Why it pays to be cautious when hiring a heat pump installer
A heat pump is one of the most important comfort upgrades you can make to a New Zealand home, especially with our cold, damp winters and hot summer afternoons in many parts of the country. But because installation quality affects efficiency, noise, warranty cover and safety, choosing the right installer matters as much as choosing the right unit.
A dodgy or unreliable tradesperson can leave you with:
- a system that is too small, too loud or badly positioned
- water leaks, poor drainage or condensation issues
- higher power bills because the unit is inefficient
- warranty claims that are difficult to prove
- electrical or building compliance problems
- unexpected extra charges once the job has started
The good news is that many warning signs are visible before you commit. If you know what to look for, you can avoid most of the common traps.
Red flag 1: They only want cash, or strongly push cash-only payment
A request for cash is not automatically a scam, but cash-only behaviour is a serious warning sign if it comes with reluctance to provide paperwork or receipts.
Be cautious if a tradesperson:
- says they can only do the job if you pay cash
- refuses card, bank transfer or invoicing
- offers a much lower price for cash with no paperwork
- won’t provide a GST invoice or receipt
Why this matters in NZ:
- You should have a clear paper trail if there is a dispute, warranty issue or insurance claim.
- A legitimate business can usually issue an invoice and explain payment terms.
- If the installer disappears or the work is substandard, you may struggle to prove what was agreed.
A better approach is to pay by traceable method and keep every document, including the written quote, invoice, product details and any email or text messages.
Red flag 2: No written quote, or only a vague text message price
A proper written quote is one of the easiest ways to separate a professional installer from someone who may be improvising.
Watch out for quotes that:
- are given only verbally
- are just a figure in a text message with no detail
- do not say what model is being supplied
- omit installation scope, labour, materials or warranty information
- do not explain what is excluded
A good heat pump quote should normally spell out:
- the make and model of the indoor and outdoor units
- capacity, such as 2.5 kW, 5.0 kW or 7.1 kW, and why it suits the room
- what electrical work is included
- pipework length limits and any extra metre charges
- wall bracket, pad, drain, trunking and insulation details
- removal and disposal of the old unit, if applicable
- whether the price includes GST
- expected timeline and any site-specific conditions
Without a written quote, you have little protection if the installer later claims “that wasn’t included”.
Red flag 3: They demand a large upfront deposit
Some deposit is normal for a supply-and-install job, particularly if equipment needs to be ordered. But a large upfront payment can be a warning sign if it is not clearly justified.
Be careful if they ask for:
- most or all of the total price before work starts
- an unusually large “booking fee” with no written terms
- immediate payment to “secure the deal”
- payment before they will provide the unit details or quote
In New Zealand, legitimate tradespeople often ask for a deposit, but the amount should be reasonable and clearly stated in writing. For smaller residential jobs, a deposit is usually only part of the total, not the whole job.
Practical rule: don’t pay more than you’re comfortable potentially chasing, and never pay a large amount without a signed quote or contract that lists exactly what you are buying.
Red flag 4: No physical address, no company details, or only a mobile number
A real business should be easy to identify and contact after the installation. If all you get is a first name and a mobile number, that’s a problem.
Warning signs include:
- no street address on the quote or invoice
- no company name or NZBN details
- no website, business email or landline
- reluctance to say where they are based
- a mailbox-only setup with no verifiable trading history
Why this matters:
- You need to know where to send any complaint, warranty claim or formal notice.
- If a fault appears later, you want an installer who can be traced.
- A business address also helps you confirm whether they are a real, established operator in your region.
It’s worth checking whether the business has a proper online presence, local references and an invoice with full contact details.
Red flag 5: They pressure you to decide immediately
Pressure tactics are a common hallmark of unreliable tradespeople. A good installer understands that homeowners usually want time to compare quotes and think through the options.
Be suspicious if they:
- say the price is only valid “today” with no genuine reason
- claim another customer is about to take the slot unless you pay now
- discourage you from getting multiple quotes
- tell you the job is simple when they haven’t inspected the site
- push you to choose a specific brand without explaining why
A proper installer should be happy for you to compare options. For most homes, getting at least two or three written quotes is sensible, especially if the install is complex, involves multiple rooms, or requires electrical upgrades.
Red flag 6: They avoid discussing licences, credentials or who is actually doing the work
Heat pump installation can involve electrical work, refrigerant handling and sometimes building-related work such as mounting, penetrations or structural fixing. In New Zealand, some parts of the job are regulated.
Be alert if the installer:
- won’t say whether they are an electrician, a heat pump specialist or a subcontractor
- gets vague when you ask about qualifications
- cannot show proof of relevant authorisation
- says credentials “don’t matter”
Key NZ points to check:
- Electrical work is regulated by the EWRB, and a suitably authorised person should carry out or supervise the work as required.
- Refrigerant handling should be done by someone appropriately trained and authorised.
- Plumbing, gasfitting and drainlaying are separate restricted work areas under the PGDB, though they are not usually the main issue for a standard split-system heat pump.
- If the work involves building alterations, structural changes or major external alterations, council consent may be needed depending on the scope.
Ask who will physically do the install, what trade they belong to, and whether the work will come with the relevant compliance paperwork where required.
Red flag 7: They downplay compliance documents or can’t explain them
A reliable installer should be able to explain what paperwork you will receive and why it matters.
Be careful if they say things like:
- “You don’t need any paperwork for this.”
- “Compliance is just paperwork; it doesn’t matter.”
- “We never give that out.”
Depending on the job, you may need documentation such as:
- a detailed invoice and written warranty information
- electrical compliance documentation where applicable
- product manuals and maintenance instructions
- council-related documentation if consent was required
This is especially important if you sell the house later or need to prove the installation was done correctly. Missing documents can become a headache for both you and a future buyer.
Red flag 8: They won’t inspect the site before quoting properly
A heat pump install is not always a simple “standard install”. The final price can change depending on access, wall type, drain path, switchboard capacity, ceiling space and the distance between indoor and outdoor units.
If someone gives you a firm price without asking basic questions or checking the site, be cautious.
A proper site assessment should usually consider:
- room size and layout
- insulation and sun exposure
- where the outdoor unit can go without causing noise issues
- how condensate will drain
- whether there is enough electrical capacity
- whether access requires scaffolding, ladder work or awkward routing
Skipping the inspection often leads to surprise extras later, which is where dodgy operators can start charging for “unexpected” items.
Red flag 9: The quote hides extra charges in the fine print
Some installers offer a low headline price to win the job, then add costs once you’re committed.
Common hidden extras include:
- extra pipe metre charges
- electrical upgrades not mentioned upfront
- disposal fees
- travel charges
- wall bracket or pad fees
- “difficult access” add-ons
- after-hours surcharges
Always ask what is included and what may cost more. If the quote is vague, ask for a revised one that lists common extras and the rate for each.
Red flag 10: Bad communication and pushy sales behaviour
How a tradesperson communicates before the job usually tells you a lot about how they will behave during it.
Unreliable installers often:
- reply late or not at all
- avoid answering direct questions
- change the price or scope repeatedly
- speak dismissively when you ask for clarity
- try to rush you into signing
A professional should be responsive, clear and willing to explain technical points in plain English. If they are rude, evasive or aggressive before they have your business, they are unlikely to become easier to deal with afterwards.
A quick comparison: professional vs risky behaviour
| What you want to see | Red flag to watch for |
|---|---|
| Written quote with full scope | Verbal-only price or vague text message |
| Business name, address and invoice details | Only a mobile number or no fixed address |
| Reasonable deposit terms in writing | Large upfront payment demand |
| Clear explanation of electrical and compliance requirements | “Don’t worry about the paperwork” |
| Time to compare quotes | Pressure to decide immediately |
| Site visit or proper assessment | Price given without checking access or layout |
| GST invoice and payment trail | Cash-only with no receipt |
How to protect yourself before you sign
The best defence against a poor installer is a careful hiring process. Before you accept a quote, do the following:
- get at least two or three written quotes
- check the business name, address and NZ contact details
- ask who will do the install and whether they are appropriately qualified
- confirm whether the price includes GST
- ask what happens if the job needs extra electrical work or building work
- request product model numbers and warranty details in writing
- make sure the quote explains deposits, payment stages and cancellation terms
- keep screenshots, emails and messages in one file
It’s also smart to ask for references or recent local jobs, especially if the installer is offering a significantly cheaper price than others. In the current NZ market, bargain pricing can be tempting, but unusually low quotes sometimes mean corners will be cut on labour, materials or compliance.
When to walk away
Trust your instincts. If several warning signs appear together — for example, cash-only payment, no written quote, pressure to sign immediately and no physical address — it is usually best to walk away.
A heat pump is a long-term purchase. Saving a few hundred dollars upfront is not worth the risk of poor performance, safety issues, expensive call-backs or warranty disputes later.
A reliable installer should make you feel informed, not cornered. If the process feels rushed, secretive or confusing, that is often the clearest red flag of all.
Final thought
The safest heat pump install is usually not the cheapest one on the day. It’s the one backed by a proper written quote, clear credentials, traceable business details and straightforward communication. Take the time to compare quotes, ask awkward questions and check the paperwork before you commit — your home, wallet and winter comfort will thank you.
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