Can a heat pump really cut a Swiss heating bill by half? Swissthermic SA makes that claim outright, promising reductions of up to 50 percent when it pulls an old oil or gas boiler and installs an air-to-water heat pump in its place. The firm works across Suisse Romande, the French-speaking cantons, and puts the switch to both homeowners and commercial property owners tired of feeding an ageing furnace every winter.

The registry backs up the basics. Moneyhouse lists Swissthermic SA under the number CHE-309.590.756, based in La Conversion near Pully in canton Vaud, and it records a recent change in the company's management. So Swissthermic SA is a real, registered Swiss business with a paper trail, not a landing page with a quote form bolted on.

What the company is selling, stripped of the marketing, is a fuel switch: off oil or gas, onto electricity through a heat pump sized to the building.

Swapping oil and gas for a heat pump

The core service is heating-system replacement, and Swissthermic SA splits its site cleanly into Residential and Commercial, with About Us and Contact sections framing the two. The company says every installation is designed for the specific building instead of dropped in from a template, which is the correct approach, because heat pump sizing is unforgiving and an undersized unit in a poorly insulated house is a cold, expensive mistake.

The technical promises are specific enough to hold Swissthermic SA to later. Reliable operation down to minus 15 degrees answers the obvious Swiss winter worry, and the headline is that up-to-50-percent cut in heating bills. That top figure invites a raised eyebrow, and I suspect it leans on the very worst old oil systems to reach the top of its range. The claim is at least concrete, which is more useful than a vague promise to save money.

The split between Residential and Commercial is more than a menu label. A house and a small commercial building pose different problems, hot-water demand, the roof or wall space for the outdoor unit, the electrical supply already on hand, and the firm pitches to both without pretending a single solution covers them. For an owner weighing an oil-to-heat-pump conversion, that distinction is the first thing worth clarifying on the free call, because the sizing math shifts with the building.

Scale is part of the reassurance. Swissthermic SA puts the number of properties it has upgraded above 1,000 and describes its installers as Swiss-certified and licensed, the credentials that count when the work involves refrigerant, electrical connections, and a hole cut in the side of a house.

The free diagnostic and quote

Every path on the site funnels toward one thing: a free diagnostic. Swissthermic SA offers a no-cost consultation and quote as its main call-to-action, and that is the sensible way to sell something this bespoke, since no honest installer can price a heat pump without first seeing the building, the existing system, and the insulation.

A visitor who wants a firm number has to book that diagnostic. There is no instant online estimate or configurator, which is fair given the complexity but worth knowing ahead of time, since the free consultation is the only door in.

Guides on Vaillant and Viessmann units

The blog is more than filler. Swissthermic SA runs guides on specific hardware, including Vaillant aroTHERM heat pumps and Viessmann air-to-water models, alongside a general primer on heat pumps written for the Suisse Romande market. Naming the brands it installs is a small mark of confidence; a firm that will write up the Vaillant aroTHERM by name expects to be asked technical questions about it. The material appears in both English and French, in step with a site that runs in both languages throughout, and it widens the audience past native French speakers to the region's large expatriate population.

Subsidy help is the piece that turns a good idea into an affordable one. Swissthermic SA says it will guide clients through claiming government subsidies, the cantonal and federal grants that make a heat pump conversion pencil out in the first place. Those grants are real money, often several thousand francs, and missing the paperwork window is a common way homeowners leave it on the table, so handing the installer the job of steering that process removes a genuine headache. For someone staring down the forms, that hand-holding is worth nearly as much as the installation itself.

Ratings, registry, and reaching them

Reputation is where Swissthermic SA looks strongest on paper. The site displays a Trustindex-certified score of 4.9 out of 5, drawn from Google reviews, and elsewhere shows an "Excellent" rating across 103 reviews. Trustindex's own review page for Swissthermic SA cites more than 93 satisfied customers and the same 4.9-star figure, so the number is at least mirrored off the company's own pages rather than living only on them. Multiple five-star Google reviews are quoted across the site and blog, along with a Qwoted profile for the company's director, Javier Lopez, that draws praise for professionalism, efficiency, and responsiveness.

The Lopez profile is a useful detail on its own. A named director with a public profile is easier to hold accountable than an anonymous brand, and it lines up with the management change the registry records. None of it replaces an independent audit of the work, but it is more transparency than a regional installer usually bothers to offer.

A fair caveat sits underneath all of that. No independent Trustpilot, Yelp, BBB, or business directory profile turned up in a search, so the glowing picture rests almost entirely on Google reviews and the Trustindex badge that packages them. That is common for a regional installer and hardly damning, but a buyer who likes to cross-check a score across several platforms will find just the one well to draw from here. Anyone wanting more certainty could ask Swissthermic SA for references from recent installs in their own commune.

Contact is lean but functional. A phone number sits in the header of every page, next to a Contact nav item and the free-diagnostic button, so reaching a human takes a single tap. What the fetched pages do not surface is a street address or an email, a slight gap for a firm that sends technicians into people's homes, even though the registry pins Swissthermic SA to La Conversion. The diagnostic form and the phone line carry the whole load of getting in touch.

Swissthermic SA lays out a coherent case for anyone in Vaud or Geneva weighing an oil-to-heat-pump conversion: a registered Vaud company, certified installers, subsidy guidance, and a stack of Google reviews behind a 4.9 badge. The thing to press on is that 50 percent figure and what it quietly assumes about the boiler being replaced. The site runs in English and French, the phone number stays in the header on every page, and the street address stays off it.

---