For a typical UK bedroom or living room next summer, the two quotes you are most likely to hold are Daikin Perfera and Mitsubishi Electric MSZ-AY. Both are reverse-cycle R32 wall splits with strong UK installer support. AY usually wins if night-time indoor sound is the brief. Perfera usually wins if you want Streamer filtration, occupancy sensing, or you already have Daikin outdoors. Neither badge fixes a noisy condenser or a refused balcony. Compare the same kW, the same outdoor position and the same drain, then pick the indoor.
Why these two names dominate quotes
UK domestic quotes for summer 2027 still cluster on a small set of wall units. Daikin Perfera is the everyday high-efficiency indoor most Daikin-trained firms put on a bedroom or home office. Mitsubishi MSZ-AY is the current quiet M Series workhorse, the model most Mitsubishi quotes should start from unless you asked for a designer fascia. Sensira, Comfora, Stylish, MSZ-HR and MSZ-LN sit around them. If your PDF only says Daikin or Mitsubishi, you are not comparing products yet.
Both heat as well as cool. Both need an F-gas install, a legal outdoor position and a dedicated supply. The brand war is smaller than the survey. Read the Perfera versus Stylish versus Sensira guide and the Mitsubishi AY versus LN guide if you are still inside one manufacturer.
- Perfera: Streamer, occupancy sensing, very high seasonal efficiency on smaller capacities.
- AY: extremely low indoor fan sound, strong UK winter heating, MELCloud.
- Labour, pipe route and outdoor siting move both quotes by the same amount.
- Do not mix a Daikin indoor with a Mitsubishi outdoor.
Which one for which room
Sleep is where AY earns its keep. Indoor night sound on AY is as low as any mainstream UK split, often quoted around 18 dB(A) on the quietest setting. Perfera is also a quiet indoor, but the Mitsubishi number is the one bedroom shoppers chase. Isolation of the outdoor unit still matters more than either indoor badge. The outdoor unit noise guide covers that.
Living rooms and home offices that will run hard in a heatwave are a closer fight. Perfera's efficiency and filtration extras help in a room you occupy all day. AY still cools the same kW class. A west-facing open-plan kitchen diner may need more than 3.5 kW from either brand. Size the room first. The 3.5 kW guide and the living-room buying guide sit next to this page.
Cost shape for next summer
As a 2026 planning illustration, installed single-split jobs in this class still sit in the high hundreds to low thousands of pounds including VAT for a straightforward house, with London access, pumps and long pipe runs pushing both brands equally. Equipment premiums swap around with distributor deals. A cheaper Perfera against a dearer AY is usually a different outdoor position or a missing drain pump, not a bargain.
Warranty length follows installer registration more than the logo. Ask who registers it and for how many years. Parts time in January is the test that ends forum arguments.
How to compare two quotes this week
Force both onto the same cooling kW, the same heating capacity at a stated outdoor temperature, the same wall, and the same condensate method. Then the remaining difference is indoor features, app, sound data and who will come back.
Use the quote form with room photos and name Perfera or AY if you were offered one. Local installers who stock both will say if Sensira or HR is enough for a spare room instead.
Frequently asked questions
Is Daikin Perfera better than Mitsubishi AY?
Not as a blanket rule. AY usually wins a bedroom on indoor sound. Perfera usually wins if you want Streamer, occupancy sensing or a Daikin multi-split outdoor. Compare the exact model codes and the outdoor position.
Can I put Perfera indoors on a Mitsubishi outdoor?
No. Stay inside one manufacturer's matched system. Mixing brands voids warranty and loses refrigerant control.
Which is cheaper to run?
Seasonal efficiency is close at 2.5 to 3.5 kW. Hours of use, filters and outdoor siting move the bill more than the badge. Ask for SEER and SCOP on the exact size, not a brochure maximum.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.