Window Air Conditioning Energy Cost and Emissions Calculator
Select the window unit's EER rating and enter its capacity (in Btus) in the second box to see operating costs and pollution impact.
If you know the capacity of the window unit, you can see the difference that a higher efficiency rating (EER) 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

Step 2.

Select EER rating
Step 3.

Enter unit capacity (Btu)

 Step 3

Yearly smog and climate change emissions
Annual operating 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 for Toronto.
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.