HVAC (heating/ventilation/air conditioning) controls the air flow within your home. HVAC can be controlled in many different ways. As an integrated part of your smart home your furnace can be turned off automatically when a window is opened, thus saving energy. You can also securely connect to your homes automation system from anywhere on the world wide web and check the status or temperature at any time. This means that you can turn the heat on in your cottage from your office at 3pm on a Friday evening, it's that simple. The temperature in your home can also be dropped several degrees whenever you arm your security system in away or vacation mode, so there will be no more wondering if you did it manually before you left.