Daikin CTXM+FTXM 5 kW (CTXM15M2V1B / 2MXM50M) — will it pass the neighbour noise test?

Name: Daikin CTXM+FTXM 5 kW (CTXM15M2V1B / 2MXM50M)
Brand: Daikin
Author: Igor Ivitskiy

At 3 m from your neighbour's window it gives ≈42.5 dB(A) — over England's 37 dB(A) limit; at 5 m it is still over (≈38.0). Manufacturer-declared 60 dB(A) LwA (the manufacturer's outdoor sound-power number), 3 dB quieter than the median 5 kW unit (663 families). £ per summer ≈£61.93 at 400 hours and 26.32p/kWh (estimated from 5.0 kW ÷ SEER (summer cooling efficiency; higher uses less electricity) 8.5). At 200 hours ≈£30.96, at 800 hours ≈£123.86. This outdoor unit is registered with 2 indoor units.

fail

Already calculated for one unit, Q=2 (sound spreading from a unit stood against a wall), no barrier

1 m · ≈52.0 dB(A) · fail
3 m · ≈42.5 dB(A) · fail
5 m · ≈38.0 dB(A) · fail · within 2.0 dB
8 m · ≈34.0 dB(A) · pass
12 m · ≈30.4 dB(A) · pass

line · Daikin CTXM+FTXM 5 kW (CTXM15M2V1B / 2MXM50M) · estimated sound pressure · ≈42.5 dB(A) at 3 m vs 37.0 dB(A) MCS 020a · checked 2026-09-25

Estimated sound pressure for Daikin CTXM+FTXM 5 kW (CTXM15M2V1B / 2MXM50M) at Q=2 and Q=4, one unit, no barrier. Scotland is assessed at 1 m only.
Distance	Q=2 dB(A)	Q=2 verdict	Within 2.0 dB	Q=4 dB(A)	Q=4 verdict
1	52.0	fail	no	55.0	fail
3	42.5	fail	no	45.5	fail
5	38.0	fail	yes	41.0	fail
8	34.0	pass	no	37.0	pass
12	30.4	pass	no	33.4	pass
Scotland 1 m	53	fail	no	—	Scottish legal point is 1 m, so Q=4 is not a second legal column here
Indoor units	2	registered on this card	registered on this card	registered on this card	registered on this card

EPREL https://eprel.ec.europa.eu/screen/product/airconditioners/221079 · 2026-09-25 · n=1 · MCS 020a Issue 1.1 inverse-square formula via contract_engine, Q given, barrier none · updated 2026-09-25 · version 1.0.0 · CSV of the values on this page · class MOD-C02

MCS-020A-STEP8 · §3.2 Step 8 · checked 2026-09-25. If the calculated sound pressure level at all assessment positions is equal to or lower than 37.0 dB(A) then the heat pump will comply with the Permitted Development noise limit Source

Full engine wording and the measurement caveat

≈42.5 dB(A) at the assessment position (estimated by the MCS 020a method, manufacturer-declared LwA; not a measured level, proof of permitted development, or a guarantee against nuisance).

What cooling capacity is registered for this family?

Daikin CTXM+FTXM 5 kW (CTXM15M2V1B / 2MXM50M) is registered at 5.0 kW cooling design load (EPREL, manufacturer-declared, checked 2026-09-25). A room-area conversion is not on file: this build does not apply an uncited floor-area rule.

computed

Registered capacity. Room area is not converted.
Field	Value	Status
Cooling design load, kW	5.0	manufacturer-declared

EPREL https://eprel.ec.europa.eu/screen/product/airconditioners/221079 · n=1 · value copied from the EPREL family row; no floor-area rule applied · same check date as the first block · CSV of the values on this page · class unmatched

Full engine wording and the measurement caveat

not a measured level, proof of permitted development, or a guarantee against nuisance

Do I need planning permission for this family in England, Wales or Scotland?

Class G (the England and Wales rule for a heat-pump outdoor unit) is not a yes from the model card alone. Product class is multi. On a house in England the outdoor unit has to be under 1.5 m³, meet 37 dB at the neighbour's window and stay off a road-facing wall in a conservation area; a block of flats is one unit up to 0.6 m³ (Class G as amended 29 May 2025, checked 25 Sep 2026). The address, the volume and the wall are what the planning check still needs. In Northern Ireland the outdoor unit is Class G of SR 2015/70 as substituted by SR 2023/95: a dwellinghouse, used to provide heat, and MCS 020 Issue 1.3 (42 dB(A)), not the England 37 dB figure.

address not supplied

Class G limits for a reversible unit. The address, volume and wall are still to enter.
Nation	Result	Still to enter	Cited point
England	not supplied	address, volume and wall still to enter	Class G, permitted development
Wales	not supplied	address, volume and wall still to enter	Class G, permitted development
Scotland	not supplied	address, volume and wall still to enter	Class 6H (Scotland's rule for a heat pump used for heating)(1)
Northern Ireland	not supplied	address, volume and wall still to enter	Class G

https://www.legislation.gov.uk/uksi/2015/596/schedule/2/part/14 · n=1 · evaluate_pd with building, volume, noise and siting still to enter · same check date as the first block · CSV of the values on this page · class PLN-C06

ENG-02 · G.1. Development is not permitted by Class G unless the air source heat pump complies with the MCS Planning Standards. Source

Full engine wording and the measurement caveat

not a measured level, proof of permitted development, or a guarantee against nuisance

£ per summer at the price-cap tariff

£ per summer ≈£61.93 at 400 hours and 26.32p/kWh (estimated from 5.0 kW ÷ SEER 8.5). At 200 hours ≈£30.96, at 800 hours ≈£123.86. Electrical draw ≈0.588 kW, estimated from 5.0 kW ÷ SEER 8.5, tariff 26.32p/kWh (Ofgem price cap, 2026-10-01 to 2026-12-31, checked 2026-09-25). The hours are a scenario, not a measured summer.

computed

Scenario hours at 26.32p/kWh (Ofgem price cap, 2026-10-01 to 2026-12-31). Not a measured bill.
Quantity	Value	Unit
SEER	8.5	ratio
Design load	5.0	kW
Electrical draw	0.588	kW
£ per summer, 200 h	£30.96	GBP
£ per summer, 400 h	£61.93	GBP
£ per summer, 800 h	£123.86	GBP

EPREL https://eprel.ec.europa.eu/screen/product/airconditioners/221079 · n=1 · kWh per hour ≈ design load ÷ SEER; not a measured bill · same check date as the first block · CSV of the values on this page · class unmatched

Full engine wording and the measurement caveat

not a measured level, proof of permitted development, or a guarantee against nuisance

What unit price was observed?

No dated unit price is stored for Daikin CTXM+FTXM 5 kW (CTXM15M2V1B / 2MXM50M). Price status: not on file. A median is not published from a missing price.

not on file

Observed prices joined on the retail SKU. One row is not a median.
Retailer	Price GBP	Observed	SKU
not on file	not on file	not on file	not on file

no retail observation · n=1 · price copied from unit_prices_observed.csv; no inferred street price · same check date as the first block · CSV of the values on this page · class MOD-C10

Full engine wording and the measurement caveat

not a measured level, proof of permitted development, or a guarantee against nuisance

Does the £2,500 air-to-air grant attach to this family?

England and Wales: not supplied. £2,500 for air-to-air heat pumps (AAHP) (in residential properties only) (p.6 summary table, checked 2026-09-25). Scotland: no. We will not cover: … Air to air heat pumps. (eligible costs, air-to-water/ground/water-to-water heat pump section, checked 2026-09-25). Northern Ireland: no. Only properties located in England and Wales are eligible for BUS funding. (§3.28, checked 2026-09-25). Home inputs that the engine still needs are listed with the verdict, not assumed.

not supplied

Grant engine by nation. Household predicates were not supplied.
Nation	Eligible	Wording
England	not supplied	Cannot determine BUS eligibility — property_type is not known.
Wales	not supplied	Cannot determine BUS eligibility — property_type is not known.
Scotland	no	Home Energy Scotland's grant and loan scheme does not cover air-to-air heat pumps ('We will not cover: ... Air to air heat pumps.').
Northern Ireland	no	Only properties located in England and Wales are eligible for BUS funding (Ofgem Boiler Upgrade Scheme installer guidance v5.1, §3.28). The £2,500 grant does not apply in Northern Ireland.

https://www.ofgem.gov.uk/sites/default/files/2026-07/boiler_upgrade_scheme_guidance_for_installers_v5.1_20260630135616-20260701135531.pdf · n=1 · evaluate_grant; property type still to enter; Scotland uses technology air_to_air only for air-to-air classes · same check date as the first block · CSV of the values on this page · class unmatched

BUS-amount · p.6 summary table. £2,500 for air-to-air heat pumps (AAHP) (in residential properties only) Source

Full engine wording and the measurement caveat

not a measured level, proof of permitted development, or a guarantee against nuisance

Which refrigerant is registered?

Registered refrigerant: R-32, GWP (how strongly the refrigerant warms the climate) 675 (EPREL, manufacturer-declared, checked 2026-09-25). No extra hazard class is added here beyond the registration.

computed

Refrigerant as registered. No hazard class is inferred.
Field	Value
Refrigerant	R-32
GWP	675

EPREL https://eprel.ec.europa.eu/screen/product/airconditioners/221079 · n=1 · copied from the EPREL family row · same check date as the first block · CSV of the values on this page · class unmatched

Full engine wording and the measurement caveat

not a measured level, proof of permitted development, or a guarantee against nuisance

Next steps for this model

Better than a bare specification row: the neighbour-window distance is scored pass or fail against the MCS limit, with the clause and the check date.

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