Straight answer: only hire an installer who holds valid F-gas (gases fluorados) / APA certification, invoices you with VAT (factura c/ IVA), and puts the workmanship warranty in writing. Skip any of those and a cheap quote becomes an expensive mistake. This guide gives expats the full checklist, the red flags to walk away from, and the paperwork to demand — then you can get an honest, certified quote free in 24h.
Written by the local team behind AC Rental Lisbon — years of keeping Lisbon homes and apartments comfortable, and of vetting the installers who do the work.
You've just moved to Portugal, summer hits, and you ask around for AC. Back come three numbers that barely agree — one suspiciously cheap "cash job", one padded quote in Portuguese you can't fully read, and one that seems fair but you've no way to judge. The problem isn't you: most installers hide the price and skip the paperwork, so a newcomer can't tell a certified professional from a weekend fitter. The good news is that a good installer in Portugal always leaves the same three fingerprints — certification, a VAT invoice, and a written warranty. Learn to check those and the choice gets simple. Prefer the numbers first? Our AC installation cost guide lays out the real 2026 ranges.
Run any quote through this list before you sign. A trustworthy installer answers every point without flinching and puts it all in writing. If you'd rather not do the vetting yourself, we've already done it — every installer we arrange meets all six, so you can skip straight to the free quote.
Get your free quoteIf a quote sets off any of these, treat it as a warning — not a bargain.
The classic. A cheaper "sem factura" deal means no VAT invoice, no warranty, no recourse — and a voided manufacturer guarantee.
Dodging the F-gas question, or claiming it "isn't needed for a small unit", means the person may not be legally allowed near the gas.
A number with no written breakdown that quietly grows on the day — extras for piping, brackets and access appear only once the van arrives.
Pressure to pay everything before any work, with no contract and no written warranty, leaves you with zero leverage if it goes wrong.
None of these are about being unfriendly — a fair installer is happy to answer every one. It's about protecting a purchase you'll live with for a decade.
In Portugal the paperwork isn't bureaucracy — it's your protection. A factura c/ IVA is a legal VAT invoice tying the company to the work; a written warranty keeps them on the hook if the install leaks or fails. Without both, a "cheap" job is uninsured and unaccountable. This is exactly why we bundle certified labour, VAT invoicing and a workmanship warranty into every quote — see how the process works on our installation guide, and what upkeep costs on our maintenance page.
Get your free quoteYou experience one brand and one point of contact. Behind it, the physical work is carried out by a certified F-gas / APA partner who invoices with VAT and provides the warranty. You never have to run the checklist yourself.
Area, number of rooms and your timing — about a minute in the form. That's all we need to start.
We size the right system for your rooms and send an honest, itemised quote within one working day.
A vetted F-gas certified installer fits it cleanly, invoices with VAT and hands you the warranty in writing.
You're fully guaranteed. Need a service or a question later? You're one message away from the same team.
The single best defence against a padded quote is knowing the real ranges. These are indicative installed prices (unit + fitting) for Greater Lisbon in 2026 — anything wildly outside them deserves a question. Full detail on our cost guide and Portuguese pricing page.
Annual maintenance (clean + gas check): ~€60–180 per unit. Prices are indicative guide ranges, not a quote.
Each extra indoor unit adds equipment and labour — the single biggest driver of price.
Beyond the standard ~3 m, extra copper piping is charged per metre — it should be itemised, not hidden.
Your own balcony is cheap; a high façade needing scaffolding or a shared roof costs more.
Daikin/Mitsubishi sit at the top; Gree/Haier are more affordable for the same room.
If piping and holes already exist, installation can be 30–50% cheaper — a fair quote reflects that.
In Alfama, Baixa & Chiado, outdoor units on the façade may be restricted — see our historic-building guide.
Wherever you've landed — the historic centre, the coast or across the river — we match you with a certified, insured installer who works the way this guide describes.
If you rent, live in a protected historic building where an outdoor unit isn't permitted, or only need cooling for the summer, no installer — however good — is the right answer. Our sister company AC Rental Lisbon delivers portable air conditioning across Lisbon — same-day, no installation, no drilling.
By law, anyone handling refrigerant gas in Portugal must hold F-gas (gases fluorados) certification, and the company must be registered with APA (Agência Portuguesa do Ambiente). Ask for the certificate number and the name of the certified technician before you book. A genuine installer will share it without hesitation; anyone who dodges the question or says "it's not needed for a small unit" is a red flag. Every installation we arrange is carried out by a certified, insured technician.
Three things: a written, itemised quote before the work; a proper VAT invoice (factura c/ IVA) after it, with the company's NIF on it; and a written workmanship warranty on the installation, separate from the manufacturer's warranty on the unit. If someone offers a cheaper "cash, no invoice" price, walk away — no invoice means no warranty, no legal recourse and a voided manufacturer guarantee.
The classics: no F-gas certificate, no VAT invoice, a verbal-only price that changes on the day, pressure to pay the full amount in cash up front, a "from" price that never mentions your building, and no written warranty. A vague quote that doesn't list the unit model, the BTU rating and the standard pipe run is another warning sign — you can't compare what isn't written down.
No. In AC, the cheapest headline number is often the most expensive job you can buy. An uncertified fit risks refrigerant leaks, fines, and a manufacturer warranty that's void the moment something breaks. Compare like-for-like: the same BTU rating, a certified technician, a VAT invoice and a written warranty. A fair, transparent quote that includes all of that usually beats a mystery "bargain" within a year.
Two or three is plenty. More than that and you're mostly comparing sales patter, not substance. Make sure each quote lists the same things — unit model and BTU, certified labour, standard pipe run, VAT and warranty — so you're comparing the real job. If one quote is dramatically cheaper, it's usually leaving something out that appears as an "extra" later.
Know the real ranges before you ask: a single-split is installed from about €550 and a whole-home multi-split runs roughly €1,500–4,500, so anything wildly outside that deserves questions. Insist on a written quote and a VAT invoice in a language you understand, and work with someone who answers in English and puts everything in writing. We quote transparently in English and Português precisely so newcomers can tell a fair price from a padded one.
Got a quote in Portuguese you can't read, or a "from" price that feels off? Message us and we'll give you a straight, no-jargon second opinion — and a certified quote of our own if you want one. We usually reply within minutes on WhatsApp, in English or Português.
Now you know what to look for, let us do the vetting. An honest, itemised quote from an F-gas certified installer, within one working day. Free, no obligation. Start on the AC Installation Lisbon homepage.