M&E Contrax Resources

Air Conditioning

Resource Highlights:

Most fitted air conditioning systems are air-to-air heat pumps, meaning they provide cooling and efficient heating.

Costs vary significantly based on system type, number of rooms, pipe runs, electrics, access, and finishes, so a survey is the best way to get an accurate quote.

A practical guide to heating and cooling with modern air-to-air systems

Air conditioning is no longer just a “nice to have” for the odd hot week. UK summers are warmer, more homes are overheating, and many households and businesses now want better control over comfort, sleep, and indoor air quality.

The important thing to know is that most modern fixed air conditioning systems are actually air-to-air heat pumps. That means they can cool in summer and heat in winter, making them a year round solution, not just seasonal cooling.

For grants and funding, read our guide on the Government’s UK Warm Homes Plan 2026 here.

What is air conditioning, and how does it work?

A fixed air conditioning system usually has:

an outdoor unit that moves heat in or out

one or more indoor units that deliver cooled or warmed air

In cooling mode, it removes heat from the room and releases it outside. In heating mode, it does the reverse, pulling heat from the outside air and delivering it indoors. This reversible “heat pump” operation is why air conditioning is increasingly being used as part of efficient, low carbon heating strategies.

Types of air conditioning systems

Portable air conditioners

A temporary solution that is easy to move, but typically less efficient and usually noisier. Often chosen for occasional use or where fixed installation isn’t possible.

Single-split systems

One outdoor unit feeding one indoor unit. A popular option for a bedroom, home office, lounge, or single commercial room.

Multi-split systems

One outdoor unit feeding multiple indoor units. Useful if you want heating and cooling across several rooms while keeping outdoor units to a minimum.

Ducted systems

A discreet option for whole floors or larger properties, with vents rather than wall-mounted units. Usually requires more planning and installation work.

What affects the price of air conditioning?

Rather than focusing on headline figures, the best way to compare quotes is to understand the main cost drivers:

Number of rooms and indoor units

Pipe run length and route complexity (straight through a wall vs long concealed routes)

Electrical work required (isolators, supply capacity, access to consumer unit)

Access and installation difficulty (height, scaffolding, tricky external mounting)

Outdoor unit location (distance, brackets/base, airflow clearances)

Condensate drainage route and fall

Finishes (making good, trunking concealment, internal routing)

A proper survey ensures the quote reflects the real scope, not assumptions.

Running costs and efficiency

Running costs depend on:

your electricity tariff

unit efficiency and sizing

how often you run it

room insulation and air leakage

temperature set points and usage habits

Most people get the best value by conditioning the rooms they actually use, rather than trying to cool or heat the whole house all at once.

Simple overview

If you want the simplest approach, follow this order:

Choose the rooms that matter most, bedroom, home office, living space, business room

Decide whether you want cooling only or year-round heating and cooling

Confirm indoor unit placement and outdoor unit location options

Get a proper survey to size the system correctly

Compare quotes on specification and finish, not just price

Make sure commissioning, controls setup, and handover are included

This avoids the most common issues, incorrect sizing, awkward positioning, and unexpected installation add-ons.

Frequently Asked Questions

Yes, most modern fixed systems are air-to-air heat pumps, so they can heat in winter and cool in summer.

A single-split system is often the simplest option for one room, but correct sizing and placement still matter.

Noise varies by unit and installation quality. Outdoor positioning and vibration isolation also make a big difference.

In many cases, no, a typical air conditioning installation can fall under permitted development. However, it depends on your property and location, for example listed buildings, conservation areas, flats, and some coastal or highly visible locations can have additional restrictions.

Outdoor unit position, distance to boundaries, and noise considerations can also affect what is allowed. The safest approach is to confirm this during your survey, and we will advise you before any work goes ahead.

Potentially, yes. In late 2025 the Government announced an expansion of the Boiler Upgrade Scheme (BUS) to include support for air-to-air heat pumps (modern air conditioning) for eligible properties. Scheme rules and availability can change, so it is best to check the latest position and confirm eligibility during your survey.