Whatever the condition might be outside, people can enjoy the comforts of their homes with heating and air conditioning units. But finding the right unit would basically depend on the dimensions of the house, where it is located and of course, the budget.
Heating and conditioning equally work based on the tenet that the movement of heat always starts from an area of higher heat concentration to a lower one. So heaters and furnaces would raise the heat levels in order to make an area warmer whereas the air conditioner would eliminate the heat to make the area cooler. The common factor here is that, in doing this, heating and air conditioning units would utilize energy. Air conditioners would primarily use electricity while the majority of heating systems would make use of fuel oil or gas. Although, there are heating systems is using electricity nowadays. A device called a heat pump can heat and cool air by extracting heated air inside the house during summer and pulling in heat from outside during winter.
Air conditioners remove heat by either radiation or convection. The medium used, like water, air or chemicals are refrigerants. When these mediums will evaporate, it takes up the heat and returns it to the compressor to be cooled again. Common types are the window type air conditioner or the box-type. Another popular style of air conditioner is the central type. This is difficult to install especially if the building was not built for it because of its cumbersome duct system. To install a standard ductwork would be too expensive or too wasteful to install. A ductless central-air approach is now feasible. These systems are prevalent in Asia and Europe where building styles prevent ductwork.
Both heating and air conditioning units use a thermostat, a switch sensitive to heat, to control the amount of heat or cold air being generated. This will respond to any change in the temperature of the room where it is used. Modern thermostats are using solid-state electronics to control the air temperature bi-metallic strips used in older models. These are more accurate and quicker to respond to temperature changes. But the problem is, once the solid-state is damaged, it would indicate a need for replacement.
Many heat and air conditioning systems today in the market have been modified to cater to the needs of the users. Most of these new units are designed to be energy efficient and are eco-friendly. In choosing the right system for use, make sure to have the area assessed so a correctly sized unit will be installed and for it to work efficiently. Remember that a more expensive unit is more cost-effective in the long run. So choose wisely.