37 Maintenance, repair and installation of power generating apparatus, alternators, machine tools, fuel tanks, compressors, air compressors, oil-free air compressors, batteries, transformers, load banks, cable and distribution equipment, electrical distribution systems, solar heating and lighting apparatus, energy control devices, temperature and moisture control equipment, energy regulators electrical distributors, solar powered systems, solar powered heating and lighting systems, energy-saving apparatus, gas supply and distribution apparatus, power distribution apparatus, HVAC (heating, ventilation and air conditioning) systems, air conditioning apparatus and installations, cooling apparatus and installations, drying apparatus and installations, air heating apparatus and installations, heat pumps and lighting apparatus; rental of air compressors, oil-free air compressors, construction equipment and building apparatus; information, consultancy and advisory services in relation to the aforesaid.