Many factors are involved when determining what size of an air conditioner or furnace would have the required power output to cool or heat your home. These factors include the extent of exposure to the sun and the outside air, the thickness and type of outside wall insulation, the size, type and number of windows and outside doors, the ceiling height, etc. Generally speaking, however, if you live in the Greater Toronto Area or Southern Ontario, you may use the following charts to estimate the correct size of the heating or cooling product that you may need for your home. It is very critical in the installation of furnaces and air conditioning systems that you are recommended the right size unit most suitable for your home. Under- or oversizing can cost you performance, comfort and efficiency related issues when it comes to both the furnace and the air conditioner. Undersizing will, of course, result in the unit being unable to meet the desired temperature setting. Aside from the issue of your comfort, undersizing the equipment and/or material will most likely lead to the premature failing of the units.

This being said, it is as important to make certain that the units are not oversized, either. It is rather a quite often observed misconception of consumers that the more powerful the furnace or the air conditioner, the better heating and cooling performance that will be achieved. Oversizing a furnace will result in many different shortcomings. First of all, what is most important in having a uniform distribution of the warm air is the optimum runtime of the furnace. The same statement is also true for an air conditioning unit with respect the uniform distribution of the cool air. When going with a more powerful hvac unit, it will satisfy the temperature setting quicker than when it should and it will not run that optimum length of cycle for you to have a uniform temperature everywhere in your home and the existence of those hot and cold spots in the house is inevitable in that case. With an oversizing of the gas furnace, there also exists a great chance for the overheating of the furnace.

This is mostly caused because in the case of oversizing of a furnace, the existing ducts in the home will not support such high volumes of air flow causing pressure build-up in the return air duct and therefore overheating. Also, do keep in mind that the maximum level of efficiency with the gas consumption of a gas furnace is achieved when the right size furnace is installed in your home. In fact, the right size furnace should almost continuously run during the coldest day of the year. Of course, it should be able to satisfy your desired temperature setpoint. Aside from the non-uniform air distribution, oversizing an air conditioner will lead to uncomfortable and higher humidity levels in your home. As you know, an air conditioner is also meant to dehumidify the air. This is done through the indoor evaporator coil - installed inside the plenum (duct above the furnace) - that removes moisture and water vapour from the airflow passing through. When the air conditioner is oversized, it will stop running sooner than the optimum length of time it needs to run in order to also dehumidify the air.

Another misconception is also the belief that by going with a bigger size furnace or air conditioner, there br will saving on fuel/electricity costs as a result of the units working less, which is certainly not the case. You always require the same amount of energy in order to heat or cool your house. The factor that determines this consumption is not the power rating; it is the efficiency of the unit. When the furnace or A/C is more powerful, it will use more power in a shorter period whereas a smaller size furnace or A/C would end up using the same energy but in the manner of less power in a longer period - which works out to have the same consumption levels. central ac unit capacityIn fact, in the case of an oversized unit, some energy is wasted and the maximum efficiency of the unit would not be achieved.cost of 1 ton ac unit

Keep in mind that the following furnace output power estimates are aside from the furnace's nominal power ratings. For example, a 95% rated efficiency furnace with a power rating of 80,000 BTU/hr has a power output of 0.95 x 80,000 BTU/hr = 76,000 BTU/hr. Again, the following tables are meant to provide estimates and a general understanding and overview of this topic; however in rare occasions and depending on some of the above mentioned conditions in your home, such as having open to above areas, the following may not be very accurate in generalizing your heat gain/loss calculations.carbon monoxide in ac unit/    /    /    /    /    / An electric forced air system is a single heating unit controlled by a single thermostat that supplies heat to the entire house by fan-forced air through duct work. Ducts are often concealed in crawlspaces, attics or walls and deliver heat through

The volume of air within the house is continually cycled through the system by return Electric forced air systems generate heat through high resistance wires called heatingElectricity flowing through the elements generates heat that is distributed throughout your home by a fan or blower which forces air through the elements, and directs the heated air into the ductwork. A single thermostat controls the heating unit which turns the unit On or Off according to the set temperature. When the system turns on, electricity generates heat in the elements and the furnace fan forces air over the elements and distributes the heated air out the ducts and through the registers. Usually, registers have built-in adjustable louvers to control the amount and direction The flow of electricity to the elements stops when the set temperature is reached. The fan shuts off once the unit cools down. The air filter is the most important maintenance item in your electric forced air

system because if clogged, the entire system has to work harder and run longer toReplace or clean the filter monthly during the heating season, and at least every three months during the remainder of the year. not accurately measure the room temperature. This means that although you set the thermostat to 68 it may actually allow the room temperature to climb several degrees higher than your "set point" before shutting the system off. the accuracy of your thermostat, place a thermometer in a central location in theCheck the thermometer reading against the reading on your thermostat. Experiment with the thermostat so you will know where to set it nextRemember, the lower you keep the temperature setting, the lower your energyBrush and vacuum fan blades and the fan enclosure area when replacing or cleaning the filter, and clean registers often with a vacuum or brush. A technician should inspect and service your system annually. A service check should

Create greater system efficiency by sealing the plenum (where the ducts attach to the furnace) and ductwork at all seams and joints. By doing so, you could prevent a 15 - 40 percent loss of delivered air. Going away for a while? If so, programmable thermostats are available to automatically "set back" the temperature while you are gone and while you sleep. also can choose from several different types of air filters that reduce the amount of pollens and mold spores in the air. The cost of operating the system is affected by many variables, for instance: Nevertheless, an example of an annual heating cost for a "typical" 1500 square foot, well-insulated house in Eugene heated by an electric forced air system is about $783 a year for heating only. This example assumes a 70 percent delivery efficiency of the system, and a $.04015 rate per kWh (kilowatt hour.) Some basic steps in trouble shooting your system include: Call your service technician in cases where only cool or cold air is delivered,