What size air conditioner do you need for a 1500 sq ft house? The Heating, Refrigeration and Air Conditioning Institute of Canada (HRAI) suggests that such a home requires approximately 24,000 BTUs per hour or a cooling capacity of 2 tons. It is essential to consult with an experienced HVAC contractor to ensure that you get the appropriate air conditioner size for your home. Keep in mind that using an online air conditioner sizing calculator tool can provide estimates to help you determine the appropriate air conditioner size. It’s still recommended to have a professional contractor assess your home’s layout, insulation, and other factors that might affect cooling requirements. Additionally, they can guide you in selecting an energy-efficient air conditioner that meets your cooling needs while also reducing energy consumption and operating expenses. By investing in a correctly sized and efficient air conditioner, you can enjoy comfortable summers and save money in the long run.