Are you using portable electric heaters? This form of space heating is inefficient at warming a room, costing you energy and money. Consider the benefits of a centralised Variable Refrigerant Flow (VRF) system, where both heating and cooling can be delivered using refrigerant as the medium. These systems are very efficient, costing at a minimum a third of the running costs of an electric space heater. This kind of heating provides an efficient, easy to control and easy to install method of heating large spaces such as schools and older offices. It also prevents disruptive upgrades to full height standing fan heaters or localised panels.