Office air con is more than just keeping people cool. Temperature (especially in the cold winters or warm summers) affects concentration, comfort, and staff satisfaction. No one is getting much work done on a hot, sticky afternoon or when it’s so cold they’re buried beneath three jumpers.
The ideal office temperature is around 21°C to 23°C. That can vary between people. However, finding a system that can consistently hit this temperature with minimal breakdowns and at the lowest cost is best for most office spaces.
In this article we’ll explore:
- Why “Standard” Residential Units Don’t Cut It in an Office
- The Top 3 Air Conditioning Systems for Small Office Spaces
- Key Factors to Consider Before Choosing an AC System
- The Importance of Professional Load Calculation
- Installation Costs vs. Long-Term ROI
- Office Air Con Frequently Asked Questions
Why “Standard” Residential Units Don’t Cut It in an Office
Residential and office AC units aren’t the same thing. Nor do they have the same demands. Offices usually have higher cooling demands than homes.
With more people, computers, monitors, printers, lighting, and meeting rooms, there’s a lot of added heat. Together, it places greater strain on the air con. Plus, the air con must run for 12 hours or so straight.
Residential units, on the other hand, are not designed for long daily running hours. They can also be noisy, inefficient, and expensive to run. That’s why it’s best to go for a specialist option.
Top 3 Air Conditioning Systems for Small Office Spaces
1. Wall-Mounted Split Systems
Generally, the most popular option for small offices. The relatively simple installation, good efficiency, and quick controls make it a sensible choice.
It works for:
- Open-plan spaces
- Small studios
- Reception areas
- Individual workrooms
The obvious downside is that it’s a visible indoor unit. That can also mean airflow is less evenly distributed in awkward layouts.
2. Ceiling Cassette Units
Not everyone wants the AC unit to be visible. If that’s the case, ceiling cassette units are a great option. They’re installed into a suspended ceiling, offering more discreet cooling and even air distribution than a wall-mounted unit.
For these benefits, you’ll pay slightly more. But for client-facing offices, meeting rooms, clinics, or salons, it’s often worth the expense.
3. Multi-Split Systems
Multi-split systems use several indoor units connected to one outdoor unit. That allows different rooms to be controlled individually.
Best for offices with:
- Separate rooms
- Meeting spaces
- Partitions
- Multiple zones
The added complexity increases the upfront cost. But it can help raise or lower the temperature in parts of the office without affecting the rest.
Personal air conditioners are also available. They can help one person hit the right temperature, but they’re usually not right for a whole office.
Find out more about the different types of air conditioners.
What are the Key Factors to Consider Before Choosing an AC System?
Energy Efficiency
Higher energy efficiency almost always means a greater upfront cost. But it will lead to lower running costs in the long term: something worth considering if the system is running for several hours a day.
You may see ratings such as SEER and SCOP. In simple terms, these help show how efficiently the system cools or heats over a season. However, the rating is only part of the picture. Good controls, correct sizing, and proper installation are just as important as the efficiency score on the spec sheet.
Noise Levels
The last thing anyone wants is a constant low hum when taking calls, holding meetings, or just trying to concentrate.
Look at the unit’s noise level as well as its cooling power. A cheaper unit may offer the same cooling power, but if it is badly positioned or noticeably loud, it can become a daily frustration. Lost productivity is just as much a cost as the unit itself.
At our showroom in Kenilworth you can see our air con systems in action, and hear how noisy they really are.
Smart Controls
Smart controls mean you can schedule the air con for working hours, adjust temperatures remotely, and avoid cooling an empty building.
Instead of different staff members changing the temperature throughout the day, the system can be set to run on a sensible schedule. The idea is that it reduces wasted energy.
Size and Layout
Perhaps the biggest factor: an undersized system will have to run constantly, whereas an oversized system can lead to short cycling, uneven comfort, and wasted energy.
You want the Goldilocks option. That requires a professional to evaluate your space and select the right-sized unit.
The office layout matters too.
Open-plan offices, glass frontage, internal partitions, and meeting rooms affect how air flows around the building. Meanwhile, the number of people and servers can increase the heat emitted. The right office air con factors in these elements.
What’s the Importance of Professional Load Calculation?
British Thermal Units (BTU) should not be guessed. They’re a measure of cooling capacity: how much heat the system can remove from a room.
The higher the BTU rating, the more powerful the air conditioner.
For example:
- A small room might need around 5,000–8,000 BTU
- A larger office might need 12,000–18,000 BTU
- A busy or hot office with lots of people, screens, or south-facing windows may need more
BTU cannot be “guesstimated.” That’s how you end up with under- or over-sizing. A proper load calculation is needed, evaluating room size, ceiling height, insulation, window orientation, glazing, occupancy, lighting, ventilation, and office equipment.
Even small details like a large south-facing window or poor ventilation matter. That’s why you want to get a professional evaluation.
Installation Costs vs. Long-Term ROI
Most businesses feel the upfront cost more than the monthly running cost. But choosing the cheapest system can be a false economy if it leads to higher bills, more noise, or more frequent repairs.
You want to factor in running costs, servicing, warranty, energy efficiency, and expected system lifespan into your decision. It’s better to spend a little more on a more efficient system, especially if it’s running every day.
By contrast, if you only use the air con occasionally, a cheaper system (even if noisier and less efficient) may offer better value.
Premium Heating, Plumbing & Cooling can help you pick the right AC unit for your office. From professional load calculations to ongoing servicing, we support businesses big and small with all their cooling needs. Get in touch to learn more about our services.
Office Air Con Frequently Asked Questions
Which is the quietest commercial AC for a small office?
Ceiling cassettes are one of the quietest options, as they’re concealed within a suspended ceiling. However, noise depends on the model, indoor unit type, and installation position.
Always check the manufacturer’s decibel rating and consider where the unit will sit relative to desks and meeting areas.
How much does it cost to install air conditioning in a small office?
For a small office, a single wall-mounted split air conditioning system will usually cost around £1,500–£3,000 installed, while a more complex multi-split setup can cost £3,000–£6,500+.
Do I need planning permission for an office AC unit?
Sometimes, depending on whether the property is listed or in a conservation area. Commercial premises typically have greater restrictions than homes. Landlord permission is also required for rented offices.
How often should an office AC system be serviced?
Usually at least once a year. If the AC system is used heavily every day, it might be worth servicing every 6-9 months.
Read Next: What to Do If Your Air Conditioner is Blowing Warm Air?
