Heating & cooling

Use one evidence trail from need to contract

Start with the rooms, building fabric and comfort problem before choosing equipment. Summer overheating and winter heat loss share evidence—glazing, roof exposure, draughts, insulation and occupancy—but the correct response may be shading, ventilation, a portable appliance, a boiler improvement or a professionally designed heat pump.

Capacity labels and headline efficiency cannot replace a room or building assessment. Portable air conditioners require a safe exhaust route. Fixed refrigerant systems require appropriately qualified work, while external equipment can introduce planning, acoustic and private-consent questions. Compare the complete installed route rather than the appliance alone.