Pierre-Louis Guhur

On a renovation job, acoustic comfort often comes down to a detail your clients notice right away. Good separation between rooms also depends on choosing the right door set and careful installation, gaps, seals, threshold and frame included. By mastering the expected levels and checkpoints, you avoid callbacks and add value to your work from day one.

5 min read

When a system starts heating "on its own", those are kWh going out the door that nobody asked for. In renovation, the right check valve in the right place helps you block this parasitic circulation, protect comfort, and prevent heat feeding back between circuits. A few simple checks secure commissioning and cut down on callbacks.

5 min read

After a job, real relief comes from being able to prove everything holds up. With a thermal imaging camera, you can spot thermal bridges, airtightness defects or poorly installed insulation in a few minutes, before the customer discovers them the first winter. That secures your handover, your end-of-job photos and your reputation.

5 min read

Between shifting subsidies, quotes to compare and works to sequence, your clients often ask you the same questions. With a few clear answers ready to go, you save time, set the framework, and avoid misunderstandings before the visit even happens. It's a simple way to protect your projects and build trust.

5 min read

When water is very hard, boilers take more punishment than expected. A simple upstream adjustment can limit scale build-up, stabilise efficiency and cut down on breakdowns that always happen at the worst time. As a tradesperson, you get a more reliable installation and clients who notice the difference over time.

5 min read

When a job "loses heat," your customers feel it right away on their bill... but not always to the naked eye. With an infrared camera survey, you can spot heat-leaking zones in a few minutes, and prioritise the right fixes. The result: a clear diagnosis, better-targeted work, and fewer discussions at the end of a job.

5 min read

On site, the choice of material for distributing heat can either save you hours or cost you them. Steel, copper or PEX each have their own installation habits, points of caution, and contexts where they become the best fit. By clarifying the home's constraints and your installation practices, you secure a clean, durable result that's easy to maintain.

5 min read

Between two renovation solutions, the real gap is often decided over 15 or 20 years, not on this month's quote. With the right discount rate, you bring future energy, maintenance and replacement costs back to today's value, and you finally compare on equal terms. That's how you defend a solid technical choice, backed by clear figures.

6 min read

When summer heats up, your clients want to stay cool without blowing the budget or installing air conditioning everywhere. By first relying on simple, well-installed solutions, solar protection, managing heat gains, night ventilation, you gain comfort from the first hot days and add value to your job. And if air conditioning eventually becomes useful, it comes in as reinforcement, not a patch.

5 min read

On a job site, what matters is knowing when the investment actually starts paying off. Between insulation, heating and ventilation, you need a simple method to quantify the savings, factor in subsidies and set clear assumptions over 10 or 15 years. With a rigorous approach, you protect your quotes and can talk budget with your clients without ambiguity.

5 min read

In a timber-frame house, everything happens fast. Solar gains climb sharply, then the temperature drops as soon as the sky clouds over or night falls. As a tradesperson, you can smooth out these swings with simple choices in design, materials, and settings, without adding weight to the job.

5 min read

When you redo a bathroom or a heating network, the choice of tube changes everything. You want a material that bends quickly, connects cleanly and limits callbacks. With the right fittings and careful installation, you save time, and your client gains reliability, without blowing the budget.

5 min read

On a job site, a lot is decided in what you don't see right away. The right 'mass' in a wall or a floor can smooth out heat spikes, limit heating jolts, and improve comfort without complicating the installation. As a tradesperson, you get to choose where to place it, and above all, when it becomes a real gain rather than a constraint.

5 min read

When your clients complain about one room being too hot and another too cold, you can take back control without redoing the whole installation. With an adjustable, programmable radiator head, you fine-tune room by room, at the right times, and turn "all or nothing" heating into managed comfort. The result is a cleaner job and added value that's easy to explain.

5 min read

On a job site, every choice matters, not just for energy, but also for the wildlife around the building. You can easily earn points with concrete gestures: preserving the soil, limiting unnecessary lighting, planning simple refuges on facades or roofs. The result: a more pleasant building, and a client who sees the difference right away.

5 min read

When your clients want to cut their bill without changing all their habits, the electricity-gas duo often ticks the right boxes. You keep stable comfort, you adapt output to cold days, and you offer a solution that works well in renovation, even when the home isn't ready for 100% electric. A way to move forward without setbacks or bad surprises at start-up.

5 min read

In renovation, the junctions between walls, floors, and window openings often make the difference between a "clean" job and one that comes back to haunt you six months later. By getting these details right from the site visit onward and coordinating them across your trades (insulation, airtightness, finishes), you secure performance, comfort, and above all your own peace of mind. Here we go straight to the point — the checks to run and the mistakes that cost dearly.

5 min read

In renovation, every kilo counts. When a screed isn't an option or ceiling heights are tight, a lightweight solution saves time and limits rework, without sacrificing floor comfort. It's up to you to run a cleaner, faster job that's compatible with many substrates, to keep your schedule and reassure the customer from the first site visit.

6 min read

The degree-hour is the degree day brought down to the hour, and the conversion is a single multiplication by 24. What matters is what you do next: crossed with the building's loss coefficient G, it gives the annual heating need in kWh, and therefore the substance of a savings argument. Here is the conversion, the full calculation chain, and the two errors that derail it.

6 min read

On site, your clients want something concrete. They expect a quick jump in comfort and a lower bill, without multiplying job sites or delays. By combining a heat pump with good insulation, you offer the easiest duo to sell, and often the most effective one, when the diagnosis is done right.

5 min read

An extract-air heat pump water heater is the best credited of its family in the French EPC, on one condition that is rarely checked on the technical visit: that the ventilation supplies it with enough continuous air flow. The minima of the decree of 24 March 1982 are often below what the machine asks for. Here is the calculation to run before you specify.

5 min read

Between a commercial kitchen and a home kitchen, it is not the order of magnitude that changes, it is the text that applies. In housing, one order sets a rate per room. In catering, nothing sets a rate for the hood: the figure comes from the county health regulation, and employment law only sets a floor per occupant.

5 min read

On a hygro B mechanical ventilation system, a well-adjusted extract vent isn't enough if fresh air doesn't enter in the right place. As a tradesperson, you can secure the airflow, limit discomfort and avoid callbacks, just by taking care with the choice, placement and installation of air inlets. A few job-site details often make all the difference, without adding complexity.

5 min read

A humidity-controlled extract vent is not chosen on a catalogue modulation range but on two regulatory figures: the peak flow rate the room has to reach, and the floor that modulation allows you to hold. The French order of 24 March 1982 sets both, and the BAR-TH-127 sheet adds the conditions that have to be met for the installation to count towards energy-saving certificates.

5 min read

Between photos, plans, customer exchanges and team tracking, your job-site information often ends up scattered everywhere. With the right tools, you centralise everything in one place, avoid oversights and save time without weighing down your day. The result: faster decisions, clear evidence, and projects that move forward cleanly.

5 min read

On a house, siting is not a detail. It can add comfort in winter and avoid overheating in summer, without adding a single piece of equipment. As a tradesperson, you have influence from the earliest sketches or during a major renovation to place living rooms and glazing where they work for you, not against you. A few simple choices, well explained to the client, and your project becomes more efficient, easier to read, and often easier to justify when applying for grants.

6 min read

When you optimise a building's envelope, its shape matters as much as its materials. A well-designed volume limits heat-loss surfaces, simplifies insulation, and helps you meet the Approved Document L targets without over-engineering the job site. In practice, it's a concrete lever for gaining performance, budget, and peace of mind, right from the sketch stage.

5 min read

On a job near the sea, salt and humidity attack fast. On a facade, a roof or a terrace, the smallest weakness becomes an entry point, and callbacks pile up. As a tradesperson, you save time when you secure materials, fixings and finishes from the start. With the right reflexes, you deliver a durable result, and you avoid site returns.

5 min read

On site, you already see it: jobs are split between maintaining existing networks and securing new uses. For you, as a tradesperson, the challenge is simple: knowing where tomorrow's demand will come from, and how to adapt your offer without spreading yourself too thin. Between renovation, more targeted connections and hybrid solutions, there are opportunities to seize — provided you read the trajectory before everyone else.

5 min read

A water heater's energy class means nothing on its own: it only makes sense alongside the declared load profile, because the scale changes with every profile. The same 40 % efficiency earns class A in profile XS and class C in profile M. Here are the two tables from Regulation 812/2013, the floor that ecodesign has imposed since 2017, and where to check a product's declared figure.

6 min read