing buildings wait for a second life. By betting on renovation, you meet demand, secure shorter timeframes, and add value to what already exists with concrete solutions: insulation, ventilation, efficient heating. It's also a strong argument with project owners. Less ground footprint, more usability, and a project that's more locally acceptable.

5 min read

Your clients want shade in summer without giving up garden space. Adding solar panels to a lightweight structure near the house creates a pleasant outdoor living area and an electricity output that shows up on the bill right away. What remains is to secure the siting, waterproofing and grid connection for a clean, profitable job.

5 min read

Radiant ceilings have no unified installation code. The plasterboard electric version is governed by a CSTB technical prescriptions guide, and the hydraulic version by a technical approval issued system by system. The figures that bind you are therefore in those documents, not in a general standard, and they look nothing like underfloor heating figures. Here they are, and here is when the ceiling genuinely beats the floor.

5 min read

The path to 2050 is also decided on your job sites. Between insulation, heating, ventilation and control, you can turn a "standard" renovation into a genuine, measurable gain, without complicating the project for the client. The challenge is choosing the right work packages, in the right order, to durably cut emissions and bills.

5 min read

When your clients switch to wood heating, they want something concrete from you. With reverse combustion, the gain comes down to two things you control. Wood quality and air adjustment. By setting these parameters right from installation, you secure a high efficiency and cleaner flue gas, without vague promises.

4 min read

At your clients' homes, a wood-fired cooking appliance can do double duty. It's a real plus when they want steady heat, a simple backup in case of a power cut, and daily use without multiplying equipment. With the right installation and safety habits, you turn a 'practical' request into a clean, durable, value-adding job.

4 min read

On a job site, a few well-placed signs quickly head off neighbours' complaints, and above all trouble in the event of an inspection or accident. As a tradesperson, it's in your interest to organise visible information as soon as you arrive on site, to secure access, prevent risks and display what's legally required. It's simple to set up, and it saves you time, not the other way round.

5 min read

When the temperature drops, defrosting becomes the little pause that can make a client uneasy. As a tradesperson, you have everything to gain by simply explaining what's happening, when it's normal, and how to limit the loss of comfort and efficiency. With the right settings and a careful installation, winter stays a season of results, not surprises.

5 min read

In a T1 studio, every square metre counts. As a tradesperson, you can gain comfort without sacrificing space, by combining well-targeted insulation, controlled ventilation and compact equipment, from correctly sizing the heat pump to a smart tank. With a clear method and suitable choices, you deliver a result that performs, lasts, and is easy to explain to the client.

5 min read

Between monobloc and bibloc, it is not efficiency that decides but the job itself: a monobloc puts water outdoors and spares you any work on the refrigerant circuit, a bibloc keeps the water inside but requires refrigerant handling credentials and a properly executed refrigerant install. The rest, frost, acoustics, maintenance access, is recorded on the technical visit and written into the quote.

5 min read

On the ground, a good pellet heating appliance often comes down to three simple points: the right output, a well-thought-out air intake, and maintenance planned ahead to avoid callbacks. By asking the right questions right from the quote (actual demand, flue constraints, bag storage), you secure the customer's comfort and your margin, without spending your evenings on it. Let's sort through it together, step by step, to choose confidently based on the home and how you install.

5 min read

No text ranks scroll above rotary, and no standardised data compares the two technologies against each other. What can be compared is the seasonal space heating efficiency under EU Regulation 813/2013, the declared sound power level, and the refrigerant charge, which on its own decides your checking obligations. Here is what you record, what you write on the quote, and what carries your liability.

5 min read

On site, you're looking for insulation that holds up without piling on precautions. A bio-based material in granules or panels can simplify installation, especially for interior lining, under screed, or for acoustic correction. The goal is simple: consistent performance, sound moisture management, and a durable result, without the headaches.

5 min read

In winter, your clients don't judge a renovation by the thickness of the insulation, but by what they feel room by room. As a tradesperson, you can secure the result by relying on a few simple adjustments, even before talking about the work itself, to gain usable heat and limit cold spots. That means a more legible job for the client, and reviews that feel good to read.

5 min read

A micro-storage combi is not compared on a flow rate quoted in litres per minute, it is compared on the load profile declared under Regulation (EU) No 814/2013 and the reference energy Qref that goes with it, from 2.100 kWh for an S profile to 5.845 kWh for an M profile. And the temperature setpoint is not a free choice: the French order of 30 November 2005 imposes a floor of 50 °C at every point of the distribution. Here is how to size on figures rather than on an impression of comfort.

5 min read

A gas boiler pilot light is not a trimming detail, it is a permanent load that the French 3CL-DPE 2021 method puts at between 100 and 240 W depending on the type and age of the appliance. Running continuously, that comes to 880 to 2,100 kWh NCV a year, before the first call for heat. Here are the default figures you can stand behind, the meter-reading method, and the NCV/GCV conversion that stops you being out by a factor of 1.11 between the data plate and the bill.

6 min read

The pressure of a sealed circuit is set cold, from the water column height of the building, then checked hot to validate the expansion vessel. That check is one of the mandatory service points on a heat pump connected to a water loop. This article gives the setpoint table by height, the cold-to-hot reading and the diagnostic tree for a drifting gauge.

5 min read

On a job, heat is often the item that weighs heaviest in the carbon footprint. When a neighbourhood is supplied by a network, your role is to check what's actually behind the substation and steer the client towards the right settings, at the right time. Wood energy, heat recovery, geothermal, gas top-up — the mix is evolving fast and it's changing how you size, balance, and control an installation. By understanding the sources used and their constraints, you secure performance and gain credibility when questions about decarbonisation come up.

5 min read

Past a certain scope, pairing a facade renovation with external insulation stops being a commercial opportunity and becomes a duty. Article R. 173-4 of the French construction and housing code treats a renovation touching at least 50% of a wall, excluding openings, as major works, and that classification forces you to insulate. Here is the threshold, the exemptions, and the two thermal resistances that do not say the same thing.

5 min read

When the job site switches into winter mode, your installation can quickly fail you at the worst moment, and that's where you save time by planning ahead. Between antifreeze protection and a condensate pan heater, the idea is simple: secure the drainage and avoid failures that cost you another callout. By choosing the right solution and taking care with installation, you deliver a reliable system, even when temperatures drop.

5 min read

When a client complains about a room that stays muggy despite the installation, it's often a sizing issue. With a few simple measurements and two or three good field habits, you can quote the right capacity, avoid overspending, and secure comfort in summer as well as mid-season. That saves time at the quote stage, and lets you sleep easy after commissioning.

5 min read

On a job, summer comfort often comes down to a single detail of placement. A well-sized roof overhang blocks high summer sun, limits overheating behind windows, and helps you keep your comfort promises without overloading the heating budget. In renovation, it's a protection that's simple to explain to the client, quick to price, and compatible with insulation and joinery. Well thought out, it improves in-use performance and saves you the "it's too hot" call-back the first summer.

6 min read

Sizing a communal solar DHW installation does not start from the available roof but from the hot water volume consumed in the leanest month. The SOCOL 2021 sheet sets the store volume on that minimum monthly consumption, then derives the collector area through a ratio running from 40 to 100 litres per square metre depending on the third of the country concerned.

5 min read

Before starting a renovation, you have everything to gain by checking the state of the wastewater treatment system on site. A well-run inspection avoids bad surprises during earthworks, connections or a sale, and lets you quote accurately from the outset. By clarifying non-compliance points from the start, you protect your schedule and your client relationship.

5 min read

A ground floor over a crawl space is treated from underneath, against the retrofit U-value Approved Document L expects. What decides the price is the clear height under the joists, the state of the substrate and the ventilation of the void, all recorded during the survey. Here are the thicknesses per insulant family, the feasibility conditions to write into the quote and the points that carry your liability.

5 min read

When a client hesitates between heating and insulation, it's often the right moment to propose a winning duo. By combining a properly sized heat pump with external wall insulation, you secure comfort, reduce heat demand, and avoid an oversized unit that disappoints in use. With the right site method, you turn a vague request into a clear, costed, reassuring plan.

5 min read

When the goal is fast, stable hot water with no tank, installation quality makes all the difference. As a tradesperson, you control the points that prevent temperature swings and callbacks: real flow rate, pressure drop, scaling, settings. Here we go straight to practice, so you can size accurately and install cleanly on the first visit.

5 min read

When a heat pump runs year-round, well-executed maintenance avoids silly breakdowns, secures performance, and protects your reputation on site. Between regulatory obligations, leak checks, and useful adjustments, it's well worth setting up a simple routine and tracking it properly. That saves time and leaves less room for callbacks.

5 min read

On site, only an actual measurement settles whether a wall is holding up or dragging down the whole work package. A heat flux meter gives you that figure without dismantling anything, provided you hold to the ISO 9869-1 protocol: 72 hours minimum in stable conditions, more than 7 days otherwise, and convergence within 5 % before quoting a number.

6 min read

When you size insulation or a heat pump, a small coefficient can tip the result. Applied correctly, it helps you estimate heat loss more accurately based on contact with the outside, and avoid job sites that end up under-heated or oversized. In practice, it's a simple benchmark to keep your calculations and quotes reliable, without getting lost in theory.

5 min read