The Quote Audit: Five Questions Sutton Homeowners and Small Firms Should Ask

A quote is not just a price. It is a plan for how the unit will be sized, where the pipes will run, how the water will leave, how noisy it will be and who will pick up the phone if something goes wrong. In Sutton, we see plenty of quotes that look tidy on one page but leave out the awkward details. This is not about catching out good installers. It is about spotting the difference between a proper survey and a guess with a logo on it.

Start with the survey, not the sticker price

A proper air-con quote starts with someone looking at the room. Not just a quick glance and a question about square metres, but a real look at glazing, insulation, ceiling height, occupancy, equipment and how the space is used. A small office with three computers and a server cabinet is not the same as a bedroom of the same size. A shop with fridges, ovens or a south-facing window can need more cooling than the floor area suggests.

If a quote arrives by text without a site visit, treat it as a starting point, not a final answer. It may be fine for a like-for-like replacement, but for a new installation it is usually too thin.

1. How did you work out the size?

Ask how the installer calculated the heat load. A proper answer will mention the room survey, the glazing, the orientation, the number of people, the equipment and the insulation. It may also mention a heat-load calculation or a site-specific assessment. A weaker answer is a rule of thumb like 'one kilowatt per ten square metres' or 'this unit is what we always fit'.

Sizing matters in both directions. Too small and the unit runs flat out, struggles on hot days and uses more energy. Too large and it may cool the room in short bursts without removing enough moisture, which can leave the space feeling clammy. For small firms, the equipment load is often the bit that gets missed. Tills, fridges, ovens, printers and servers all add heat.

2. Where will the condensate go?

This is the question that separates a thoughtful quote from a rushed one. Air-conditioning removes moisture from the air. That water has to leave the unit through a drain pipe, a gravity route or a condensate pump. Ask exactly where the pipe will run, how it will fall, where it will terminate and whether any permission is needed from a landlord or freeholder.

A good installer will talk about the route without being prompted. They will avoid draining into a cavity, onto a path where it can freeze, or into a waste pipe that cannot cope. In a flat or a shop with a back room, the condensate route can be the difference between a neat job and a damp patch six months later. If the quote says nothing about condensate, ask before you sign.

3. What will it sound like in real life?

Noise is personal, but it is not a mystery. Ask for the indoor and outdoor sound levels, and ask where the outdoor unit will sit. A unit outside a bedroom window or next to a neighbouring wall can become a problem, especially in summer when windows are open. In a small shop, the indoor unit may need to be sited away from a till or a quiet consultation area.

It is also fair to ask about vibration and how the outdoor unit will be mounted. A bracket on a hollow wall can transmit noise in a way that a proper anti-vibration mount will not. If the outdoor unit is visible from the street or close to a boundary, check whether planning permission or landlord approval is needed. A good installer will know the local picture and will not brush the question aside.

4. What does commissioning and handover include?

Commissioning is not a fancy word for switching it on. A proper handover should include checks on refrigerant charge, pressure testing, vacuuming the pipework, airflow, controls and drainage. You should be shown how to use the remote or thermostat, how to clean the filters and where the isolator is. You should also receive the paperwork: model and serial numbers, warranty registration, service recommendations and the installer's contact details.

Ask who will commission the system and whether the commissioning results are recorded. For a small firm, ask whether the installer will provide a simple maintenance schedule you can file with the building paperwork. If the answer is vague, the handover may be vague too.

5. What exactly does the warranty cover?

Manufacturer warranties and installer warranties are not the same thing. Ask what is covered for parts, what is covered for labour, how long each lasts and what conditions apply. Many warranties depend on annual servicing being carried out, so ask whether servicing is included or what it costs. Also ask how to report a fault and what the typical response time is.

A friendly but firm question is: 'If the unit leaks from the condensate pipe in three months, who pays for the call-out and the repair?' The answer tells you a lot about the quote. A proper installer will have a clear position. A shortcut quote often becomes vague at this point.

Red flags in a Sutton quote

Watch for a quote that is just a unit model and a price. Watch for no site visit, no mention of condensate, no commissioning details and no written warranty terms. Be cautious if the price is dramatically lower than the others without a clear reason. And be wary of anyone who cannot explain why they have chosen a particular size or location. A cheap install can cost more in the long run through poor drainage, noisy operation or a warranty that does not cover the labour.

What a proper handover looks like

A good handover is short, practical and documented. You should know where the isolator is, how to clean the filter, what the display means and who to call. You should have the drain route explained and the outdoor unit pointed out. And you should have a folder, digital or paper, with the model details, warranty information and service record. That is not fussy. It is what makes the system easy to live with.

If you are comparing quotes for a home, shop, café or small office in Sutton, Cheam, Carshalton, Wallington or Morden, we are happy to talk through the details before you sign. A few good questions now can save a lot of head-scratching later.