01
Location of home air con unit
Where can the indoor unit go?
Wall mounted home air con indoor units typically require 10cm of clearance around them for air flow, they can be positioned on any wall in the home but if its not an outside wall the routing of the connecting pipes to the outdoor unit must be considered. This often requires H A C adding a condensate pump and trunking to hide the pipework which requires a 50mm diameter hole in the wall to reach the outdoor unit.
02
Power of home air con unit
How powerful does it need to be?
How many required kw per square meter
w/ m2 2.0kw 2.5kw 3.5kw 5.0kw 6.0kw 7.1kw
Living Room 125 16m2 20m2 28m2 40m2 48m2 56m2
Home Office 125 16m2 20m2 28m2 40m2 48m2 56m2
Kitchen 125 16m2 20m2 28m2 40m2 48m2 56m2
Bedroom 125 16m2 20m2 28m2 40m2 48m2 56m2
Loft Bedroom 150 13m2 16m2 23m2 33m2 40m2 47m2
Conservatory 200 10m2 12m2 17m2 25m2 30m2 35m2
Garden Room 200 10m2 12m2 17m2 25m2 30m2 35m2
03
Efficiency of home air con unit
Are heat pumps more efficient than gas for heating?
Modern air-to-air heat pumps are significantly more energy-efficient than gas boilers. While the most efficient A-rated gas boilers convert about 90–94% of the fuel they burn into heat, a heat pump operates at an average efficiency of 300–400%.
This difference arises from how each system generates heat:
- Gas boilers burn fuel to create heat, and some energy is always lost in this process.
- Heat pumps move heat from one place to another (in this case, from the outside air into your home), which is a far more efficient process. They use a small amount of electricity to power the system, with the bulk of the heating energy coming from the environment.
However electricity currently costs roughly 26p per kwh. Gas costs 6.4p per kwh
Cost example (based on a typical 3-bed home)
For a medium-sized home requiring 9,775 kWh of heat per year, Octopus Energy provides this comparison:
- New gas boiler: Running on a standard tariff, the annual bill would be approximately £1,755 (including gas and electricity for other uses).
- Latest heat pump: On a dedicated heat pump tariff, the annual bill would be around £1,387.
- Potential saving: This equates to a potential saving of around £368 per year with a heat pump.
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