A: When it is a case of designing new surgery premises, NHS guidance encourages buildings that have natural ventilation and therefore do not need air conditioning.
However, where there are specific reasons, for example, internal rooms with no natural light or where windows must remain closed because they would open on to a public right of way, it is not uncommon for air conditioning to be provided for all or part of a surgery.
You question whether you are legally obliged to fit an air conditioning unit in a room where temperatures regularly reach 30-33° C or if the landlord is legally required to fit air conditioning. I am unaware of any legal requirement or statutory temperature limits, and under a normal commercial lease, fitting air conditioning is unlikely to be a landlord requirement.
If it is essential for the well-being of your patients, the PCT may accept it as a necessity, and either help by way of an improvement grant or allow the district valuer to include it as an improvement that will increase the level of rent reimbursement. If the reimbursement can be increased, it may be possible that in return for extra rent, the landlord will provide the air conditioning unit.