Advice and guides
Straight answers to the questions people ask before they buy and once it's running: what it costs, what size you need, how quiet it is, planning, servicing, and what to do when it plays up. Checked against official sources and manufacturers' manuals.
Buying, costs and planning
Cost guide
What air conditioning costs in London and the Home Counties in 2026: our prices from £1,850 inc. VAT, market ranges, extras, running and servicing costs.
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Running costs
What air conditioning costs to run per hour, night, month and year at the Oct to Dec 2026 Ofgem cap, for 2.5, 3.5 and 5 kW units, cooling and heating.
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Best brand
Daikin, Mitsubishi Electric, LG or Panasonic? Efficiency, noise, warranty and servicing terms from each maker's UK data, and which suits your home.
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Daikin vs Mitsubishi
Daikin Perfera vs Mitsubishi Electric MSZ-LN: efficiency, noise, sizes, apps and warranty terms from each maker's UK data, compared side by side.
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How often to service
How often to service air conditioning: what Daikin, LG and Panasonic ask for, F-Gas leak-check rules for larger systems, and a simple yearly schedule.
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Planning permission
Do you need planning permission for air conditioning? The rules in England since 29 May 2025: unit size, position, noise, flats and listed homes.
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Quiet air conditioning
How quiet is air conditioning? Manufacturer dB(A) figures for Daikin, Mitsubishi Electric, Panasonic and LG, quiet mode, bedrooms and neighbour noise.
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What a service includes
Every step of a proper air con service, indoors and out: filters, coils, drain, refrigerant checks, electrics and a written record. From £119 inc. VAT.
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What size do I need
What size air conditioner for your room: kW by floor area, plus glazing, lofts and south-facing rooms. 2.5, 3.5 and 5 kW explained for UK homes.
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Problems and repairs
Leaking water
Water dripping from your air con indoor unit? The usual causes, the safe checks you can do, what's normal outside, and when to book a £125 repair visit.
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Not cooling
Air con running but not cooling, or blowing warm air? Safe checks you can do yourself, what never to touch, and when to book a £125 diagnostic visit.
Read moreSmells
Musty, damp, burning or drain-like smell from your air con? What each smell usually means, what you can safely do, and when to switch off and call.
Read moreRepair or replace
Should you repair or replace your air conditioning? Age, R22 and R410A refrigerant rules, efficiency, parts and the real cost of each, explained.
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Error codes
Error codes
How to read an air con error code from the remote, the display or flashing lights on Daikin, Mitsubishi Electric, LG and Panasonic, and what's safe to try.
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Daikin error codes
What Daikin error codes like U4, U0, A5 and E7 mean, how to show the code on your remote, safe checks to try first and when to call an engineer.
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LG error codes
What LG air conditioning CH error codes like CH05, CH38 and CH61 mean, the safe checks LG recommends, and when you need an engineer to fix it.
Read moreMitsubishi Electric error codes
What a flashing light on a Mitsubishi Electric air conditioner means, how to count the flashes, common check codes like E6 and P5, and when to call us.
Read morePanasonic error codes
How to read a Panasonic air conditioning error code with the CHECK button, what codes like H11, H99 and F91 mean, safe checks and when to call us.
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