COST GUIDES
How much does HVAC cost in 2026 in the UK?
Updated 05/26
If you have one of those homes that’s always too hot in the summer and too cold in the winter, an HVAC system could be exactly what you need. Here, we’ll look at the average HVAC cost and which type you should go for.
Fast Facts
It costs an average of £17,000 to install a brand new HVAC system
If you're replacing an existing HVAC, expect to pay around £7,250
Costs can vary depending on the type of system, its efficiency rating, and the size of your property
If you have one of those homes that’s always too hot in the summer and too cold in the winter, an HVAC system could be exactly what you need. Here, we’ll look at the average HVAC cost and which type you should go for.
How much does HVAC installation cost?
| Item | Unit | Cost - low | Cost - high | Average cost |
|---|---|---|---|---|
| HVAC replacement | Whole system | £3,500 | £11,000 | £7,250 |
| New HVAC system installation | Whole system | £5,000 | £30,000 | £17,000 |
| Last updated: May 2024 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
To install a brand new HVAC system with ductwork, you can expect to pay somewhere between £5,000 and £30,000.
The average cost of a full new HVAC system is £17,000.
However, the new HVAC cost will depend on a number of factors, including what type of HVAC system you go for and its efficiency rating.
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How much does HVAC replacement cost?
If you need to replace an existing HVAC system, you could pay anywhere from £3,500 to £11,000. The average cost is around £7,250.
However, HVAC systems are made up of lots of parts, so you’re more likely to have to replace individual pieces of equipment as opposed to your whole system. For that reason, the price will vary based on which parts need replacing and their condition.
Which HVAC parts can I get replaced?
Here are the main components that may need replacing.
Thermostat: This is where you input the temperature that you want your home to be at. The thermostat communicates with the other parts of your HVAC system.
Indoor unit: This is made up of a furnace, air blower, evaporator coil and air handling unit. It’s where heat is absorbed and cooled inside your home.
Outdoor unit: This consists of a compressor, condenser coil and fan. It’s responsible for removing heat from inside your home.
Refrigeration lines: These are the lines that hold the refrigerant fluid which removes hot air from your home. The lines go between the indoor and outdoor units.
Ductwork: This is one of the most expensive components to install or replace. It runs through your whole home to circulate air and connects to the vents.
What affects the cost of a new HVAC system?
Here are some of the main factors that will influence your new HVAC will cost:
Size: Generally, the larger the unit the more expensive it will be. A larger property with many rooms will need a more extensive system - so expect to pay more for HVAC in a bigger house.
Efficiency rating: The efficiency of HVAC systems is measured in units called SEERs. This stands for Seasonal Energy Efficiency Ratio. Most systems have a SEER rating somewhere between 14 and 21. The higher the SEER rating, the more expensive your unit will be.
Type: The type of HVAC system you choose will impact both the cost of the new system itself and the HVAC installation cost. If a lot of ductwork is needed, for example, that can drive up labour costs.
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What is an HVAC system?
The name HVAC stands for ‘heating, ventilation and air-conditioning.’
Essentially, an HVAC system is an integrated system made up of many parts both inside and outside your home. These are responsible for maintaining your home’s temperature, cleaning the air inside and regulating your home’s humidity.
Confusingly, a HVAC system can also include an air conditioning unit!
What are the different types of HVAC system?
A few types of HVAC system are available in the UK. The most common ones are:
Split system: The most common type of HVAC. These have two main units – one for heating and one for cooling. They’re generally the most affordable in terms of equipment, but they have the highest HVAC installation cost because they require ductwork.
Mini-split or ductless systems: Unlike a split system, these don't require ductwork, so they have a much lower HVAC installation cost. However, the equipment will cost more as these systems consist of several individual units mounted to the wall of each room.
Hybrid split system: These use a combination of electric power and gas (as per central heating), and can switch between the two as they need to. They use a combination of thermostats and ductwork.
Heat pump systems: A slightly more green, and energy-efficient, system that incorporates air or ground source heat pumps for the heating element.
If you're not sure which system is best for your home or property, speak to a HVAC installer in your area for advice.
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FAQs about HVAC installation costs
An HVAC installation should include:
Supply and installation of the units
Pipework, ductwork, and insulation
Electrical connections
Testing, checking, and commissioning the system
Certification and warranty
Generally, HVAC is more expensive upfront to install, but costs less to run in the long run compared to a heater and air con. However, it can depend on what kind of systems you're comparing.
It may be possible to install a HVAC system in an old home, though there are some extra challenges - such as poor insulation, space constraints, and in some cases a limited electrical capacity.
Speak to a trusted HVAC installer for advice.
Yes, a HVAC can absolutely add value to your property. Some estimates say it can add up to 12% in value, in fact!
Technically speaking, 'HVAC' is an umbrella term that refers to a number of things that a system can do - that is, heating (and cooling), ventilation, and air conditioning.
An 'air conditioner', on the other hand, just refers to a piece of equipment that conditions the air in a space.
The most popular HVAC system for UK homes is a split unit system. The best type for your home, however, might be different - speak to a local HVAC installer to learn more.
Not in most cases. HVAC and air con installation usually fall under permitted development rights, meaning you're free to install it.
However, you may need planning permission if you have a large outdoor unit, are placing it on a pitched roof, or are in or next to a conservation area.
Check your local regulations before arranging your install.
Yes, as long as they're in good condition it's fine to keep existing ducts and just replace the HVAC unit.
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