Regardless of popular belief, understanding an HVAC system is not all that complicated.
A typical Air conditioner will rest outside the home and it works by taking the moderate air around it and cooling it with some power source or coolant.
Then the air conditioning system blows the air through the air vents that are installed throughout the house. The air vents are the passageway for both the air from the air conditioning system plus from the oil furnace. The oil furnace works similarly to the air conditioning system in that it has a network inside of it that also changes the temperature of the air but instead of cold it makes it warm. Rather than being outside like the air conditioning system, the gas furnace can be found either in the basement or attic. The oil furnace regularly will run on gas or oil and will spread the heated air through the home using the same installed air ducts that the air conditioner uses. The thermostat is what controls both the air conditioning system plus the oil furnace. It is the brain of the Heating, Ventilation and air conditioning network. The awesome part is that you get to control the thermostat yourself with the thermometer. If you would like an HVAC system in your home you can easily have it by contacting an HVAC company and scheduling a time to get one installed. Then the Heating, Ventilation and air conditioning specialist will be at your home installing the network for you. HVAC is an investment that will keep you comfortable and help you in more ways than you would think.