Central Air Conditioning Energy Cost and Emissions Calculator Select your nearest location, central air unit's SEER rating and enter its capacity (in Btus) in the final box to see operating costs and pollution impact. If you know the capacity of the central air unit you need, you can see the difference that a higher efficiency rating (SEER) will make in both dollars saved on your energy bill and polluting emissions. Remember that in selectng an air conditioning unit, sizing the unit properly is critical. Oversize units will only waste energy by running in short inefficient cycles -- they won't keep your home cooler. Always look for Energy Star units to get the best value for money and to reduce emissions. Click here for more information about Energuide and Energy Star. Step 1 Select location or nearest city Select City TorontoOttawa London Windsor North Bay Sudbury Thunder Bay Step 2 Select SEER rating Select SEER 10 11 12 13 14 15 16 17 Step 3 Enter unit capacity (Btu) Step 3 Energy costsu Annual smog and climate change emissions Annual operating cost* perating cost Nitrogen oxides (NOx) Sulphur dioxide (SO2) Equivalent CO2 emissions $ kg kg cars per year *These costs are estimates based on climate factors and average number of cooling days from Natural Resources Canada. Electricity price used is 9.7 cents per kilowatt hour, based on an average electricity rate of 5.5 cents per kWh. Other variable charges (distribution, debt retirement) are based on rates charged by Toronto Hydro. Customers must also pay a $12.43 fixed monthly charge, which is not included in these calculations. For more details, click here.