A boxing gym should be sized from the people in it, not from the floor area. An empty mat looks large and cools easily. Twenty people on bags, pads and the ring at once is a high sensible and latent load in a room that may not be huge. Sweat, smell and a coach who has to be heard are part of the survey. A split recirculates, so fresh air stays a ventilation question. If the effective rated output is more than 12 kW, the operator has the inspection duty on GOV.UK's air conditioning inspections page, including a TM44 report. Use an F-gas certified company.
The class on the bags, not the empty mat
Floor area is a poor proxy. The ring, the bag line and a pads class can pack working people into a neighbourhood unit with a normal shop footprint. Ask for the busiest hour: how many people are training, not how many members exist on a spreadsheet. Add sun on a roof or a roller door if that is the fabric. A modest room with a full class can need more cooling than a large empty floor.
Latent heat from sweat is why the coil runs wet and the room still feels heavy if there is no fresh air. Cooling can knock the temperature back. It will not freshen a sealed gym, and it will not remove the smell. Say whether an extract fan already exists. A clean filter helps the coil. It is not a fresh-air system.
A coach calls combinations. An indoor unit that only holds the room on high fan will fight that. Ask for the fan speed you will actually run. HSE workplace temperature guidance applies to coaches and staff: reasonable comfort for the work, no legal maximum temperature. Members are the heat gain. A setpoint in the mid 20s is more honest for a hard session than a cold target the plant never holds.
Bags, the ring and a condenser at 7pm
The outdoor unit on a yard wall at 7pm is the noise neighbours hear. Anti-vibration mounts and a position off bedroom windows matter in a terraced industrial unit.
Walls are taken by bags, mirrors and racks. A wall unit needs a clear high wall that a bag cannot swing into, plus filter access that does not cross the ring. The indoor unit should sit high, clear of swinging bags and the ring, with a throw into the occupied band. It has to be reachable for the filter without closing the gym in an unsafe way. A cassette needs a void many older gyms do not have. High rooms stratify, so aim air at the occupied band, not only the roof steel.
Condensate on a training floor is a slip. Drain it properly, with a pump alarm if there is no fall. Power is often a board already full of machines. Landlord consent for the core and the condenser comes before the kit is ordered. Three-phase supply is a fair question once the people load pushes the plant up. The people count used for the load should be stated, and fresh air should be named as excluded when it is not in the cooling scope. An F-gas certified company installs the refrigerant circuit.
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.