HVAC & air con servicing in London
Modern apartments often have a whole heating, cooling and ventilation system in the cupboard: a heat interface unit, a cooling interface unit, fan coil units, MVHR and underfloor heating. We service it all in one visit and send a clear report with readings and photos.
What we do
- Air conditioning servicing, including Daikin split systems
- Fan coil unit servicing and repairs: actuators, valves and controls
- Heat and cooling interface units (HIU and CIU)
- MVHR servicing: filters, fans, condensate line and heat exchanger
- Underfloor heating manifolds
- Room controls, actuators and thermostats
- Leak detection sensors tested
- Faults found, readings taken and repairs quoted
- Air conditioning installed as part of our fit-outs, including VRV systems
What we check
- Air conditioning units. Controls, fan modes and speeds, fan motor and noise, electrical connections and PCB checked, air filters cleaned, evaporator coil, louvres and air vents disinfected, drain pans cleaned and flushed, and supply air temperature checked in heating and cooling.
- Fan coil units. Controls, actuators, fan speeds, leaks and insulation checked, filters cleaned and disinfected, condensate trays cleaned and grille temperatures recorded in each room.
- HIU and CIU. Strainers, valves, pumps, actuators and meters checked, with flow and return temperatures and flow rates recorded. More on HIU and CIU servicing.
- MVHR. Filters, fans, condensate line, heat exchanger, ductwork and air vents. More on MVHR.
- Underfloor heating. Actuators, flow rates, system pressure, isolation valves and water temperature checked, and any leaks or corrosion found.
Who it’s for
Annual servicing and tenant fault reports.
Several flats serviced with a report for each.
Heating, cooling and ventilation working as they should.
Recent jobs
- Air con refrigerant leak repair, Fulham (SW6). A scheduled F-gas leak check on a Daikin system found it had lost more than half its R410A charge. We recovered the remaining gas and traced the leak to a cracked brass flare fitting. That fitting is no longer made, so we replaced it with copper pipework, keeping the system’s other service ports for future visits. We pressure tested it with nitrogen at 35 bar with no drop, pulled a vacuum, recharged with new refrigerant and left it running properly. We also flagged worn fan motor bearings on the outdoor unit before they fail.
- HIU repair, Canary Wharf (E14). No hot water in a heat network flat: we replaced the failed pressure valve on the heat interface unit and tested the hot water before leaving. See more on our HIU and CIU repairs page.
- LG air conditioning fault, Lambeth (SE1). One zone of a ducted system kept switching on by itself with no demand. We reset and tested the system and traced the fault to the indoor unit’s control board and the zone controller. That zone was safely switched off at the tenant’s request, and we quoted to replace the faulty parts.
- Fan coil repair, Canary Wharf (E14). No heating or cooling in a high-rise flat. We replaced the motorised actuator on the kitchen fan coil’s cooling circuit, then testing showed the unit’s control board was not sending the 24V supply the actuator needs. Both the heating and cooling valves were also leaking and seized, and the bedroom fan coil had the same faults. Given the age of the units and how hard parts are to find, we advised the managing agent that replacing the fan coils would be better value than repair after repair, and quoted for it.
- Air conditioning service, Chiswick (W4). Two Daikin units in a rented flat, serviced for the letting agent. Filters cleaned, evaporator coils and grilles disinfected, drain pans cleaned and flushed, every fan speed and mode tested, and the supply air temperature checked at each grille in both heating and cooling.
- Full heating and cooling service, Islington (N1). A new-build apartment on a communal heat network. We serviced the heat interface unit, cooling interface unit, fan coil units, MVHR and underfloor heating in one visit. We found the HIU’s heating pump and expansion vessel had failed, a faulty pressure gauge on the CIU and a failed MVHR supply fan with worn-out filters. After cleaning the CIU strainer the chilled water flow stayed low, which pointed to the building’s communal system rather than the flat, so we said so in the report. The fan coil filters were cleaned and disinfected, and the managing agent got the readings, photos and a quote for the repairs.
Related services
Good to know
Common questions
Why is my air conditioning not cooling properly?
A common cause is a refrigerant leak: the system slowly loses gas through a cracked fitting or joint and cools less and less. We find the leak, repair it, pressure test the system with nitrogen and recharge it, rather than just topping the gas up so it leaks out again.
Does my air conditioning need an F-gas leak check?
Systems holding refrigerant equal to 5 tonnes of CO2 or more need regular leak checks by an F-gas certified engineer. Many larger home and office systems fall into this. We carry out the checks, keep the records and repair any leak we find.
Why does my air conditioning turn on by itself?
Usually a fault in the controls rather than the unit itself: a faulty wall controller, a failing control board (PCB) in the indoor unit, or a wiring or sensor fault. We test each part to find which one is at fault, can make the system safe in the meantime, and then quote for the repair.
Is it worth repairing an old fan coil unit?
Sometimes. If it is one failed part, a repair is usually fine. When we find several faults, such as a failed actuator, a control board fault and leaking or seized valves, on units where parts are hard to get, we will tell you honestly if replacing the fan coil is better value.
Do you service air conditioning units?
Yes. We service split air conditioning units such as Daikin: filters cleaned, coils and grilles disinfected, drain pans flushed, fans and controls tested and air temperatures checked, with a report for the landlord or agent.
What does an HVAC service include?
In an apartment we usually service the heat interface unit, cooling interface unit, fan coil units, MVHR and underfloor heating in the same visit, then send a report with readings, photos and a quote for anything that needs fixing.
Is comfort cooling the same as air conditioning?
Not quite. Many new-build flats have comfort cooling, where chilled water from the building’s central plant runs through fan coil units in the ceiling. We service those units and the cooling interface unit that feeds them.
Can you service the MVHR at the same visit?
Yes. We check the filters, fans, condensate line and heat exchanger, and replace filters or fan motors when they need it.
Do you send a report?
Yes. You get the readings we took, photos of what we found and a written quote for any repairs, so landlords and managing agents can approve the work.
Which areas do you cover?
We work across London and Essex from our base in Chigwell, including a lot of new-build apartment blocks in central and east London.
Got a job that needs doing? Let’s get it sorted.
Tell us what you need and you’ll get a clear, written price back.
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