Is Air Conditioning Bad for Your Health? Myths vs Facts for Workplace Indoor Air Quality

If you manage an office, retail unit or industrial facility somewhere in the South of England, you've almost certainly had the conversation and if you manage it well, you've probably grown tired of it. Someone complains the air conditioning is making them ill, someone else insists the office air is giving them a sore throat and others blame the HVAC for every cold that does the rounds each winter. These complaints land on your desk with predictable regularity, particularly during warmer months when systems are running hard.

At E3 Engineering Services in Milton Keynes, we design, install, maintain and repair HVAC systems for commercial, industrial and retail clients across the South of England and we've heard every version of this story.

Myth 1: Air conditioning gives you colds

Air conditioning does not cause viral infections, because colds and flu are spread by viruses passed between people and the temperature of the air has nothing to do with that. What can happen is that dry air from a poorly maintained system makes people uncomfortable (dry eyes, sore throats, blocked noses) which can feel like the early stages of a cold. Modern, properly serviced systems control humidity well enough to reduce this significantly. The real problem, when there is one, comes from inadequate ventilation and dirty components rather than the cooling process itself.

Myth 2: Air conditioning recirculates germs

This one has some truth in it but only when systems are neglected, because good commercial setups combine air recirculation with fresh air intake and proper filtration while the danger comes when filters are clogged or condensate drains are dirty, giving bacteria and mould somewhere to grow. Cleaning condensate trays, clearing drain lines and replacing filters on schedule removes the damp, stagnant conditions that allow bacterial and mould growth. Our FGAS registered engineers clear condensate drains and inspect evaporator coils as part of every planned maintenance visit and consistent planned maintenance in the buildings we look after in Milton Keynes and Watford has measurably reduced indoor air quality complaints.

Myth 3: Air conditioning causes dry throats and dry air

This is probably the most common legitimate complaint we hear and it's almost always a maintenance or design problem rather than something unavoidable. Older or oversized systems can strip too much humidity from the air, whereas inverter driven units modulate compressor speed continuously rather than cycling on and off at full load, which reduces the sharp humidity drops that fixed speed systems tend to cause. Properly sized installations help too and occasional humidification is worth considering during the drier winter months.

Myth 4: Air conditioning is bad for allergies and asthma

The opposite is often true. Correctly graded and regularly replaced filters in commercial HVAC systems can remove dust, pollen and other airborne particles, reducing concentrations in the space in ways directly relevant to occupants with hay fever or asthma. The problem arises when filters are old and clogged, at which point they start pushing trapped particles back into the room rather than capturing them. In buildings with high occupancy, sticking to a strict filter replacement schedule is one of the most straightforward things you can do to protect air quality.

What actually affects indoor air quality

Poor air quality in commercial buildings usually comes down to a handful of practical issues: infrequent or poor quality maintenance (dirty coils, blocked filters and neglected condensate trays are the most common culprits), inadequate fresh air ventilation especially in refurbished buildings where energy efficiency was prioritised at the expense of air exchange, poor system design or zoning that leaves stagnant areas or over cools parts of the building and a lack of CO2 or humidity monitoring, which many buildings still have none of at all.

Building Regulations Part F has placed greater weight on ventilation since the pandemic and property managers are now expected to demonstrate that adequate fresh air is being supplied.

How to actually improve things

Commercial systems should be serviced at least once a year, twice for high use buildings, covering deep cleaning of indoor units, refrigerant checks, drain cleaning and filter replacement. Where it makes sense, upgrading to higher grade filters is worthwhile, particularly in busy offices or high footfall retail spaces. Modern systems can also balance energy efficiency with adequate fresh air intake and heat recovery ventilation is something we often recommend for exactly this reason, since it maintains air quality without wasting energy on heating or cooling the air you've just expelled. Simple IAQ monitors showing CO2, humidity and particulate levels in real time can identify problems early and they are not expensive. We install and maintain Mitsubishi and Daikin systems, brands we use because parts availability, warranty terms and local technical support in our region make them consistently reliable choices for our clients.

Two examples from our work

In one Milton Keynes office building, complaints about dry air and persistent tiredness stopped after we introduced a bi annual maintenance programme and replaced old filters with better grade alternatives. A retail client in the same region reported a noticeable reduction in staff sick day absences in the months following an upgrade from ageing split systems to a modern VRF setup with improved ventilation control.

About E3 Engineering Services

Our team holds Mitsubishi and Daikin accreditations, FGAS registration, SafeContractor approval and City & Guilds electrical qualifications, built up across 19 years of commercial HVAC work across the South of England. We fix problems when they occur but the more valuable part of what we do is helping clients avoid them through planned maintenance and targeted upgrades.

Get in touch

If you manage commercial property in Milton Keynes, Northampton, Cambridge or anywhere across the South of England and you're dealing with indoor air quality concerns or staff complaints, get in touch and we will arrange a visit, check your system and maintenance records and give you a straight assessment of what needs doing.