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Clima NordAir conditioning · Burjassot
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Technician in a hard hat and hi-vis vest walking across a roof past the outdoor units

120 m² shop with a west-facing window

In the afternoon the sun pours straight through the glass and the shop heats up just when it’s busiest. Here’s how two cassettes in the suspended ceiling sort it out. Sample job with sample data.

C-01 Premises data sheet

Use
Clothes shop, open 10:00 to 20:00
Floor area
120 m²: 90 of sales floor, 6 of fitting rooms and 24 of stockroom
Orientation
8 m shop window facing west, no awning
Ceiling
Suspended grid ceiling at 2.80 m
Old equipment
Two fifteen-year-old wall splits
New system
Two 4-way cassettes with heat pump
120 m²of floor space, 90 of it air-conditioned
13,000frig/⁠h (15 kW) across two 6,500 units
2 daysof work, with the shop closed on a Monday
€4,500–5,900guide price, unit and installation

C-01.1 Installation plan

Two zones, one per cassette

Each cassette covers half the shop and blows air out on its four sides. The pipes run through the suspended ceiling to the stockroom and up to the roof.

Shop floor plan: west-facing window, sales floor with two cassettes, fitting rooms, stockroom and pipe riser to the roof 12.00 m · sales 3.00 m 8.00 m WEST · AFTERNOON SUN RISER TO ROOF Zone A window · 6,500 Zone B back · 6,500 FITTING ROOMS TILL STOCKROOM not cooled ENTRANCE ON THE ROOF 2 units N
4-way cassette Refrigerant and drain pipes Shop window

Example plan, not exactly to scale. On a phone you can scroll it sideways.

C-01.2 The calculation

Why it comes to 13,000 frigorías (15 kW)

It’s the same sum as the calculator. What weighs most here is the shop use and the west-facing glass.

Open this in the calculator

Sales floor: 90 m² × 90 frigorías8,100
A shop, not a home: people coming in and spotlights on× 1.20
West-facing window, afternoon sun× 1.15
Six people on average, four above two+ 400
What the shop needs11,578
Two 6,500 cassettes, one per zone13,000 frig/⁠h

C-01.3 The work

From the visit to switch-on

  1. Day 0
    Visit

    We measure up and check the suspended ceiling and the pipe route to the roof.

  2. Day 1
    Fixed quote

    Two options in writing: cassette or ducted, with price and timescale.

  3. Works · 1
    Pipes and units

    With the shop open: roof, brackets, pipes through the stockroom.

  4. Works · 2
    Cassettes and switch-on

    A Monday with the shop closed: ceiling, vacuum, charge and test.

C-01.4 Decisions

Three things decided at the visit

Decision 1

Cassettes, not ducts

The grid ceiling was already there: the cassettes go in by lifting out tiles, with no grille work and no hidden unit.

Decision 2

Two units, not one big one

The window zone needs a lot more in the afternoon. With two, each works at its own pace, and if one fails the shop isn’t left without air con.

Decision 3

Outdoor units on the roof

On the façade they’d bother the neighbours and make noise in the street. Up top they’re shaded by the roof structure and can be serviced without scaffolding.

Café ceiling with a cassette unit between cable trays, spotlights and pendant lamps
Fig. C-01.aA cassette in a grid ceiling: from below you see a panel, not a machine.
Grey façade with four outdoor units hung beside a door and a fire hose cabinet
Fig. C-01.bWhat was avoided: four units on the street façade, right by the door.

C-01.5 Running costs

One summer with the old units and with the new ones

Ten hours a day, four months and electricity at €0.15/kWh. It’s an estimate using the calculator’s sum, not a bill.

New cassettes · SEER 6.1

€99 a month · €397 per summer

Fifteen-year-old splits · SEER 3

€202 a month · €808 per summer

About €410 less every summer, and the same units heat in winter.

Demonstration page prepared for Clima Nord. This is not the business’s official website.